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-rw-r--r--kopete/plugins/statistics/sqlite/update.c450
1 files changed, 0 insertions, 450 deletions
diff --git a/kopete/plugins/statistics/sqlite/update.c b/kopete/plugins/statistics/sqlite/update.c
deleted file mode 100644
index 08c7987c..00000000
--- a/kopete/plugins/statistics/sqlite/update.c
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@@ -1,450 +0,0 @@
-/*
-** 2001 September 15
-**
-** The author disclaims copyright to this source code. In place of
-** a legal notice, here is a blessing:
-**
-** May you do good and not evil.
-** May you find forgiveness for yourself and forgive others.
-** May you share freely, never taking more than you give.
-**
-*************************************************************************
-** This file contains C code routines that are called by the parser
-** to handle UPDATE statements.
-**
-** $Id$
-*/
-#include "sqliteInt.h"
-
-/*
-** Process an UPDATE statement.
-**
-** UPDATE OR IGNORE table_wxyz SET a=b, c=d WHERE e<5 AND f NOT NULL;
-** \_______/ \________/ \______/ \________________/
-* onError pTabList pChanges pWhere
-*/
-void sqlite3Update(
- Parse *pParse, /* The parser context */
- SrcList *pTabList, /* The table in which we should change things */
- ExprList *pChanges, /* Things to be changed */
- Expr *pWhere, /* The WHERE clause. May be null */
- int onError /* How to handle constraint errors */
-){
- int i, j; /* Loop counters */
- Table *pTab; /* The table to be updated */
- int addr = 0; /* VDBE instruction address of the start of the loop */
- WhereInfo *pWInfo; /* Information about the WHERE clause */
- Vdbe *v; /* The virtual database engine */
- Index *pIdx; /* For looping over indices */
- int nIdx; /* Number of indices that need updating */
- int nIdxTotal; /* Total number of indices */
- int iCur; /* VDBE Cursor number of pTab */
- sqlite3 *db; /* The database structure */
- Index **apIdx = 0; /* An array of indices that need updating too */
- char *aIdxUsed = 0; /* aIdxUsed[i]==1 if the i-th index is used */
- int *aXRef = 0; /* aXRef[i] is the index in pChanges->a[] of the
- ** an expression for the i-th column of the table.
- ** aXRef[i]==-1 if the i-th column is not changed. */
- int chngRecno; /* True if the record number is being changed */
- Expr *pRecnoExpr = 0; /* Expression defining the new record number */
- int openAll = 0; /* True if all indices need to be opened */
- int isView; /* Trying to update a view */
- AuthContext sContext; /* The authorization context */
-
- int before_triggers; /* True if there are any BEFORE triggers */
- int after_triggers; /* True if there are any AFTER triggers */
- int row_triggers_exist = 0; /* True if any row triggers exist */
-
- int newIdx = -1; /* index of trigger "new" temp table */
- int oldIdx = -1; /* index of trigger "old" temp table */
-
- sContext.pParse = 0;
- if( pParse->nErr || sqlite3_malloc_failed ) goto update_cleanup;
- db = pParse->db;
- assert( pTabList->nSrc==1 );
-
- /* Locate the table which we want to update.
- */
- pTab = sqlite3SrcListLookup(pParse, pTabList);
- if( pTab==0 ) goto update_cleanup;
- before_triggers = sqlite3TriggersExist(pParse, pTab->pTrigger,
- TK_UPDATE, TK_BEFORE, TK_ROW, pChanges);
- after_triggers = sqlite3TriggersExist(pParse, pTab->pTrigger,
- TK_UPDATE, TK_AFTER, TK_ROW, pChanges);
- row_triggers_exist = before_triggers || after_triggers;
- isView = pTab->pSelect!=0;
- if( sqlite3IsReadOnly(pParse, pTab, before_triggers) ){
- goto update_cleanup;
- }
- if( isView ){
- if( sqlite3ViewGetColumnNames(pParse, pTab) ){
- goto update_cleanup;
- }
- }
- aXRef = sqliteMallocRaw( sizeof(int) * pTab->nCol );
- if( aXRef==0 ) goto update_cleanup;
- for(i=0; i<pTab->nCol; i++) aXRef[i] = -1;
-
- /* If there are FOR EACH ROW triggers, allocate cursors for the
- ** special OLD and NEW tables
- */
- if( row_triggers_exist ){
- newIdx = pParse->nTab++;
- oldIdx = pParse->nTab++;
- }
-
- /* Allocate a cursors for the main database table and for all indices.
- ** The index cursors might not be used, but if they are used they
- ** need to occur right after the database cursor. So go ahead and
- ** allocate enough space, just in case.
- */
- pTabList->a[0].iCursor = iCur = pParse->nTab++;
- for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
- pParse->nTab++;
- }
-
- /* Resolve the column names in all the expressions of the
- ** of the UPDATE statement. Also find the column index
- ** for each column to be updated in the pChanges array. For each
- ** column to be updated, make sure we have authorization to change
- ** that column.
- */
- chngRecno = 0;
- for(i=0; i<pChanges->nExpr; i++){
- if( sqlite3ExprResolveAndCheck(pParse, pTabList, 0,
- pChanges->a[i].pExpr, 0, 0) ){
- goto update_cleanup;
- }
- for(j=0; j<pTab->nCol; j++){
- if( sqlite3StrICmp(pTab->aCol[j].zName, pChanges->a[i].zName)==0 ){
- if( j==pTab->iPKey ){
- chngRecno = 1;
- pRecnoExpr = pChanges->a[i].pExpr;
- }
- aXRef[j] = i;
- break;
- }
- }
- if( j>=pTab->nCol ){
- if( sqlite3IsRowid(pChanges->a[i].zName) ){
- chngRecno = 1;
- pRecnoExpr = pChanges->a[i].pExpr;
- }else{
- sqlite3ErrorMsg(pParse, "no such column: %s", pChanges->a[i].zName);
- goto update_cleanup;
- }
- }
-#ifndef SQLITE_OMIT_AUTHORIZATION
- {
- int rc;
- rc = sqlite3AuthCheck(pParse, SQLITE_UPDATE, pTab->zName,
- pTab->aCol[j].zName, db->aDb[pTab->iDb].zName);
- if( rc==SQLITE_DENY ){
- goto update_cleanup;
- }else if( rc==SQLITE_IGNORE ){
- aXRef[j] = -1;
- }
- }
-#endif
- }
-
- /* Allocate memory for the array apIdx[] and fill it with pointers to every
- ** index that needs to be updated. Indices only need updating if their
- ** key includes one of the columns named in pChanges or if the record
- ** number of the original table entry is changing.
- */
- for(nIdx=nIdxTotal=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdxTotal++){
- if( chngRecno ){
- i = 0;
- }else {
- for(i=0; i<pIdx->nColumn; i++){
- if( aXRef[pIdx->aiColumn[i]]>=0 ) break;
- }
- }
- if( i<pIdx->nColumn ) nIdx++;
- }
- if( nIdxTotal>0 ){
- apIdx = sqliteMallocRaw( sizeof(Index*) * nIdx + nIdxTotal );
- if( apIdx==0 ) goto update_cleanup;
- aIdxUsed = (char*)&apIdx[nIdx];
- }
- for(nIdx=j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
- if( chngRecno ){
- i = 0;
- }else{
- for(i=0; i<pIdx->nColumn; i++){
- if( aXRef[pIdx->aiColumn[i]]>=0 ) break;
- }
- }
- if( i<pIdx->nColumn ){
- if( sqlite3CheckIndexCollSeq(pParse, pIdx) ) goto update_cleanup;
- apIdx[nIdx++] = pIdx;
- aIdxUsed[j] = 1;
- }else{
- aIdxUsed[j] = 0;
- }
- }
-
- /* Resolve the column names in all the expressions in the
- ** WHERE clause.
- */
- if( sqlite3ExprResolveAndCheck(pParse, pTabList, 0, pWhere, 0, 0) ){
- goto update_cleanup;
- }
-
- /* Start the view context
- */
- if( isView ){
- sqlite3AuthContextPush(pParse, &sContext, pTab->zName);
- }
-
- /* Begin generating code.
- */
- v = sqlite3GetVdbe(pParse);
- if( v==0 ) goto update_cleanup;
- sqlite3VdbeCountChanges(v);
- sqlite3BeginWriteOperation(pParse, 1, pTab->iDb);
-
- /* If we are trying to update a view, construct that view into
- ** a temporary table.
- */
- if( isView ){
- Select *pView;
- pView = sqlite3SelectDup(pTab->pSelect);
- sqlite3Select(pParse, pView, SRT_TempTable, iCur, 0, 0, 0, 0);
- sqlite3SelectDelete(pView);
- }
-
- /* Begin the database scan
- */
- pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 1, 0);
- if( pWInfo==0 ) goto update_cleanup;
-
- /* Remember the index of every item to be updated.
- */
- sqlite3VdbeAddOp(v, OP_ListWrite, 0, 0);
-
- /* End the database scan loop.
- */
- sqlite3WhereEnd(pWInfo);
-
- /* Initialize the count of updated rows
- */
- if( db->flags & SQLITE_CountRows && !pParse->trigStack ){
- sqlite3VdbeAddOp(v, OP_Integer, 0, 0);
- }
-
- if( row_triggers_exist ){
- /* Create pseudo-tables for NEW and OLD
- */
- sqlite3VdbeAddOp(v, OP_OpenPseudo, oldIdx, 0);
- sqlite3VdbeAddOp(v, OP_SetNumColumns, oldIdx, pTab->nCol);
- sqlite3VdbeAddOp(v, OP_OpenPseudo, newIdx, 0);
- sqlite3VdbeAddOp(v, OP_SetNumColumns, newIdx, pTab->nCol);
-
- /* The top of the update loop for when there are triggers.
- */
- sqlite3VdbeAddOp(v, OP_ListRewind, 0, 0);
- addr = sqlite3VdbeAddOp(v, OP_ListRead, 0, 0);
- sqlite3VdbeAddOp(v, OP_Dup, 0, 0);
-
- /* Open a cursor and make it point to the record that is
- ** being updated.
- */
- sqlite3VdbeAddOp(v, OP_Dup, 0, 0);
- if( !isView ){
- sqlite3OpenTableForReading(v, iCur, pTab);
- }
- sqlite3VdbeAddOp(v, OP_MoveGe, iCur, 0);
-
- /* Generate the OLD table
- */
- sqlite3VdbeAddOp(v, OP_Recno, iCur, 0);
- sqlite3VdbeAddOp(v, OP_RowData, iCur, 0);
- sqlite3VdbeAddOp(v, OP_PutIntKey, oldIdx, 0);
-
- /* Generate the NEW table
- */
- if( chngRecno ){
- sqlite3ExprCode(pParse, pRecnoExpr);
- }else{
- sqlite3VdbeAddOp(v, OP_Recno, iCur, 0);
- }
- for(i=0; i<pTab->nCol; i++){ /* TODO: Factor out this loop as common code */
- if( i==pTab->iPKey ){
- sqlite3VdbeAddOp(v, OP_String8, 0, 0);
- continue;
- }
- j = aXRef[i];
- if( j<0 ){
- sqlite3VdbeAddOp(v, OP_Column, iCur, i);
- }else{
- sqlite3ExprCode(pParse, pChanges->a[j].pExpr);
- }
- }
- sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0);
- if( !isView ){
- sqlite3TableAffinityStr(v, pTab);
- }
- if( pParse->nErr ) goto update_cleanup;
- sqlite3VdbeAddOp(v, OP_PutIntKey, newIdx, 0);
- if( !isView ){
- sqlite3VdbeAddOp(v, OP_Close, iCur, 0);
- }
-
- /* Fire the BEFORE and INSTEAD OF triggers
- */
- if( sqlite3CodeRowTrigger(pParse, TK_UPDATE, pChanges, TK_BEFORE, pTab,
- newIdx, oldIdx, onError, addr) ){
- goto update_cleanup;
- }
- }
-
- if( !isView ){
- /*
- ** Open every index that needs updating. Note that if any
- ** index could potentially invoke a REPLACE conflict resolution
- ** action, then we need to open all indices because we might need
- ** to be deleting some records.
- */
- sqlite3VdbeAddOp(v, OP_Integer, pTab->iDb, 0);
- sqlite3VdbeAddOp(v, OP_OpenWrite, iCur, pTab->tnum);
- sqlite3VdbeAddOp(v, OP_SetNumColumns, iCur, pTab->nCol);
- if( onError==OE_Replace ){
- openAll = 1;
- }else{
- openAll = 0;
- for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
- if( pIdx->onError==OE_Replace ){
- openAll = 1;
- break;
- }
- }
- }
- for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
- if( openAll || aIdxUsed[i] ){
- sqlite3VdbeAddOp(v, OP_Integer, pIdx->iDb, 0);
- sqlite3VdbeOp3(v, OP_OpenWrite, iCur+i+1, pIdx->tnum,
- (char*)&pIdx->keyInfo, P3_KEYINFO);
- assert( pParse->nTab>iCur+i+1 );
- }
- }
-
- /* Loop over every record that needs updating. We have to load
- ** the old data for each record to be updated because some columns
- ** might not change and we will need to copy the old value.
- ** Also, the old data is needed to delete the old index entires.
- ** So make the cursor point at the old record.
- */
- if( !row_triggers_exist ){
- sqlite3VdbeAddOp(v, OP_ListRewind, 0, 0);
- addr = sqlite3VdbeAddOp(v, OP_ListRead, 0, 0);
- sqlite3VdbeAddOp(v, OP_Dup, 0, 0);
- }
- sqlite3VdbeAddOp(v, OP_NotExists, iCur, addr);
-
- /* If the record number will change, push the record number as it
- ** will be after the update. (The old record number is currently
- ** on top of the stack.)
- */
- if( chngRecno ){
- sqlite3ExprCode(pParse, pRecnoExpr);
- sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);
- }
-
- /* Compute new data for this record.
- */
- for(i=0; i<pTab->nCol; i++){
- if( i==pTab->iPKey ){
- sqlite3VdbeAddOp(v, OP_String8, 0, 0);
- continue;
- }
- j = aXRef[i];
- if( j<0 ){
- sqlite3VdbeAddOp(v, OP_Column, iCur, i);
- }else{
- sqlite3ExprCode(pParse, pChanges->a[j].pExpr);
- }
- }
-
- /* Do constraint checks
- */
- sqlite3GenerateConstraintChecks(pParse, pTab, iCur, aIdxUsed, chngRecno, 1,
- onError, addr);
-
- /* Delete the old indices for the current record.
- */
- sqlite3GenerateRowIndexDelete(db, v, pTab, iCur, aIdxUsed);
-
- /* If changing the record number, delete the old record.
- */
- if( chngRecno ){
- sqlite3VdbeAddOp(v, OP_Delete, iCur, 0);
- }
-
- /* Create the new index entries and the new record.
- */
- sqlite3CompleteInsertion(pParse, pTab, iCur, aIdxUsed, chngRecno, 1, -1);
- }
-
- /* Increment the row counter
- */
- if( db->flags & SQLITE_CountRows && !pParse->trigStack){
- sqlite3VdbeAddOp(v, OP_AddImm, 1, 0);
- }
-
- /* If there are triggers, close all the cursors after each iteration
- ** through the loop. The fire the after triggers.
- */
- if( row_triggers_exist ){
- if( !isView ){
- for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
- if( openAll || aIdxUsed[i] )
- sqlite3VdbeAddOp(v, OP_Close, iCur+i+1, 0);
- }
- sqlite3VdbeAddOp(v, OP_Close, iCur, 0);
- }
- if( sqlite3CodeRowTrigger(pParse, TK_UPDATE, pChanges, TK_AFTER, pTab,
- newIdx, oldIdx, onError, addr) ){
- goto update_cleanup;
- }
- }
-
- /* Repeat the above with the next record to be updated, until
- ** all record selected by the WHERE clause have been updated.
- */
- sqlite3VdbeAddOp(v, OP_Goto, 0, addr);
- sqlite3VdbeChangeP2(v, addr, sqlite3VdbeCurrentAddr(v));
- sqlite3VdbeAddOp(v, OP_ListReset, 0, 0);
-
- /* Close all tables if there were no FOR EACH ROW triggers */
- if( !row_triggers_exist ){
- for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
- if( openAll || aIdxUsed[i] ){
- sqlite3VdbeAddOp(v, OP_Close, iCur+i+1, 0);
- }
- }
- sqlite3VdbeAddOp(v, OP_Close, iCur, 0);
- }else{
- sqlite3VdbeAddOp(v, OP_Close, newIdx, 0);
- sqlite3VdbeAddOp(v, OP_Close, oldIdx, 0);
- }
-
- /*
- ** Return the number of rows that were changed.
- */
- if( db->flags & SQLITE_CountRows && !pParse->trigStack ){
- sqlite3VdbeAddOp(v, OP_Callback, 1, 0);
- sqlite3VdbeSetNumCols(v, 1);
- sqlite3VdbeSetColName(v, 0, "rows updated", P3_STATIC);
- }
-
-update_cleanup:
- sqlite3AuthContextPop(&sContext);
- sqliteFree(apIdx);
- sqliteFree(aXRef);
- sqlite3SrcListDelete(pTabList);
- sqlite3ExprListDelete(pChanges);
- sqlite3ExprDelete(pWhere);
- return;
-}