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/* |
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** Copyright (c) 2024 D. Richard Hipp |
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** |
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** This program is free software; you can redistribute it and/or |
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** modify it under the terms of the Simplified BSD License (also |
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** known as the "2-Clause License" or "FreeBSD License".) |
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** |
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** This program is distributed in the hope that it will be useful, |
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** but without any warranty; without even the implied warranty of |
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** merchantability or fitness for a particular purpose. |
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** |
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** Author contact information: |
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** [email protected] |
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** http://www.hwaci.com/drh/ |
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** |
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******************************************************************************* |
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** |
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** This file contains code used to compute a "diff" between two SQLite |
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** database files for display by Fossil. |
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** |
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** Fossil normally only computes diffs on text files. But I was inspired |
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** by a Hacker News post to add support for diffs of other kinds of files |
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** as well. The HN post in question is: |
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** |
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** https://news.ycombinator.com/item?id=42141370 |
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** |
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** eternityforest | on: On Building Git for Lawyers |
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** I really think Git should just add builtin support for binaries, |
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** and diffing for SQLite and .zip. it's not like it would be all |
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** that much code.... |
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** |
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** This file borrows a lot of code from the "sqldiff.c" module of |
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** SQLite. (https://sqlite.org/src/file/tool/sqldiff.c) |
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*/ |
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#include "config.h" |
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#include "sqldiff.h" |
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#include <ctype.h> |
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#if INTERFACE |
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/* |
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** Context for an SQL diff |
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*/ |
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struct SqlDiffCtx { |
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int bSchemaOnly; /* Only show schema differences */ |
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int bSchemaPK; /* Use the schema-defined PK, not the true PK */ |
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int bHandleVtab; /* Handle fts3, fts4, fts5 and rtree vtabs */ |
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unsigned fDebug; /* Debug flags */ |
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int bSchemaCompare; /* Doing single-table sqlite_schema compare */ |
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int nErr; /* Number of errors encountered */ |
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Blob *out; /* Write the diff output here */ |
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sqlite3 *db; /* The database connection */ |
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}; |
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/* |
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** Allowed values for SqlDiffCtx.fDebug |
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*/ |
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#define SQLDIFF_COLUMN_NAMES 0x000001 |
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#define SQLDIFF_DIFF_SQL 0x000002 |
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#define SQLDIFF_SHOW_ERRORS 0x000004 |
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#endif /* INTERFACE */ |
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/* |
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** Return true if the input Blob superficially resembles an SQLite |
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** database file. |
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*/ |
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static int looks_like_sqlite_db(const Blob *pDb){ |
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int sz = blob_size(pDb); |
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const u8 *a = (const u8*)blob_buffer(pDb); |
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static const u8 aSqliteHeader[16] = { |
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0x53, 0x51, 0x4c, 0x69, 0x74, 0x65, 0x20, 0x66, |
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0x6f, 0x72, 0x6d, 0x61, 0x74, 0x20, 0x33, 0x00 |
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}; |
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if( sz<512 ) return 0; |
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if( (sz%512)!=0 ) return 0; |
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if( memcmp(aSqliteHeader,a,16)!=0 ) return 0; |
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return 1; |
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} |
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/* |
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** Clear and free an sqlite3_str object |
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*/ |
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static void strFree(sqlite3_str *pStr){ |
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sqlite3_free(sqlite3_str_finish(pStr)); |
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} |
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/* |
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** Print an error message for an error that occurs at runtime. |
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*/ |
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static void sqldiffError(SqlDiffCtx *p, const char *zFormat, ...){ |
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if( p->fDebug & SQLDIFF_SHOW_ERRORS ){ |
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sqlite3_str *pOut = sqlite3_str_new(0); |
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va_list ap; |
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va_start(ap, zFormat); |
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sqlite3_str_vappendf(pOut, zFormat, ap); |
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va_end(ap); |
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fossil_print("%s\n", sqlite3_str_value(pOut)); |
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strFree(pOut); |
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} |
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p->nErr++; |
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} |
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/* Safely quote an SQL identifier. Use the minimum amount of transformation |
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** necessary to allow the string to be used with %s. |
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** |
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** Space to hold the returned string is obtained from sqlite3_malloc(). The |
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** caller is responsible for ensuring this space is freed when no longer |
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** needed. |
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*/ |
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static char *safeId(const char *zId){ |
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int i, x; |
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char c; |
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if( zId[0]==0 ) return sqlite3_mprintf("\"\""); |
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for(i=x=0; (c = zId[i])!=0; i++){ |
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if( !isalpha(c) && c!='_' ){ |
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if( i>0 && isdigit(c) ){ |
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x++; |
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}else{ |
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return sqlite3_mprintf("\"%w\"", zId); |
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} |
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} |
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} |
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if( x || !sqlite3_keyword_check(zId,i) ){ |
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return sqlite3_mprintf("%s", zId); |
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} |
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return sqlite3_mprintf("\"%w\"", zId); |
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} |
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/* |
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** Prepare a new SQL statement. Print an error and abort if anything |
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** goes wrong. |
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*/ |
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static sqlite3_stmt *sqldiff_vprepare( |
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SqlDiffCtx *p, |
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const char *zFormat, |
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va_list ap |
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){ |
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char *zSql; |
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int rc; |
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sqlite3_stmt *pStmt; |
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zSql = sqlite3_vmprintf(zFormat, ap); |
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if( zSql==0 ) fossil_fatal("out of memory\n"); |
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rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0); |
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if( rc ){ |
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sqldiffError(p, "SQL statement error: %s\n\"%s\"", sqlite3_errmsg(p->db), |
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zSql); |
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sqlite3_finalize(pStmt); |
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pStmt = 0; |
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} |
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sqlite3_free(zSql); |
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return pStmt; |
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} |
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static sqlite3_stmt *sqldiff_prepare(SqlDiffCtx *p, const char *zFormat, ...){ |
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va_list ap; |
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sqlite3_stmt *pStmt; |
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va_start(ap, zFormat); |
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pStmt = sqldiff_vprepare(p, zFormat, ap); |
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va_end(ap); |
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return pStmt; |
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} |
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/* |
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** Free a list of strings |
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*/ |
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static void namelistFree(char **az){ |
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if( az ){ |
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int i; |
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for(i=0; az[i]; i++) sqlite3_free(az[i]); |
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sqlite3_free(az); |
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} |
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} |
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/* |
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** Return a list of column names [a] for the table zDb.zTab. Space to |
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** hold the list is obtained from sqlite3_malloc() and should released |
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** using namelistFree() when no longer needed. |
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** |
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** Primary key columns are listed first, followed by data columns. |
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** The number of columns in the primary key is returned in *pnPkey. |
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** |
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** Normally [a], the "primary key" in the previous sentence is the true |
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** primary key - the rowid or INTEGER PRIMARY KEY for ordinary tables |
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** or the declared PRIMARY KEY for WITHOUT ROWID tables. However, if |
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** the p->bSchemaPK flag is set, then the schema-defined PRIMARY KEY is |
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** used in all cases. In that case, entries that have NULL values in |
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** any of their primary key fields will be excluded from the analysis. |
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** |
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** If the primary key for a table is the rowid but rowid is inaccessible, |
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** then this routine returns a NULL pointer. |
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** |
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** [a. If the lone, named table is "sqlite_schema", "rootpage" column is |
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** omitted and the "type" and "name" columns are made to be the PK.] |
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** |
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** Examples: |
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** CREATE TABLE t1(a INT UNIQUE, b INTEGER, c TEXT, PRIMARY KEY(c)); |
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** *pnPKey = 1; |
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** az = { "rowid", "a", "b", "c", 0 } // Normal case |
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** az = { "c", "a", "b", 0 } // g.bSchemaPK==1 |
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** |
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** CREATE TABLE t2(a INT UNIQUE, b INTEGER, c TEXT, PRIMARY KEY(b)); |
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** *pnPKey = 1; |
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** az = { "b", "a", "c", 0 } |
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** |
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** CREATE TABLE t3(x,y,z,PRIMARY KEY(y,z)); |
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** *pnPKey = 1 // Normal case |
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** az = { "rowid", "x", "y", "z", 0 } // Normal case |
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** *pnPKey = 2 // g.bSchemaPK==1 |
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** az = { "y", "x", "z", 0 } // g.bSchemaPK==1 |
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** |
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** CREATE TABLE t4(x,y,z,PRIMARY KEY(y,z)) WITHOUT ROWID; |
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** *pnPKey = 2 |
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** az = { "y", "z", "x", 0 } |
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** |
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** CREATE TABLE t5(rowid,_rowid_,oid); |
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** az = 0 // The rowid is not accessible |
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*/ |
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static char **columnNames( |
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SqlDiffCtx *p, /* Diffing context */ |
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const char *zDb, /* Database ("aaa" or "bbb") to query */ |
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const char *zTab, /* Name of table to return details of */ |
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int *pnPKey, /* OUT: Number of PK columns */ |
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int *pbRowid /* OUT: True if PK is an implicit rowid */ |
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){ |
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char **az = 0; /* List of column names to be returned */ |
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int naz = 0; /* Number of entries in az[] */ |
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sqlite3_stmt *pStmt; /* SQL statement being run */ |
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char *zPkIdxName = 0; /* Name of the PRIMARY KEY index */ |
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int truePk = 0; /* PRAGMA table_info indentifies the PK to use */ |
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int nPK = 0; /* Number of PRIMARY KEY columns */ |
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int i, j; /* Loop counters */ |
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if( p->bSchemaPK==0 ){ |
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/* Normal case: Figure out what the true primary key is for the table. |
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** * For WITHOUT ROWID tables, the true primary key is the same as |
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** the schema PRIMARY KEY, which is guaranteed to be present. |
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** * For rowid tables with an INTEGER PRIMARY KEY, the true primary |
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** key is the INTEGER PRIMARY KEY. |
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** * For all other rowid tables, the rowid is the true primary key. |
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*/ |
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pStmt = sqldiff_prepare(p, "PRAGMA %s.index_list=%Q", zDb, zTab); |
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while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
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if( sqlite3_stricmp((const char*)sqlite3_column_text(pStmt,3),"pk")==0 ){ |
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zPkIdxName = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 1)); |
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break; |
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} |
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} |
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sqlite3_finalize(pStmt); |
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if( zPkIdxName ){ |
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int nKey = 0; |
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int nCol = 0; |
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truePk = 0; |
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pStmt = sqldiff_prepare(p, "PRAGMA %s.index_xinfo=%Q", zDb, zPkIdxName); |
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while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
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257
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nCol++; |
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if( sqlite3_column_int(pStmt,5) ){ nKey++; continue; } |
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if( sqlite3_column_int(pStmt,1)>=0 ) truePk = 1; |
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} |
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261
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if( nCol==nKey ) truePk = 1; |
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262
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if( truePk ){ |
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263
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nPK = nKey; |
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264
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}else{ |
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265
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nPK = 1; |
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266
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} |
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267
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sqlite3_finalize(pStmt); |
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268
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sqlite3_free(zPkIdxName); |
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269
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}else{ |
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270
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truePk = 1; |
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271
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nPK = 1; |
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272
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} |
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273
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pStmt = sqldiff_prepare(p, "PRAGMA %s.table_info=%Q", zDb, zTab); |
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274
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}else{ |
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275
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/* The p->bSchemaPK==1 case: Use whatever primary key is declared |
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276
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** in the schema. The "rowid" will still be used as the primary key |
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277
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** if the table definition does not contain a PRIMARY KEY. |
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278
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*/ |
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279
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nPK = 0; |
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280
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pStmt = sqldiff_prepare(p, "PRAGMA %s.table_info=%Q", zDb, zTab); |
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281
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while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
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282
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if( sqlite3_column_int(pStmt,5)>0 ) nPK++; |
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283
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} |
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284
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sqlite3_reset(pStmt); |
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285
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if( nPK==0 ) nPK = 1; |
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286
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truePk = 1; |
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287
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} |
|
288
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if( p->bSchemaCompare ){ |
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289
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assert( sqlite3_stricmp(zTab,"sqlite_schema")==0 |
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290
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|| sqlite3_stricmp(zTab,"sqlite_master")==0 ); |
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291
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/* For sqlite_schema, will use type and name as the PK. */ |
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292
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nPK = 2; |
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293
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truePk = 0; |
|
294
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} |
|
295
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*pnPKey = nPK; |
|
296
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naz = nPK; |
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297
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az = sqlite3_malloc( sizeof(char*)*(nPK+1) ); |
|
298
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if( az==0 ) fossil_fatal("out of memory\n"); |
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299
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memset(az, 0, sizeof(char*)*(nPK+1)); |
|
300
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if( p->bSchemaCompare ){ |
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301
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az[0] = sqlite3_mprintf("%s", "type"); |
|
302
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az[1] = sqlite3_mprintf("%s", "name"); |
|
303
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} |
|
304
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while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
305
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char * sid = safeId((char*)sqlite3_column_text(pStmt,1)); |
|
306
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int iPKey; |
|
307
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if( truePk && (iPKey = sqlite3_column_int(pStmt,5))>0 ){ |
|
308
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az[iPKey-1] = sid; |
|
309
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}else{ |
|
310
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if( !p->bSchemaCompare |
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311
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|| !(strcmp(sid,"rootpage")==0 |
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312
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||strcmp(sid,"name")==0 |
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313
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||strcmp(sid,"type")==0)){ |
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314
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az = sqlite3_realloc(az, sizeof(char*)*(naz+2) ); |
|
315
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if( az==0 ) fossil_fatal("out of memory\n"); |
|
316
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az[naz++] = sid; |
|
317
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} |
|
318
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} |
|
319
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} |
|
320
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sqlite3_finalize(pStmt); |
|
321
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if( az ) az[naz] = 0; |
|
322
|
|
|
323
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/* If it is non-NULL, set *pbRowid to indicate whether or not the PK of |
|
324
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** this table is an implicit rowid (*pbRowid==1) or not (*pbRowid==0). */ |
|
325
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if( pbRowid ) *pbRowid = (az[0]==0); |
|
326
|
|
|
327
|
/* If this table has an implicit rowid for a PK, figure out how to refer |
|
328
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** to it. There are usually three options - "rowid", "_rowid_" and "oid". |
|
329
|
** Any of these will work, unless the table has an explicit column of the |
|
330
|
** same name or the sqlite_schema tables are to be compared. In the latter |
|
331
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** case, pretend that the "true" primary key is the name column, which |
|
332
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** avoids extraneous diffs against the schemas due to rowid variance. */ |
|
333
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if( az[0]==0 ){ |
|
334
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const char *azRowid[] = { "rowid", "_rowid_", "oid" }; |
|
335
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for(i=0; i<sizeof(azRowid)/sizeof(azRowid[0]); i++){ |
|
336
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for(j=1; j<naz; j++){ |
|
337
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if( sqlite3_stricmp(az[j], azRowid[i])==0 ) break; |
|
338
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} |
|
339
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if( j>=naz ){ |
|
340
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az[0] = sqlite3_mprintf("%s", azRowid[i]); |
|
341
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break; |
|
342
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} |
|
343
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} |
|
344
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if( az[0]==0 ){ |
|
345
|
for(i=1; i<naz; i++) sqlite3_free(az[i]); |
|
346
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sqlite3_free(az); |
|
347
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az = 0; |
|
348
|
} |
|
349
|
} |
|
350
|
return az; |
|
351
|
} |
|
352
|
|
|
353
|
/* |
|
354
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** Print the sqlite3_value X as an SQL literal. |
|
355
|
*/ |
|
356
|
static void printQuoted(Blob *out, sqlite3_value *X){ |
|
357
|
switch( sqlite3_value_type(X) ){ |
|
358
|
case SQLITE_FLOAT: { |
|
359
|
double r1; |
|
360
|
char zBuf[50]; |
|
361
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r1 = sqlite3_value_double(X); |
|
362
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sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.15g", r1); |
|
363
|
blob_appendf(out, "%s", zBuf); |
|
364
|
break; |
|
365
|
} |
|
366
|
case SQLITE_INTEGER: { |
|
367
|
blob_appendf(out, "%lld", sqlite3_value_int64(X)); |
|
368
|
break; |
|
369
|
} |
|
370
|
case SQLITE_BLOB: { |
|
371
|
const unsigned char *zBlob = sqlite3_value_blob(X); |
|
372
|
int nBlob = sqlite3_value_bytes(X); |
|
373
|
if( zBlob ){ |
|
374
|
int i; |
|
375
|
blob_appendf(out, "x'"); |
|
376
|
for(i=0; i<nBlob; i++){ |
|
377
|
blob_appendf(out, "%02x", zBlob[i]); |
|
378
|
} |
|
379
|
blob_appendf(out, "'"); |
|
380
|
}else{ |
|
381
|
/* Could be an OOM, could be a zero-byte blob */ |
|
382
|
blob_appendf(out, "X''"); |
|
383
|
} |
|
384
|
break; |
|
385
|
} |
|
386
|
case SQLITE_TEXT: { |
|
387
|
const unsigned char *zArg = sqlite3_value_text(X); |
|
388
|
|
|
389
|
if( zArg==0 ){ |
|
390
|
blob_appendf(out, "NULL"); |
|
391
|
}else{ |
|
392
|
int inctl = 0; |
|
393
|
int i, j; |
|
394
|
blob_appendf(out, "'"); |
|
395
|
for(i=j=0; zArg[i]; i++){ |
|
396
|
char c = zArg[i]; |
|
397
|
int ctl = iscntrl((unsigned char)c); |
|
398
|
if( ctl>inctl ){ |
|
399
|
inctl = ctl; |
|
400
|
blob_appendf(out, "%.*s'||X'%02x", i-j, &zArg[j], c); |
|
401
|
j = i+1; |
|
402
|
}else if( ctl ){ |
|
403
|
blob_appendf(out, "%02x", c); |
|
404
|
j = i+1; |
|
405
|
}else{ |
|
406
|
if( inctl ){ |
|
407
|
inctl = 0; |
|
408
|
blob_appendf(out, "'\n||'"); |
|
409
|
} |
|
410
|
if( c=='\'' ){ |
|
411
|
blob_appendf(out, "%.*s'", i-j+1, &zArg[j]); |
|
412
|
j = i+1; |
|
413
|
} |
|
414
|
} |
|
415
|
} |
|
416
|
blob_appendf(out, "%s'", &zArg[j]); |
|
417
|
} |
|
418
|
break; |
|
419
|
} |
|
420
|
case SQLITE_NULL: { |
|
421
|
blob_appendf(out, "NULL"); |
|
422
|
break; |
|
423
|
} |
|
424
|
} |
|
425
|
} |
|
426
|
|
|
427
|
/* |
|
428
|
** Output SQL that will recreate the bbb.zTab table. |
|
429
|
*/ |
|
430
|
static void dump_table(SqlDiffCtx *p, const char *zTab){ |
|
431
|
char *zId = safeId(zTab); /* Name of the table */ |
|
432
|
char **az = 0; /* List of columns */ |
|
433
|
int nPk; /* Number of true primary key columns */ |
|
434
|
int nCol; /* Number of data columns */ |
|
435
|
int i; /* Loop counter */ |
|
436
|
sqlite3_stmt *pStmt; /* SQL statement */ |
|
437
|
const char *zSep; /* Separator string */ |
|
438
|
sqlite3_str *pIns; /* Beginning of the INSERT statement */ |
|
439
|
|
|
440
|
pStmt = sqldiff_prepare(p, |
|
441
|
"SELECT sql FROM bbb.sqlite_schema WHERE name=%Q", zTab); |
|
442
|
if( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
443
|
blob_appendf(p->out, "%s;\n", sqlite3_column_text(pStmt,0)); |
|
444
|
} |
|
445
|
sqlite3_finalize(pStmt); |
|
446
|
if( !p->bSchemaOnly ){ |
|
447
|
az = columnNames(p, "bbb", zTab, &nPk, 0); |
|
448
|
pIns = sqlite3_str_new(0); |
|
449
|
if( az==0 ){ |
|
450
|
pStmt = sqldiff_prepare(p, "SELECT * FROM bbb.%s", zId); |
|
451
|
sqlite3_str_appendf(pIns,"INSERT INTO %s VALUES", zId); |
|
452
|
}else{ |
|
453
|
sqlite3_str *pSql = sqlite3_str_new(0); |
|
454
|
zSep = "SELECT"; |
|
455
|
for(i=0; az[i]; i++){ |
|
456
|
sqlite3_str_appendf(pSql, "%s %s", zSep, az[i]); |
|
457
|
zSep = ","; |
|
458
|
} |
|
459
|
sqlite3_str_appendf(pSql," FROM bbb.%s", zId); |
|
460
|
zSep = " ORDER BY"; |
|
461
|
for(i=1; i<=nPk; i++){ |
|
462
|
sqlite3_str_appendf(pSql, "%s %d", zSep, i); |
|
463
|
zSep = ","; |
|
464
|
} |
|
465
|
pStmt = sqldiff_prepare(p, "%s", sqlite3_str_value(pSql)); |
|
466
|
strFree(pSql); |
|
467
|
sqlite3_str_appendf(pIns, "INSERT INTO %s", zId); |
|
468
|
zSep = "("; |
|
469
|
for(i=0; az[i]; i++){ |
|
470
|
sqlite3_str_appendf(pIns, "%s%s", zSep, az[i]); |
|
471
|
zSep = ","; |
|
472
|
} |
|
473
|
sqlite3_str_appendf(pIns,") VALUES"); |
|
474
|
namelistFree(az); |
|
475
|
} |
|
476
|
nCol = sqlite3_column_count(pStmt); |
|
477
|
while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
478
|
blob_appendf(p->out, "%s",sqlite3_str_value(pIns)); |
|
479
|
zSep = "("; |
|
480
|
for(i=0; i<nCol; i++){ |
|
481
|
blob_appendf(p->out, "%s",zSep); |
|
482
|
printQuoted(p->out, sqlite3_column_value(pStmt,i)); |
|
483
|
zSep = ","; |
|
484
|
} |
|
485
|
blob_appendf(p->out, ");\n"); |
|
486
|
} |
|
487
|
sqlite3_finalize(pStmt); |
|
488
|
strFree(pIns); |
|
489
|
} /* endif !p->bSchemaOnly */ |
|
490
|
pStmt = sqldiff_prepare(p, "SELECT sql FROM bbb.sqlite_schema" |
|
491
|
" WHERE type='index' AND tbl_name=%Q AND sql IS NOT NULL", |
|
492
|
zTab); |
|
493
|
while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
494
|
blob_appendf(p->out, "%s;\n", sqlite3_column_text(pStmt,0)); |
|
495
|
} |
|
496
|
sqlite3_finalize(pStmt); |
|
497
|
sqlite3_free(zId); |
|
498
|
} |
|
499
|
|
|
500
|
|
|
501
|
/* |
|
502
|
** Compute all differences for a single table, except if the |
|
503
|
** table name is sqlite_schema, ignore the rootpage column. |
|
504
|
*/ |
|
505
|
static void diff_one_table(SqlDiffCtx *p, const char *zTab){ |
|
506
|
char *zId = safeId(zTab); /* Name of table (translated for us in SQL) */ |
|
507
|
char **az = 0; /* Columns in aaa */ |
|
508
|
char **az2 = 0; /* Columns in bbb */ |
|
509
|
int nPk; /* Primary key columns in aaa */ |
|
510
|
int nPk2; /* Primary key columns in bbb */ |
|
511
|
int n = 0; /* Number of columns in aaa */ |
|
512
|
int n2; /* Number of columns in bbb */ |
|
513
|
int nQ; /* Number of output columns in the diff query */ |
|
514
|
int i; /* Loop counter */ |
|
515
|
const char *zSep; /* Separator string */ |
|
516
|
sqlite3_str *pSql; /* Comparison query */ |
|
517
|
sqlite3_stmt *pStmt; /* Query statement to do the diff */ |
|
518
|
const char *zLead = /* Becomes line-comment for sqlite_schema */ |
|
519
|
(p->bSchemaCompare)? "-- " : ""; |
|
520
|
|
|
521
|
pSql = sqlite3_str_new(0); |
|
522
|
if( p->fDebug==SQLDIFF_COLUMN_NAMES ){ |
|
523
|
/* Simply run columnNames() on all tables of the origin |
|
524
|
** database and show the results. This is used for testing |
|
525
|
** and debugging of the columnNames() function. |
|
526
|
*/ |
|
527
|
az = columnNames(p, "bbb",zTab, &nPk, 0); |
|
528
|
if( az==0 ){ |
|
529
|
fossil_print("Rowid not accessible for %s\n", zId); |
|
530
|
}else{ |
|
531
|
fossil_print("%s:", zId); |
|
532
|
for(i=0; az[i]; i++){ |
|
533
|
fossil_print(" %s", az[i]); |
|
534
|
if( i+1==nPk ) fossil_print(" *"); |
|
535
|
} |
|
536
|
fossil_print("\n"); |
|
537
|
} |
|
538
|
goto end_diff_one_table; |
|
539
|
} |
|
540
|
|
|
541
|
if( sqlite3_table_column_metadata(p->db,"bbb",zTab,0,0,0,0,0,0) ){ |
|
542
|
if( !sqlite3_table_column_metadata(p->db,"aaa",zTab,0,0,0,0,0,0) ){ |
|
543
|
/* Table missing from second database. */ |
|
544
|
if( p->bSchemaCompare ){ |
|
545
|
blob_appendf(p->out, "-- 2nd DB has no %s table\n", zTab); |
|
546
|
}else{ |
|
547
|
blob_appendf(p->out, "DROP TABLE %s;\n", zId); |
|
548
|
} |
|
549
|
} |
|
550
|
goto end_diff_one_table; |
|
551
|
} |
|
552
|
|
|
553
|
if( sqlite3_table_column_metadata(p->db,"aaa",zTab,0,0,0,0,0,0) ){ |
|
554
|
/* Table missing from source */ |
|
555
|
if( p->bSchemaCompare ){ |
|
556
|
blob_appendf(p->out, "-- 1st DB has no %s table\n", zTab); |
|
557
|
}else{ |
|
558
|
dump_table(p, zTab); |
|
559
|
} |
|
560
|
goto end_diff_one_table; |
|
561
|
} |
|
562
|
|
|
563
|
az = columnNames(p, "aaa", zTab, &nPk, 0); |
|
564
|
az2 = columnNames(p, "bbb", zTab, &nPk2, 0); |
|
565
|
if( az && az2 ){ |
|
566
|
for(n=0; az[n] && az2[n]; n++){ |
|
567
|
if( sqlite3_stricmp(az[n],az2[n])!=0 ) break; |
|
568
|
} |
|
569
|
} |
|
570
|
if( az==0 |
|
571
|
|| az2==0 |
|
572
|
|| nPk!=nPk2 |
|
573
|
|| az[n] |
|
574
|
){ |
|
575
|
/* Schema mismatch */ |
|
576
|
blob_appendf(p->out, "%sDROP TABLE %s; -- due to schema mismatch\n", |
|
577
|
zLead, zId); |
|
578
|
dump_table(p, zTab); |
|
579
|
goto end_diff_one_table; |
|
580
|
} |
|
581
|
|
|
582
|
/* Build the comparison query */ |
|
583
|
for(n2=n; az2[n2]; n2++){ |
|
584
|
char *zNTab = safeId(az2[n2]); |
|
585
|
blob_appendf(p->out, "ALTER TABLE %s ADD COLUMN %s;\n", zId, zNTab); |
|
586
|
sqlite3_free(zNTab); |
|
587
|
} |
|
588
|
nQ = nPk2+1+2*(n2-nPk2); |
|
589
|
if( n2>nPk2 ){ |
|
590
|
zSep = "SELECT "; |
|
591
|
for(i=0; i<nPk; i++){ |
|
592
|
sqlite3_str_appendf(pSql, "%sB.%s", zSep, az[i]); |
|
593
|
zSep = ", "; |
|
594
|
} |
|
595
|
sqlite3_str_appendf(pSql, ", 1 /* changed row */"); |
|
596
|
while( az[i] ){ |
|
597
|
sqlite3_str_appendf(pSql, ", A.%s IS NOT B.%s, B.%s", |
|
598
|
az[i], az2[i], az2[i]); |
|
599
|
i++; |
|
600
|
} |
|
601
|
while( az2[i] ){ |
|
602
|
sqlite3_str_appendf(pSql, ", B.%s IS NOT NULL, B.%s", |
|
603
|
az2[i], az2[i]); |
|
604
|
i++; |
|
605
|
} |
|
606
|
sqlite3_str_appendf(pSql, "\n FROM aaa.%s A, bbb.%s B\n", zId, zId); |
|
607
|
zSep = " WHERE"; |
|
608
|
for(i=0; i<nPk; i++){ |
|
609
|
sqlite3_str_appendf(pSql, "%s A.%s=B.%s", zSep, az[i], az[i]); |
|
610
|
zSep = " AND"; |
|
611
|
} |
|
612
|
zSep = "\n AND ("; |
|
613
|
while( az[i] ){ |
|
614
|
sqlite3_str_appendf(pSql, "%sA.%s IS NOT B.%s%s\n", |
|
615
|
zSep, az[i], az2[i], az2[i+1]==0 ? ")" : ""); |
|
616
|
zSep = " OR "; |
|
617
|
i++; |
|
618
|
} |
|
619
|
while( az2[i] ){ |
|
620
|
sqlite3_str_appendf(pSql, "%sB.%s IS NOT NULL%s\n", |
|
621
|
zSep, az2[i], az2[i+1]==0 ? ")" : ""); |
|
622
|
zSep = " OR "; |
|
623
|
i++; |
|
624
|
} |
|
625
|
sqlite3_str_appendf(pSql, " UNION ALL\n"); |
|
626
|
} |
|
627
|
zSep = "SELECT "; |
|
628
|
for(i=0; i<nPk; i++){ |
|
629
|
sqlite3_str_appendf(pSql, "%sA.%s", zSep, az[i]); |
|
630
|
zSep = ", "; |
|
631
|
} |
|
632
|
sqlite3_str_appendf(pSql, ", 2 /* deleted row */"); |
|
633
|
while( az2[i] ){ |
|
634
|
sqlite3_str_appendf(pSql, ", NULL, NULL"); |
|
635
|
i++; |
|
636
|
} |
|
637
|
sqlite3_str_appendf(pSql, "\n FROM aaa.%s A\n", zId); |
|
638
|
sqlite3_str_appendf(pSql, " WHERE NOT EXISTS(SELECT 1 FROM bbb.%s B\n", zId); |
|
639
|
zSep = " WHERE"; |
|
640
|
for(i=0; i<nPk; i++){ |
|
641
|
sqlite3_str_appendf(pSql, "%s A.%s=B.%s", zSep, az[i], az[i]); |
|
642
|
zSep = " AND"; |
|
643
|
} |
|
644
|
sqlite3_str_appendf(pSql, ")\n"); |
|
645
|
zSep = " UNION ALL\nSELECT "; |
|
646
|
for(i=0; i<nPk; i++){ |
|
647
|
sqlite3_str_appendf(pSql, "%sB.%s", zSep, az[i]); |
|
648
|
zSep = ", "; |
|
649
|
} |
|
650
|
sqlite3_str_appendf(pSql, ", 3 /* inserted row */"); |
|
651
|
while( az2[i] ){ |
|
652
|
sqlite3_str_appendf(pSql, ", 1, B.%s", az2[i]); |
|
653
|
i++; |
|
654
|
} |
|
655
|
sqlite3_str_appendf(pSql, "\n FROM bbb.%s B\n", zId); |
|
656
|
sqlite3_str_appendf(pSql, " WHERE NOT EXISTS(SELECT 1 FROM aaa.%s A\n", zId); |
|
657
|
zSep = " WHERE"; |
|
658
|
for(i=0; i<nPk; i++){ |
|
659
|
sqlite3_str_appendf(pSql, "%s A.%s=B.%s", zSep, az[i], az[i]); |
|
660
|
zSep = " AND"; |
|
661
|
} |
|
662
|
sqlite3_str_appendf(pSql, ")\n ORDER BY"); |
|
663
|
zSep = " "; |
|
664
|
for(i=1; i<=nPk; i++){ |
|
665
|
sqlite3_str_appendf(pSql, "%s%d", zSep, i); |
|
666
|
zSep = ", "; |
|
667
|
} |
|
668
|
sqlite3_str_appendf(pSql, ";\n"); |
|
669
|
|
|
670
|
if( p->fDebug & SQLDIFF_DIFF_SQL ){ |
|
671
|
fossil_print("SQL for %s:\n%s\n", zId, sqlite3_str_value(pSql)); |
|
672
|
goto end_diff_one_table; |
|
673
|
} |
|
674
|
|
|
675
|
/* Drop indexes that are missing in the destination */ |
|
676
|
pStmt = sqldiff_prepare(p, |
|
677
|
"SELECT name FROM aaa.sqlite_schema" |
|
678
|
" WHERE type='index' AND tbl_name=%Q" |
|
679
|
" AND sql IS NOT NULL" |
|
680
|
" AND sql NOT IN (SELECT sql FROM bbb.sqlite_schema" |
|
681
|
" WHERE type='index' AND tbl_name=%Q" |
|
682
|
" AND sql IS NOT NULL)", |
|
683
|
zTab, zTab); |
|
684
|
while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
685
|
char *z = safeId((const char*)sqlite3_column_text(pStmt,0)); |
|
686
|
blob_appendf(p->out, "DROP INDEX %s;\n", z); |
|
687
|
sqlite3_free(z); |
|
688
|
} |
|
689
|
sqlite3_finalize(pStmt); |
|
690
|
|
|
691
|
/* Run the query and output differences */ |
|
692
|
if( !p->bSchemaOnly ){ |
|
693
|
pStmt = sqldiff_prepare(p, "%s", sqlite3_str_value(pSql)); |
|
694
|
while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
695
|
int iType = sqlite3_column_int(pStmt, nPk); |
|
696
|
if( iType==1 || iType==2 ){ |
|
697
|
if( iType==1 ){ /* Change the content of a row */ |
|
698
|
blob_appendf(p->out, "%sUPDATE %s", zLead, zId); |
|
699
|
zSep = " SET"; |
|
700
|
for(i=nPk+1; i<nQ; i+=2){ |
|
701
|
if( sqlite3_column_int(pStmt,i)==0 ) continue; |
|
702
|
blob_appendf(p->out, "%s %s=", zSep, az2[(i+nPk-1)/2]); |
|
703
|
zSep = ","; |
|
704
|
printQuoted(p->out, sqlite3_column_value(pStmt,i+1)); |
|
705
|
} |
|
706
|
}else{ /* Delete a row */ |
|
707
|
blob_appendf(p->out, "%sDELETE FROM %s", zLead, zId); |
|
708
|
} |
|
709
|
zSep = " WHERE"; |
|
710
|
for(i=0; i<nPk; i++){ |
|
711
|
blob_appendf(p->out, "%s %s=", zSep, az2[i]); |
|
712
|
printQuoted(p->out, sqlite3_column_value(pStmt,i)); |
|
713
|
zSep = " AND"; |
|
714
|
} |
|
715
|
blob_appendf(p->out, ";\n"); |
|
716
|
}else{ /* Insert a row */ |
|
717
|
blob_appendf(p->out, "%sINSERT INTO %s(%s", zLead, zId, az2[0]); |
|
718
|
for(i=1; az2[i]; i++) blob_appendf(p->out, ",%s", az2[i]); |
|
719
|
blob_appendf(p->out, ") VALUES"); |
|
720
|
zSep = "("; |
|
721
|
for(i=0; i<nPk2; i++){ |
|
722
|
blob_appendf(p->out, "%s", zSep); |
|
723
|
zSep = ","; |
|
724
|
printQuoted(p->out, sqlite3_column_value(pStmt,i)); |
|
725
|
} |
|
726
|
for(i=nPk2+2; i<nQ; i+=2){ |
|
727
|
blob_appendf(p->out, ","); |
|
728
|
printQuoted(p->out, sqlite3_column_value(pStmt,i)); |
|
729
|
} |
|
730
|
blob_appendf(p->out, ");\n"); |
|
731
|
} |
|
732
|
} |
|
733
|
sqlite3_finalize(pStmt); |
|
734
|
} /* endif !p->bSchemaOnly */ |
|
735
|
|
|
736
|
/* Create indexes that are missing in the source */ |
|
737
|
pStmt = sqldiff_prepare(p, |
|
738
|
"SELECT sql FROM bbb.sqlite_schema" |
|
739
|
" WHERE type='index' AND tbl_name=%Q" |
|
740
|
" AND sql IS NOT NULL" |
|
741
|
" AND sql NOT IN (SELECT sql FROM aaa.sqlite_schema" |
|
742
|
" WHERE type='index' AND tbl_name=%Q" |
|
743
|
" AND sql IS NOT NULL)", |
|
744
|
zTab, zTab); |
|
745
|
while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
746
|
blob_appendf(p->out, "%s;\n", sqlite3_column_text(pStmt,0)); |
|
747
|
} |
|
748
|
sqlite3_finalize(pStmt); |
|
749
|
|
|
750
|
end_diff_one_table: |
|
751
|
strFree(pSql); |
|
752
|
sqlite3_free(zId); |
|
753
|
namelistFree(az); |
|
754
|
namelistFree(az2); |
|
755
|
return; |
|
756
|
} |
|
757
|
|
|
758
|
#if 0 |
|
759
|
/* |
|
760
|
** Check that table zTab exists and has the same schema in both the "aaa" |
|
761
|
** and "bbb" databases currently opened by the global db handle. If they |
|
762
|
** do not, output an error message on stderr and exit(1). Otherwise, if |
|
763
|
** the schemas do match, return control to the caller. |
|
764
|
*/ |
|
765
|
static void checkSchemasMatch(SqlDiffCtx *p, const char *zTab){ |
|
766
|
sqlite3_stmt *pStmt = sqldiff_prepare(p, |
|
767
|
"SELECT A.sql=B.sql FROM aaa.sqlite_schema A, bbb.sqlite_schema B" |
|
768
|
" WHERE A.name=%Q AND B.name=%Q", zTab, zTab |
|
769
|
); |
|
770
|
if( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
771
|
if( sqlite3_column_int(pStmt,0)==0 ){ |
|
772
|
sqldiffError(p, "schema changes for table %s", safeId(zTab)); |
|
773
|
} |
|
774
|
}else{ |
|
775
|
sqldiffError(p, "table %s missing from one or both databases",safeId(zTab)); |
|
776
|
} |
|
777
|
sqlite3_finalize(pStmt); |
|
778
|
} |
|
779
|
#endif |
|
780
|
|
|
781
|
/* |
|
782
|
** Return true if the ascii character passed as the only argument is a |
|
783
|
** whitespace character. Otherwise return false. |
|
784
|
*/ |
|
785
|
static int is_whitespace(char x){ |
|
786
|
return (x==' ' || x=='\t' || x=='\n' || x=='\r'); |
|
787
|
} |
|
788
|
|
|
789
|
/* |
|
790
|
** Extract the next SQL keyword or quoted string from buffer zIn and copy it |
|
791
|
** (or a prefix of it if it will not fit) into buffer zBuf, size nBuf bytes. |
|
792
|
** Return a pointer to the character within zIn immediately following |
|
793
|
** the token or quoted string just extracted. |
|
794
|
*/ |
|
795
|
static const char *gobble_token(const char *zIn, char *zBuf, int nBuf){ |
|
796
|
const char *p = zIn; |
|
797
|
char *pOut = zBuf; |
|
798
|
char *pEnd = &pOut[nBuf-1]; |
|
799
|
char q = 0; /* quote character, if any */ |
|
800
|
|
|
801
|
if( p==0 ) return 0; |
|
802
|
while( is_whitespace(*p) ) p++; |
|
803
|
switch( *p ){ |
|
804
|
case '"': q = '"'; break; |
|
805
|
case '\'': q = '\''; break; |
|
806
|
case '`': q = '`'; break; |
|
807
|
case '[': q = ']'; break; |
|
808
|
} |
|
809
|
|
|
810
|
if( q ){ |
|
811
|
p++; |
|
812
|
while( *p && pOut<pEnd ){ |
|
813
|
if( *p==q ){ |
|
814
|
p++; |
|
815
|
if( *p!=q ) break; |
|
816
|
} |
|
817
|
if( pOut<pEnd ) *pOut++ = *p; |
|
818
|
p++; |
|
819
|
} |
|
820
|
}else{ |
|
821
|
while( *p && !is_whitespace(*p) && *p!='(' ){ |
|
822
|
if( pOut<pEnd ) *pOut++ = *p; |
|
823
|
p++; |
|
824
|
} |
|
825
|
} |
|
826
|
|
|
827
|
*pOut = '\0'; |
|
828
|
return p; |
|
829
|
} |
|
830
|
|
|
831
|
/* |
|
832
|
** This function is the implementation of SQL scalar function "module_name": |
|
833
|
** |
|
834
|
** module_name(SQL) |
|
835
|
** |
|
836
|
** The only argument should be an SQL statement of the type that may appear |
|
837
|
** in the sqlite_schema table. If the statement is a "CREATE VIRTUAL TABLE" |
|
838
|
** statement, then the value returned is the name of the module that it |
|
839
|
** uses. Otherwise, if the statement is not a CVT, NULL is returned. |
|
840
|
*/ |
|
841
|
static void module_name_func( |
|
842
|
sqlite3_context *pCtx, |
|
843
|
int nVal, sqlite3_value **apVal |
|
844
|
){ |
|
845
|
const char *zSql; |
|
846
|
char zToken[32]; |
|
847
|
|
|
848
|
assert( nVal==1 ); |
|
849
|
zSql = (const char*)sqlite3_value_text(apVal[0]); |
|
850
|
|
|
851
|
zSql = gobble_token(zSql, zToken, sizeof(zToken)); |
|
852
|
if( zSql==0 || sqlite3_stricmp(zToken, "create") ) return; |
|
853
|
zSql = gobble_token(zSql, zToken, sizeof(zToken)); |
|
854
|
if( zSql==0 || sqlite3_stricmp(zToken, "virtual") ) return; |
|
855
|
zSql = gobble_token(zSql, zToken, sizeof(zToken)); |
|
856
|
if( zSql==0 || sqlite3_stricmp(zToken, "table") ) return; |
|
857
|
zSql = gobble_token(zSql, zToken, sizeof(zToken)); |
|
858
|
if( zSql==0 ) return; |
|
859
|
zSql = gobble_token(zSql, zToken, sizeof(zToken)); |
|
860
|
if( zSql==0 || sqlite3_stricmp(zToken, "using") ) return; |
|
861
|
zSql = gobble_token(zSql, zToken, sizeof(zToken)); |
|
862
|
|
|
863
|
sqlite3_result_text(pCtx, zToken, -1, SQLITE_TRANSIENT); |
|
864
|
} |
|
865
|
|
|
866
|
/* |
|
867
|
** Return the text of an SQL statement that itself returns the list of |
|
868
|
** tables to process within the database. |
|
869
|
*/ |
|
870
|
const char *all_tables_sql(SqlDiffCtx *p){ |
|
871
|
if( p->bHandleVtab ){ |
|
872
|
int rc; |
|
873
|
|
|
874
|
rc = sqlite3_exec(p->db, |
|
875
|
"CREATE TEMP TABLE tblmap(module COLLATE nocase, postfix);" |
|
876
|
"INSERT INTO temp.tblmap VALUES" |
|
877
|
"('fts3', '_content'), ('fts3', '_segments'), ('fts3', '_segdir')," |
|
878
|
|
|
879
|
"('fts4', '_content'), ('fts4', '_segments'), ('fts4', '_segdir')," |
|
880
|
"('fts4', '_docsize'), ('fts4', '_stat')," |
|
881
|
|
|
882
|
"('fts5', '_data'), ('fts5', '_idx'), ('fts5', '_content')," |
|
883
|
"('fts5', '_docsize'), ('fts5', '_config')," |
|
884
|
|
|
885
|
"('rtree', '_node'), ('rtree', '_rowid'), ('rtree', '_parent');" |
|
886
|
, 0, 0, 0 |
|
887
|
); |
|
888
|
assert( rc==SQLITE_OK ); |
|
889
|
|
|
890
|
rc = sqlite3_create_function( |
|
891
|
p->db, "module_name", 1, SQLITE_UTF8, 0, module_name_func, 0, 0 |
|
892
|
); |
|
893
|
assert( rc==SQLITE_OK ); |
|
894
|
|
|
895
|
return |
|
896
|
"SELECT name FROM aaa.sqlite_schema\n" |
|
897
|
" WHERE type='table' AND (\n" |
|
898
|
" module_name(sql) IS NULL OR \n" |
|
899
|
" module_name(sql) IN (SELECT module FROM temp.tblmap)\n" |
|
900
|
" ) AND name NOT IN (\n" |
|
901
|
" SELECT a.name || b.postfix \n" |
|
902
|
"FROM aaa.sqlite_schema AS a, temp.tblmap AS b \n" |
|
903
|
"WHERE module_name(a.sql) = b.module\n" |
|
904
|
" )\n" |
|
905
|
"UNION \n" |
|
906
|
"SELECT name FROM bbb.sqlite_schema\n" |
|
907
|
" WHERE type='table' AND (\n" |
|
908
|
" module_name(sql) IS NULL OR \n" |
|
909
|
" module_name(sql) IN (SELECT module FROM temp.tblmap)\n" |
|
910
|
" ) AND name NOT IN (\n" |
|
911
|
" SELECT a.name || b.postfix \n" |
|
912
|
"FROM bbb.sqlite_schema AS a, temp.tblmap AS b \n" |
|
913
|
"WHERE module_name(a.sql) = b.module\n" |
|
914
|
" )\n" |
|
915
|
" ORDER BY name"; |
|
916
|
}else{ |
|
917
|
return |
|
918
|
"SELECT name FROM aaa.sqlite_schema\n" |
|
919
|
" WHERE type='table' AND sql NOT LIKE 'CREATE VIRTUAL%%'\n" |
|
920
|
" UNION\n" |
|
921
|
"SELECT name FROM bbb.sqlite_schema\n" |
|
922
|
" WHERE type='table' AND sql NOT LIKE 'CREATE VIRTUAL%%'\n" |
|
923
|
" ORDER BY name"; |
|
924
|
} |
|
925
|
} |
|
926
|
|
|
927
|
/* |
|
928
|
** Check to see if the two input blobs, pA and pB, are both |
|
929
|
** SQLite database files. If they are, then output an SQL diff |
|
930
|
** into pOut and return true. If either of the inputs is not |
|
931
|
** a well-formed SQLite database, then return 0. |
|
932
|
** |
|
933
|
** A semantic-level diff is computed. In other words, it is the |
|
934
|
** content of the database that matters. If the databases have |
|
935
|
** different page sizes or text representations or if the pages |
|
936
|
** are in a different order, that does not affect the output. |
|
937
|
** Only content differences are shown. |
|
938
|
*/ |
|
939
|
int sqldiff( |
|
940
|
Blob *pA, /* FROM file */ |
|
941
|
Blob *pB, /* TO file */ |
|
942
|
Blob *pOut, /* Write diff here */ |
|
943
|
DiffConfig *pCfg /* Configuration options */ |
|
944
|
){ |
|
945
|
SqlDiffCtx s; |
|
946
|
sqlite3_stmt *pStmt; |
|
947
|
int rc; |
|
948
|
u8 *aA, *aB; |
|
949
|
int szA, szB; |
|
950
|
u8 aModeA[2]; |
|
951
|
u8 aModeB[2]; |
|
952
|
|
|
953
|
if( pOut==0 ) return 0; |
|
954
|
if( !looks_like_sqlite_db(pA) ) return 0; |
|
955
|
if( !looks_like_sqlite_db(pB) ) return 0; |
|
956
|
memset(&s, 0, sizeof(s)); |
|
957
|
s.out = pOut; |
|
958
|
rc = sqlite3_open(":memory:", &s.db); |
|
959
|
if( rc ){ |
|
960
|
fossil_fatal("Unable to open an auxiliary in-memory database\n"); |
|
961
|
} |
|
962
|
rc = sqlite3_exec(s.db, "ATTACH ':memory:' AS aaa;", 0, 0, 0); |
|
963
|
if( rc ){ |
|
964
|
fossil_fatal("Unable to attach an in-memory database\n"); |
|
965
|
} |
|
966
|
rc = sqlite3_exec(s.db, "ATTACH ':memory:' AS bbb;", 0, 0, 0); |
|
967
|
if( rc ){ |
|
968
|
fossil_fatal("Unable to attach an in-memory database\n"); |
|
969
|
} |
|
970
|
aA = (u8*)blob_buffer(pA); |
|
971
|
szA = blob_size(pA); |
|
972
|
memcpy(aModeA, &aA[18], 2); |
|
973
|
aA[18] = aA[19] = 1; |
|
974
|
aB = (u8*)blob_buffer(pB); |
|
975
|
szB = blob_size(pB); |
|
976
|
memcpy(aModeB, &aB[18], 2); |
|
977
|
aB[18] = aB[19] = 1; |
|
978
|
rc = sqlite3_deserialize(s.db, "aaa", aA, szA, szA, |
|
979
|
SQLITE_DESERIALIZE_READONLY); |
|
980
|
if( rc ){ |
|
981
|
s.nErr++; |
|
982
|
goto not_a_valid_diff; |
|
983
|
} |
|
984
|
rc = sqlite3_deserialize(s.db, "bbb", aB, szB, szB, |
|
985
|
SQLITE_DESERIALIZE_READONLY); |
|
986
|
if( rc ){ |
|
987
|
s.nErr++; |
|
988
|
goto not_a_valid_diff; |
|
989
|
} |
|
990
|
if( pCfg->diffFlags & DIFF_HTML ) blob_appendf(pOut, "<pre>\n"); |
|
991
|
pStmt = sqldiff_prepare(&s, "%s", all_tables_sql(&s) ); |
|
992
|
if( pStmt ){ |
|
993
|
while( SQLITE_ROW==sqlite3_step(pStmt) ){ |
|
994
|
diff_one_table(&s, (const char*)sqlite3_column_text(pStmt,0)); |
|
995
|
} |
|
996
|
sqlite3_finalize(pStmt); |
|
997
|
} |
|
998
|
if( pCfg->diffFlags & DIFF_HTML ) blob_appendf(pOut, "</pre>\n"); |
|
999
|
|
|
1000
|
not_a_valid_diff: |
|
1001
|
sqlite3_close(s.db); |
|
1002
|
if( s.nErr ) blob_reset(pOut); |
|
1003
|
memcpy(&aA[18], aModeA, 2); |
|
1004
|
memcpy(&aB[18], aModeB, 2); |
|
1005
|
return s.nErr==0; |
|
1006
|
} |
|
1007
|
|