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Overview
Comment:Updated LIMIT support for DELETE/UPDATE. Omit option changed to SQLITE_ENABLE_UPDATE_DELETE_LIMIT. (CVS 5788)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: c10e8a3c7ab7f21c95f24d0aba590f5b18a4b028
User & Date: shane 2008-10-10 04:34:16
Context
2008-10-10
06:02
Initial test cases for the new LIMIT/OFFSET support for DELETE/UPDATE. (CVS 5789) (check-in: d9f5e15c user: shane tags: trunk)
04:34
Updated LIMIT support for DELETE/UPDATE. Omit option changed to SQLITE_ENABLE_UPDATE_DELETE_LIMIT. (CVS 5788) (check-in: c10e8a3c user: shane tags: trunk)
2008-10-09
18:48
Fix an assert() failure that can occur if the user attempts to set an into an integer primary key column to a text value in a table that has a BEFORE UPDATE trigger. (CVS 5787) (check-in: c2cf9d60 user: danielk1977 tags: trunk)
Changes
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Changes to src/delete.c. 

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**    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
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.178 2008/10/07 05:27:11 shane Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
................................................................................
  }
  sqlite3SelectDestInit(&dest, SRT_EphemTab, iCur);
  sqlite3Select(pParse, pDup, &dest);
  sqlite3SelectDelete(db, pDup);
}
#endif /* !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER) */

#ifndef SQLITE_OMIT_UPDATE_DELETE_LIMIT
/*
** Generate an expression tree to implement the WHERE, ORDER BY,
** and LIMIT/OFFSET portion of DELETE and UPDATE statements.
**
**     DELETE FROM table_wxyz WHERE a<5 ORDER BY a LIMIT 1;
**                            \__________________________/
**                               pLimitWhere (pInClause)
................................................................................
  Parse *pParse,          /* The parser context */
  SrcList *pSrc,          /* the FROM clause -- which tables to scan */
  Expr *pWhere,           /* The WHERE clause.  May be null */
  ExprList *pOrderBy,     /* The ORDER BY clause.  May be null */
  Expr *pLimit,           /* The LIMIT clause.  May be null */
  Expr *pOffset           /* The OFFSET clause.  May be null */
){
  Expr *pWhereRowid = sqlite3Expr(pParse->db, TK_ROW, 0, 0, 0);
  Expr *pInClause = sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0, 0);


















  Expr *pSelectRowid = sqlite3Expr(pParse->db, TK_ROW, 0, 0, 0);

  ExprList *pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid, 0);



  SrcList *pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc);


  Select *pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,pOrderBy,0,pLimit,pOffset);
  if( pSelect ) {





    pInClause->pSelect = pSelect;
    sqlite3ExprSetHeight(pParse, pInClause);
    return pInClause;
  }


  sqlite3SrcListDelete(pParse->db, pSelectSrc);
  sqlite3ExprListDelete(pParse->db, pEList);
  sqlite3ExprDelete(pParse->db, pSelectRowid);
  sqlite3ExprDelete(pParse->db, pInClause);
  sqlite3ExprDelete(pParse->db, pWhereRowid);
  return 0;
}
#endif /* !defined(SQLITE_OMIT_UPDATE_DELETE_LIMIT) */

/*
** Generate code for a DELETE FROM statement.
**
**     DELETE FROM table_wxyz WHERE a<5 AND b NOT NULL;
**                 \________/       \________________/
**                  pTabList              pWhere








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**    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
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.179 2008/10/10 04:34:16 shane Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
................................................................................
  }
  sqlite3SelectDestInit(&dest, SRT_EphemTab, iCur);
  sqlite3Select(pParse, pDup, &dest);
  sqlite3SelectDelete(db, pDup);
}
#endif /* !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER) */

#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
/*
** Generate an expression tree to implement the WHERE, ORDER BY,
** and LIMIT/OFFSET portion of DELETE and UPDATE statements.
**
**     DELETE FROM table_wxyz WHERE a<5 ORDER BY a LIMIT 1;
**                            \__________________________/
**                               pLimitWhere (pInClause)
................................................................................
  Parse *pParse,          /* The parser context */
  SrcList *pSrc,          /* the FROM clause -- which tables to scan */
  Expr *pWhere,           /* The WHERE clause.  May be null */
  ExprList *pOrderBy,     /* The ORDER BY clause.  May be null */
  Expr *pLimit,           /* The LIMIT clause.  May be null */
  Expr *pOffset           /* The OFFSET clause.  May be null */
){
  Expr *pWhereRowid = NULL;
  Expr *pInClause = NULL;
  Expr *pSelectRowid = NULL;
  ExprList *pEList = NULL;
  SrcList *pSelectSrc = NULL;
  Select *pSelect = NULL;

  /* We only need to generate a select expression if there
  ** is a limit/offset term to enforce.
  */
  if (!pLimit && !pOffset) return pWhere;

  /* Generate a select expression tree to enforce the limit/offset 
  ** term for the DELETE or UPDATE statement.  For example:
  **   DELETE FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
  ** becomes:
  **   DELETE FROM table_a WHERE rowid IN ( 
  **     DELETE rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
  **   );
  */
  pSelectRowid = sqlite3Expr(pParse->db, TK_ROW, 0, 0, 0);
  if( pSelectRowid == 0 ) goto limit_where_cleanup;
  pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid, 0);
  if( pEList == 0 ) goto limit_where_cleanup;
  /* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
  ** and the DELETE tree. */
  pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc);
  if( pSelectSrc == 0 ) goto limit_where_cleanup;
  /* generate the DELETE expression tree. */
  pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,pOrderBy,0,pLimit,pOffset);
  if( pSelect == 0 ) goto limit_where_cleanup;
  /* generate the WHERE rowid IN ( select ) expression */
  pWhereRowid = sqlite3Expr(pParse->db, TK_ROW, 0, 0, 0);
  if( pWhereRowid == 0 ) goto limit_where_cleanup;
  pInClause = sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0, 0);
  if( pInClause == 0 ) goto limit_where_cleanup;
  pInClause->pSelect = pSelect;
  sqlite3ExprSetHeight(pParse, pInClause);
  return pInClause;

limit_where_cleanup:
  /* something went wrong. clean up anything allocated. */
  sqlite3SrcListDelete(pParse->db, pSelectSrc);
  sqlite3ExprListDelete(pParse->db, pEList);
  sqlite3ExprDelete(pParse->db, pSelectRowid);
  sqlite3ExprDelete(pParse->db, pInClause);
  sqlite3ExprDelete(pParse->db, pWhereRowid);
  return 0;
}
#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY) */

/*
** Generate code for a DELETE FROM statement.
**
**     DELETE FROM table_wxyz WHERE a<5 AND b NOT NULL;
**                 \________/       \________________/
**                  pTabList              pWhere

Changes to src/parse.y. 

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**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.255 2008/10/07 05:27:11 shane Exp $
*/

// All token codes are small integers with #defines that begin with "TK_"
%token_prefix TK_

// The type of the data attached to each token is Token.  This is also the
// default type for non-terminals.
................................................................................
limit_opt(A) ::= LIMIT expr(X) OFFSET expr(Y). 
                                       {A.pLimit = X; A.pOffset = Y;}
limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y). 
                                       {A.pOffset = X; A.pLimit = Y;}

/////////////////////////// The DELETE statement /////////////////////////////
//
%ifndef SQLITE_OMIT_UPDATE_DELETE_LIMIT
cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W) orderby_opt(O) limit_opt(L). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  if( O && !L.pLimit ){
    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on DELETE");
    pParse->parseError = 1;
  } else if (L.pLimit) {
    Expr *LW = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset);
................................................................................
      sqlite3DeleteFrom(pParse,X,LW);
    }
  } else {
    sqlite3DeleteFrom(pParse,X,W);
  }
}
%endif
%ifdef SQLITE_OMIT_UPDATE_DELETE_LIMIT
cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3DeleteFrom(pParse,X,W);
}
%endif

%type where_opt {Expr*}
................................................................................
%destructor where_opt {sqlite3ExprDelete(pParse->db, $$);}

where_opt(A) ::= .                    {A = 0;}
where_opt(A) ::= WHERE expr(X).       {A = X;}

////////////////////////// The UPDATE command ////////////////////////////////
//
%ifndef SQLITE_OMIT_UPDATE_DELETE_LIMIT
cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y) where_opt(W) orderby_opt(O) limit_opt(L).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  if( O && !L.pLimit ){
    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on UPDATE");
    pParse->parseError = 1;
  } else if (L.pLimit) {
................................................................................
      sqlite3Update(pParse,X,Y,LW,R);
    }
  } else {
    sqlite3Update(pParse,X,Y,W,R);
  }
}
%endif
%ifdef SQLITE_OMIT_UPDATE_DELETE_LIMIT
cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y) where_opt(W).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  sqlite3Update(pParse,X,Y,W,R);
}
%endif









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**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.256 2008/10/10 04:34:16 shane Exp $
*/

// All token codes are small integers with #defines that begin with "TK_"
%token_prefix TK_

// The type of the data attached to each token is Token.  This is also the
// default type for non-terminals.
................................................................................
limit_opt(A) ::= LIMIT expr(X) OFFSET expr(Y). 
                                       {A.pLimit = X; A.pOffset = Y;}
limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y). 
                                       {A.pOffset = X; A.pLimit = Y;}

/////////////////////////// The DELETE statement /////////////////////////////
//
%ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W) orderby_opt(O) limit_opt(L). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  if( O && !L.pLimit ){
    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on DELETE");
    pParse->parseError = 1;
  } else if (L.pLimit) {
    Expr *LW = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset);
................................................................................
      sqlite3DeleteFrom(pParse,X,LW);
    }
  } else {
    sqlite3DeleteFrom(pParse,X,W);
  }
}
%endif
%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3DeleteFrom(pParse,X,W);
}
%endif

%type where_opt {Expr*}
................................................................................
%destructor where_opt {sqlite3ExprDelete(pParse->db, $$);}

where_opt(A) ::= .                    {A = 0;}
where_opt(A) ::= WHERE expr(X).       {A = X;}

////////////////////////// The UPDATE command ////////////////////////////////
//
%ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y) where_opt(W) orderby_opt(O) limit_opt(L).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  if( O && !L.pLimit ){
    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on UPDATE");
    pParse->parseError = 1;
  } else if (L.pLimit) {
................................................................................
      sqlite3Update(pParse,X,Y,LW,R);
    }
  } else {
    sqlite3Update(pParse,X,Y,W,R);
  }
}
%endif
%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y) where_opt(W).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  sqlite3Update(pParse,X,Y,W,R);
}
%endif

Changes to src/resolve.c. 

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**
*************************************************************************
**
** This file contains routines used for walking the parser tree and
** resolve all identifiers by associating them with a particular
** table and column.
**
** $Id: resolve.c,v 1.7 2008/10/06 15:18:02 drh Exp $
*/
#include "sqliteInt.h"
#include <stdlib.h>
#include <string.h>

/*
** Turn the pExpr expression into an alias for the iCol-th column of the
................................................................................
    for(i=0; i<pNC->pSrcList->nSrc; i++){
      assert( pSrcList->a[i].iCursor>=0 && pSrcList->a[i].iCursor<pParse->nTab);
    }
  }
#endif
  switch( pExpr->op ){

#ifndef SQLITE_OMIT_UPDATE_DELETE_LIMIT
    /* The special operator TK_ROW means use the rowid for the first
    ** column in the FROM clause.  This is used by the LIMIT and ORDER BY
    ** clause processing on UPDATE and DELETE statements.
    */
    case TK_ROW: {
      SrcList *pSrcList = pNC->pSrcList;
      struct SrcList_item *pItem;
................................................................................
      pExpr->op = TK_COLUMN;
      pExpr->pTab = pItem->pTab;
      pExpr->iTable = pItem->iCursor;
      pExpr->iColumn = -1;
      pExpr->affinity = SQLITE_AFF_INTEGER;
      break;
    }
#endif /* SQLITE_OMIT_UPDATE_DELETE_LIMIT */

    /* A lone identifier is the name of a column.
    */
    case TK_ID: {
      lookupName(pParse, 0, 0, &pExpr->token, pNC, pExpr);
      return WRC_Prune;
    }








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**
*************************************************************************
**
** This file contains routines used for walking the parser tree and
** resolve all identifiers by associating them with a particular
** table and column.
**
** $Id: resolve.c,v 1.8 2008/10/10 04:34:16 shane Exp $
*/
#include "sqliteInt.h"
#include <stdlib.h>
#include <string.h>

/*
** Turn the pExpr expression into an alias for the iCol-th column of the
................................................................................
    for(i=0; i<pNC->pSrcList->nSrc; i++){
      assert( pSrcList->a[i].iCursor>=0 && pSrcList->a[i].iCursor<pParse->nTab);
    }
  }
#endif
  switch( pExpr->op ){

#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
    /* The special operator TK_ROW means use the rowid for the first
    ** column in the FROM clause.  This is used by the LIMIT and ORDER BY
    ** clause processing on UPDATE and DELETE statements.
    */
    case TK_ROW: {
      SrcList *pSrcList = pNC->pSrcList;
      struct SrcList_item *pItem;
................................................................................
      pExpr->op = TK_COLUMN;
      pExpr->pTab = pItem->pTab;
      pExpr->iTable = pItem->iCursor;
      pExpr->iColumn = -1;
      pExpr->affinity = SQLITE_AFF_INTEGER;
      break;
    }
#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY) */

    /* A lone identifier is the name of a column.
    */
    case TK_ID: {
      lookupName(pParse, 0, 0, &pExpr->token, pNC, pExpr);
      return WRC_Prune;
    }

Changes to src/sqliteInt.h. 

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**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.779 2008/10/07 23:46:38 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Include the configuration header output by 'configure' if we're using the
** autoconf-based build
................................................................................
int sqlite3Select(Parse*, Select*, SelectDest*);
Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
                         Expr*,ExprList*,int,Expr*,Expr*);
void sqlite3SelectDelete(sqlite3*, Select*);
Table *sqlite3SrcListLookup(Parse*, SrcList*);
int sqlite3IsReadOnly(Parse*, Table*, int);
void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
#ifndef SQLITE_OMIT_UPDATE_DELETE_LIMIT
Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *);
#endif
void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**, u8);
void sqlite3WhereEnd(WhereInfo*);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, int);








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**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.780 2008/10/10 04:34:16 shane Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Include the configuration header output by 'configure' if we're using the
** autoconf-based build
................................................................................
int sqlite3Select(Parse*, Select*, SelectDest*);
Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
                         Expr*,ExprList*,int,Expr*,Expr*);
void sqlite3SelectDelete(sqlite3*, Select*);
Table *sqlite3SrcListLookup(Parse*, SrcList*);
int sqlite3IsReadOnly(Parse*, Table*, int);
void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *);
#endif
void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**, u8);
void sqlite3WhereEnd(WhereInfo*);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, int);

Changes to src/test_config.c. 

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** 
** This file contains code used for testing the SQLite system.
** None of the code in this file goes into a deliverable build.
** 
** The focus of this file is providing the TCL testing layer
** access to compile-time constants.
**
** $Id: test_config.c,v 1.38 2008/10/07 15:25:49 drh Exp $
*/

#include "sqliteLimit.h"

#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
................................................................................
#endif

#ifdef SQLITE_OMIT_WSD
  Tcl_SetVar2(interp, "sqlite_options", "wsd", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "wsd", "1", TCL_GLOBAL_ONLY);
#endif







#ifdef SQLITE_SECURE_DELETE
  Tcl_SetVar2(interp, "sqlite_options", "secure_delete", "1", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "secure_delete", "0", TCL_GLOBAL_ONLY);
#endif









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** 
** This file contains code used for testing the SQLite system.
** None of the code in this file goes into a deliverable build.
** 
** The focus of this file is providing the TCL testing layer
** access to compile-time constants.
**
** $Id: test_config.c,v 1.39 2008/10/10 04:34:16 shane Exp $
*/

#include "sqliteLimit.h"

#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
................................................................................
#endif

#ifdef SQLITE_OMIT_WSD
  Tcl_SetVar2(interp, "sqlite_options", "wsd", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "wsd", "1", TCL_GLOBAL_ONLY);
#endif

#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
  Tcl_SetVar2(interp, "sqlite_options", "update_delete_limit", "1", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "update_delete_limit", "0", TCL_GLOBAL_ONLY);
#endif

#ifdef SQLITE_SECURE_DELETE
  Tcl_SetVar2(interp, "sqlite_options", "secure_delete", "1", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "secure_delete", "0", TCL_GLOBAL_ONLY);
#endif

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