SQLite

**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.135 2003/03/27 13:50:00 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Check to see if the schema for the database needs

** a particular database table given the name
** of that table.  Return NULL if not found.
*/
Table *sqliteFindTable(sqlite *db, const char *zName, const char *zDatabase){
  Table *p = 0;
  int i;
  for(i=0; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;   /* Search TEMP before MAIN */
    if( zDatabase!=0 && sqliteStrICmp(zDatabase, db->aDb[j].zName) ) continue;
    p = sqliteHashFind(&db->aDb[j].tblHash, zName, strlen(zName)+1);
    if( p ) break;
  }
  return p;
}

/*
** Locate the in-memory structure that describes 
** a particular index given the name of that index.
** Return NULL if not found.
*/
Index *sqliteFindIndex(sqlite *db, const char *zName, const char *zDb){
  Index *p = 0;
  int i;
  for(i=0; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqliteStrICmp(zDb, db->aDb[j].zName) ) continue;
    p = sqliteHashFind(&db->aDb[j].idxHash, zName, strlen(zName)+1);
    if( p ) break;
  }
  return p;
}

/*
** Remove the given index from the index hash table, and free

  /*
  ** Find the table that is to be indexed.  Return early if not found.
  */
  if( pTable!=0 ){
    assert( pName!=0 );
    assert( pTable->nSrc==1 );
    pTab =  sqliteSrcListLookup(pParse, pTable);

  }else{
    assert( pName==0 );
    pTab =  pParse->pNewTable;
  }
  if( pTab==0 || pParse->nErr ) goto exit_create_index;
  if( !isTemp && (pTab->readOnly || pTab->iDb>=2) ){
    sqliteSetString(&pParse->zErrMsg, "table ", pTab->zName, 

  Index *pIdx;
  char *zFile = 0;
  sqlite *db = pParse->db;


  if( sqlite_malloc_failed  ) goto copy_cleanup;
  assert( pTableName->nSrc==1 );
  pTab = sqliteSrcListLookup(pParse, pTableName);

  if( pTab==0 || sqliteIsReadOnly(pParse, pTab) ) goto copy_cleanup;
  zFile = sqliteStrNDup(pFilename->z, pFilename->n);
  sqliteDequote(zFile);
  if( sqliteAuthCheck(pParse, SQLITE_INSERT, pTab->zName, zFile)
      || sqliteAuthCheck(pParse, SQLITE_COPY, pTab->zName, zFile) ){
    goto copy_cleanup;
  }
  v = sqliteGetVdbe(pParse);

**    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 DELETE FROM statements.
**
** $Id: delete.c,v 1.49 2003/03/27 13:50:00 drh 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.
*/
Table *sqliteSrcListLookup(Parse *pParse, SrcList *pSrc){
  Table *pTab = 0;
  int i;
  for(i=0; i<pSrc->nSrc; i++){
    const char *zTab = pSrc->a[i].zName;
    const char *zDb = pSrc->a[i].zDatabase;
    pTab = sqliteFindTable(pParse->db, zTab, zDb);
    if( pTab==0 ){
      if( zDb==0 || zDb[0]==0 ){
        sqliteSetString(&pParse->zErrMsg, "no such table: ", zTab, 0);
      }else{
        sqliteSetString(&pParse->zErrMsg, "no such table: ", zDb, ".", zTab, 0);
      }
      pParse->nErr++;
      break;
    }
    pSrc->a[i].pTab = pTab;
  }
  return pTab;
}

/*
** Check to make sure the given table is writable.  If it is not
** writable, generate an error message and return 1.  If it is
** writable return 0;
*/
int sqliteIsReadOnly(Parse *pParse, Table *pTab){
  if( pTab->readOnly || pTab->pSelect ){
    sqliteSetString(&pParse->zErrMsg, 
      pTab->pSelect ? "view " : "table ", pTab->zName,

      " may not be modified", 0);
    pParse->nErr++;
    return 1;
  }
  return 0;
}

/*
** Process a DELETE FROM statement.
*/
void sqliteDeleteFrom(
  Parse *pParse,         /* The parser context */
  SrcList *pTabList,     /* The table from which we should delete things */

  }

  /* Locate the table which we want to delete.  This table has to be
  ** put in an SrcList structure because some of the subroutines we
  ** will be calling are designed to work with multiple tables and expect
  ** an SrcList* parameter instead of just a Table* parameter.
  */
  pTab = sqliteSrcListLookup(pParse, pTabList);
  if( pTab==0 || sqliteIsReadOnly(pParse, pTab) ){
    goto delete_from_cleanup;
  }
  assert( pTab->pSelect==0 );  /* This table is not a view */
  if( sqliteAuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0) ){
    goto delete_from_cleanup;
  }

**    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 INSERT statements in SQLite.
**
** $Id: insert.c,v 1.76 2003/03/27 13:50:00 drh Exp $
*/
#include "sqliteInt.h"

/*
** This routine is call to handle SQL of the following forms:
**
**    insert into TABLE (IDLIST) values(EXPRLIST)

  ExprList *pList,      /* List of values to be inserted */
  Select *pSelect,      /* A SELECT statement to use as the data source */
  IdList *pColumn,      /* Column names corresponding to IDLIST. */
  int onError           /* How to handle constraint errors */
){
  Table *pTab;          /* The table to insert into */
  char *zTab;           /* Name of the table into which we are inserting */

  int i, j, idx;        /* Loop counters */
  Vdbe *v;              /* Generate code into this virtual machine */
  Index *pIdx;          /* For looping over indices of the table */
  int nColumn;          /* Number of columns in the data */
  int base;             /* First available cursor */
  int iCont, iBreak;    /* Beginning and end of the loop over srcTab */
  sqlite *db;           /* The main database structure */

  db = pParse->db;

  /* Locate the table into which we will be inserting new information.
  */
  assert( pTabList->nSrc==1 );
  zTab = pTabList->a[0].zName;
  if( zTab==0 ) goto insert_cleanup;

  pTab = sqliteSrcListLookup(pParse, pTabList);
  if( pTab==0 ){
    goto insert_cleanup;
  }
  if( sqliteAuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0) ){
    goto insert_cleanup;
  }

/*
** 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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.166 2003/03/27 13:50:00 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"

#endif
#ifndef SQLITE_OMIT_AUTHORIZATION
  int (*xAuth)(void*,int,const char*,const char*); /* Access Auth function */
  void *pAuthArg;               /* 1st argument to the access auth function */
#endif
};

/*
** The following are the indices of in sqlite.aDb[] of the main database
** file and the file used to store TEMP tables.
*/
#define DB_TMP     0
#define DB_MAIN    1

/*
** Possible values for the sqlite.flags.
*/
#define SQLITE_VdbeTrace      0x00000001  /* True to trace VDBE execution */
#define SQLITE_Initialized    0x00000002  /* True after initialization */
#define SQLITE_Interrupt      0x00000004  /* Cancel current operation */
#define SQLITE_InTrans        0x00000008  /* True if in a transaction */

void sqliteAddKeyType(Vdbe*, ExprList*);
void sqliteAddIdxKeyType(Vdbe*, Index*);
int sqliteSelect(Parse*, Select*, int, int, Select*, int, int*);
Select *sqliteSelectNew(ExprList*,SrcList*,Expr*,ExprList*,Expr*,ExprList*,
                        int,int,int);
void sqliteSelectDelete(Select*);
void sqliteSelectUnbind(Select*);
Table *sqliteSrcListLookup(Parse*, SrcList*);
int sqliteIsReadOnly(Parse*, Table*);
void sqliteDeleteFrom(Parse*, SrcList*, Expr*);
void sqliteUpdate(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqliteWhereBegin(Parse*, int, SrcList*, Expr*, int, ExprList**);
void sqliteWhereEnd(WhereInfo*);
void sqliteExprCode(Parse*, Expr*);
void sqliteExprIfTrue(Parse*, Expr*, int, int);
void sqliteExprIfFalse(Parse*, Expr*, int, int);

  ** 2. the table (or view) does exist.
  ** 3. that we are not trying to create a trigger on the sqlite_master table
  ** 4. That we are not trying to create an INSTEAD OF trigger on a table.
  ** 5. That we are not trying to create a BEFORE or AFTER trigger on a view.
  */
  if( sqlite_malloc_failed ) goto trigger_cleanup;
  assert( pTableName->nSrc==1 );
  tab = sqliteSrcListLookup(pParse, pTableName);

  if( !tab ){
    goto trigger_cleanup;
  }
  if( tab->iDb>=2 ){
    sqliteSetString(&pParse->zErrMsg, "triggers may not be added to "
       "auxiliary database \"", db->aDb[tab->iDb].zName, "\"", 0);
    pParse->nErr++;

  if( sqlite_malloc_failed ) goto drop_trigger_cleanup;
  assert( pName->nSrc==1 );
  zDb = pName->a[0].zDatabase;
  zName = pName->a[0].zName;
  nName = strlen(zName);
  for(i=0; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqliteStrICmp(db->aDb[j].zName, zDb) ) continue;
    pTrigger = sqliteHashFind(&(db->aDb[j].trigHash), zName, nName+1);
    if( pTrigger ) break;
  }
  if( !pTrigger ){
    sqliteSetString(&pParse->zErrMsg, "no such trigger: ", zName, 0);
    goto drop_trigger_cleanup;
  }
  assert( pTrigger->iDb>=0 && pTrigger->iDb<db->nDb );

**    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: update.c,v 1.57 2003/03/27 13:50:00 drh Exp $
*/
#include "sqliteInt.h"

/*
** Process an UPDATE statement.
*/
void sqliteUpdate(

  }

  /* Locate the table which we want to update.  This table has to be
  ** put in an SrcList structure because some of the subroutines we
  ** will be calling are designed to work with multiple tables and expect
  ** an SrcList* parameter instead of just a Table* parameter.
  */
  pTab = sqliteSrcListLookup(pParse, pTabList);
  if( pTab==0 || sqliteIsReadOnly(pParse, pTab) ) goto update_cleanup;
  assert( pTab->pSelect==0 );  /* This table is not a VIEW */
  aXRef = sqliteMalloc( 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 temp tables */
  if( row_triggers_exist ){