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Overview
| Comment: | First complete attempt to generate a working changeset. Still contains bugs. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | sqldiff-changeset |
| Files: | files | file ages | folders |
| SHA1: |
5611fa9bd5b8fd762d16ce9b0853c2e7 |
| User & Date: | drh 2015-04-11 12:07:40 |
Context
|
2015-04-11
| ||
| 13:48 | The --changeset option now appears to be working. (Closed-Leaf check-in: 1a2e2803 user: drh tags: sqldiff-changeset) | |
| 12:07 | First complete attempt to generate a working changeset. Still contains bugs. (check-in: 5611fa9b user: drh tags: sqldiff-changeset) | |
|
2015-04-10
| ||
| 19:41 | Work toward adding the --changeset option to the sqldiff utility program. Changes are incomplete. This is an incremental check-in. (check-in: 463e38d7 user: drh tags: sqldiff-changeset) | |
Changes
Changes to tool/sqldiff.c.
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end_diff_one_table:
strFree(&sql);
sqlite3_free(zId);
namelistFree(az);
namelistFree(az2);
return;
}
/*
** Generate a CHANGESET for all differences from main.zTab to aux.zTab.
*/
static void changeset_one_table(const char *zTab, FILE *out){
sqlite3_stmt *pStmt; /* SQL statment */
char *zId = safeId(zTab); /* Escaped name of the table */
char **azCol = 0; /* List of escaped column names */
int nCol = 0; /* Number of columns */
int *aiFlg = 0; /* 0 if column is not part of PK */
int *aiPk = 0; /* Column numbers for each PK column */
int nPk = 0; /* Number of PRIMARY KEY columns */
Str sql; /* SQL for the diff query */
int i; /* Loop counter */
const char *zSep; /* List separator */
pStmt = db_prepare(
"SELECT A.sql=B.sql FROM main.sqlite_master A, aux.sqlite_master B"
" WHERE A.name=%Q AND B.name=%Q", zTab, zTab
);
if( SQLITE_ROW==sqlite3_step(pStmt) ){
................................................................................
aiPk[i-1] = nCol-1;
}
}
sqlite3_finalize(pStmt);
if( nPk==0 ) goto end_changeset_one_table;
strInit(&sql);
if( nCol>nPk ){
strPrintf(&sql, "SELECT 1"); /* Changes to non-PK columns */
for(i=0; i<nCol; i++) strPrintf(&sql, ", A.%s", azCol[i]);
for(i=0; i<nCol; i++) strPrintf(&sql, ", B.%s", azCol[i]);
strPrintf(&sql,"\n FROM main.%s A, aux.%s B\n", zId, zId);
zSep = " WHERE";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s A.%s=B.%s", zSep, azCol[aiPk[i]], azCol[aiPk[i]]);
zSep = " AND";
................................................................................
for(i=0; i<nCol; i++){
if( aiFlg[i] ) continue;
strPrintf(&sql, "%sA.%s IS NOT B.%s", zSep, azCol[i], azCol[i]);
zSep = " OR\n ";
}
strPrintf(&sql,")\n UNION ALL\n");
}
strPrintf(&sql, "SELECT 2"); /* Deleted rows */
for(i=0; i<nCol; i++) strPrintf(&sql, ", A.%s", azCol[i]);
for(i=0; i<nCol; i++) strPrintf(&sql, ", 0");
strPrintf(&sql, " FROM main.%s A\n", zId);
strPrintf(&sql, " WHERE NOT EXISTS(SELECT 1 FROM aux.%s B\n", zId);
zSep = " WHERE";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s A.%s=B.%s", zSep, azCol[aiPk[i]], azCol[aiPk[i]]);
zSep = " AND";
}
strPrintf(&sql, ")\n UNION ALL\n");
strPrintf(&sql, "SELECT 3"); /* Inserted rows */
for(i=0; i<nCol; i++) strPrintf(&sql, ", 0");
for(i=0; i<nCol; i++) strPrintf(&sql, ", B.%s", azCol[i]);
strPrintf(&sql, " FROM aux.%s B\n", zId);
strPrintf(&sql, " WHERE NOT EXISTS(SELECT 1 FROM main.%s A\n", zId);
zSep = " WHERE";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s A.%s=B.%s", zSep, azCol[aiPk[i]], azCol[aiPk[i]]);
................................................................................
zSep = " ";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s %d", zSep, aiPk[i]+1);
zSep = ",";
}
strPrintf(&sql, ";\n");
printf("for table %s:\n%s\n", zId, sql.z);
strFree(&sql);
end_changeset_one_table:
while( nCol>0 ) sqlite3_free(azCol[--nCol]);
sqlite3_free(azCol);
sqlite3_free(aiPk);
sqlite3_free(zId);
}
|
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end_diff_one_table: strFree(&sql); sqlite3_free(zId); namelistFree(az); namelistFree(az2); return; } /* ** Write a 64-bit signed integer as a varint onto out */ static void putsVarint(FILE *out, sqlite3_uint64 v){ int i, n; unsigned char buf[12], p[12]; if( v & (((sqlite3_uint64)0xff000000)<<32) ){ p[8] = (unsigned char)v; v >>= 8; for(i=7; i>=0; i--){ p[i] = (unsigned char)((v & 0x7f) | 0x80); v >>= 7; } fwrite(p, 8, 1, out); }else{ n = 9; do{ p[n--] = (unsigned char)((v & 0x7f) | 0x80); v >>= 7; }while( v!=0 ); buf[9] &= 0x7f; fwrite(buf+n+1, 9-n, 1, out); } } /* ** Generate a CHANGESET for all differences from main.zTab to aux.zTab. */ static void changeset_one_table(const char *zTab, FILE *out){ sqlite3_stmt *pStmt; /* SQL statment */ char *zId = safeId(zTab); /* Escaped name of the table */ char **azCol = 0; /* List of escaped column names */ int nCol = 0; /* Number of columns */ int *aiFlg = 0; /* 0 if column is not part of PK */ int *aiPk = 0; /* Column numbers for each PK column */ int nPk = 0; /* Number of PRIMARY KEY columns */ Str sql; /* SQL for the diff query */ int i, j; /* Loop counters */ const char *zSep; /* List separator */ pStmt = db_prepare( "SELECT A.sql=B.sql FROM main.sqlite_master A, aux.sqlite_master B" " WHERE A.name=%Q AND B.name=%Q", zTab, zTab ); if( SQLITE_ROW==sqlite3_step(pStmt) ){ ................................................................................ aiPk[i-1] = nCol-1; } } sqlite3_finalize(pStmt); if( nPk==0 ) goto end_changeset_one_table; strInit(&sql); if( nCol>nPk ){ strPrintf(&sql, "SELECT %d", SQLITE_UPDATE); for(i=0; i<nCol; i++) strPrintf(&sql, ", A.%s", azCol[i]); for(i=0; i<nCol; i++) strPrintf(&sql, ", B.%s", azCol[i]); strPrintf(&sql,"\n FROM main.%s A, aux.%s B\n", zId, zId); zSep = " WHERE"; for(i=0; i<nPk; i++){ strPrintf(&sql, "%s A.%s=B.%s", zSep, azCol[aiPk[i]], azCol[aiPk[i]]); zSep = " AND"; ................................................................................ for(i=0; i<nCol; i++){ if( aiFlg[i] ) continue; strPrintf(&sql, "%sA.%s IS NOT B.%s", zSep, azCol[i], azCol[i]); zSep = " OR\n "; } strPrintf(&sql,")\n UNION ALL\n"); } strPrintf(&sql, "SELECT %d", SQLITE_DELETE); for(i=0; i<nCol; i++) strPrintf(&sql, ", A.%s", azCol[i]); for(i=0; i<nCol; i++) strPrintf(&sql, ", 0"); strPrintf(&sql, " FROM main.%s A\n", zId); strPrintf(&sql, " WHERE NOT EXISTS(SELECT 1 FROM aux.%s B\n", zId); zSep = " WHERE"; for(i=0; i<nPk; i++){ strPrintf(&sql, "%s A.%s=B.%s", zSep, azCol[aiPk[i]], azCol[aiPk[i]]); zSep = " AND"; } strPrintf(&sql, ")\n UNION ALL\n"); strPrintf(&sql, "SELECT %d", SQLITE_INSERT); for(i=0; i<nCol; i++) strPrintf(&sql, ", 0"); for(i=0; i<nCol; i++) strPrintf(&sql, ", B.%s", azCol[i]); strPrintf(&sql, " FROM aux.%s B\n", zId); strPrintf(&sql, " WHERE NOT EXISTS(SELECT 1 FROM main.%s A\n", zId); zSep = " WHERE"; for(i=0; i<nPk; i++){ strPrintf(&sql, "%s A.%s=B.%s", zSep, azCol[aiPk[i]], azCol[aiPk[i]]); ................................................................................ zSep = " "; for(i=0; i<nPk; i++){ strPrintf(&sql, "%s %d", zSep, aiPk[i]+1); zSep = ","; } strPrintf(&sql, ";\n"); if( g.fDebug & DEBUG_DIFF_SQL ){ printf("SQL for %s:\n%s\n", zId, sql.z); goto end_changeset_one_table; } putc('T', out); putsVarint(out, (sqlite3_uint64)nCol); for(i=0; i<nCol; i++) putc(aiFlg[i]!=0, out); fwrite(zTab, 1, strlen(zTab), out); putc(0, out); pStmt = db_prepare("%s", sql.z); while( SQLITE_ROW==sqlite3_step(pStmt) ){ int iType = sqlite3_column_int(pStmt,0); int iFirst = iType==SQLITE_INSERT ? nCol+1 : 1; int iLast = iType==SQLITE_DELETE ? nCol+1 : 2*nCol+1; putc(iType, out); putc(0, out); for(i=iFirst; i<=iLast; i++){ int iDType = sqlite3_column_type(pStmt,i); sqlite3_int64 iX; double rX; sqlite3_uint64 uX; putc(iDType, out); switch( iDType ){ case SQLITE_INTEGER: iX = sqlite3_column_int64(pStmt,i); memcpy(&uX, &iX, 8); for(j=56; j>=0; j-=8) putc((uX>>j)&0xff, out); break; case SQLITE_FLOAT: rX = sqlite3_column_int64(pStmt,i); memcpy(&uX, &rX, 8); for(j=56; j>=0; j-=8) putc((uX>>j)&0xff, out); break; case SQLITE_TEXT: iX = sqlite3_column_bytes(pStmt,i); putsVarint(out, (sqlite3_uint64)iX); fwrite(sqlite3_column_text(pStmt,i),1,iX,out); break; case SQLITE_BLOB: iX = sqlite3_column_bytes(pStmt,i); putsVarint(out, (sqlite3_uint64)iX); fwrite(sqlite3_column_blob(pStmt,i),1,iX,out); break; case SQLITE_NULL: break; } } } sqlite3_finalize(pStmt); end_changeset_one_table: while( nCol>0 ) sqlite3_free(azCol[--nCol]); sqlite3_free(azCol); sqlite3_free(aiPk); sqlite3_free(zId); } |