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Overview
Comment:Split the logic for the ALTER TABLE command off into a separate source code file. (CVS 2342)
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SHA1:90d6573c2631fac92b9e572e9e21698ae2480c9d
User & Date: drh 2005-02-15 20:47:57
Context
2005-02-15
21:36
Move the special built-in SQL functions used by ALTER TABLE out of func.c and into alter.c. (CVS 2343) check-in: dbd11a0c user: drh tags: trunk
20:47
Split the logic for the ALTER TABLE command off into a separate source code file. (CVS 2342) check-in: 90d6573c user: drh tags: trunk
16:23
Btree checks the autovacuum flag after locking the database file. (CVS 2341) check-in: 6610188f user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to Makefile.in. 

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###############################################################################

OPTS += -DSQLITE_OMIT_CURSOR          # Cursors do not work at this time
TCC += -DSQLITE_OMIT_CURSOR

# Object files for the SQLite library.
#
LIBOBJ = attach.lo auth.lo btree.lo build.lo date.lo \
         delete.lo expr.lo func.lo hash.lo insert.lo \
         main.lo opcodes.lo os_unix.lo os_win.lo \
         pager.lo parse.lo pragma.lo printf.lo random.lo \
         select.lo table.lo tokenize.lo trigger.lo update.lo \
         util.lo vacuum.lo vdbe.lo vdbeapi.lo vdbeaux.lo vdbemem.lo \
         where.lo utf.lo legacy.lo

# All of the source code files.
#
SRC = \

  $(TOP)/src/attach.c \
  $(TOP)/src/auth.c \
  $(TOP)/src/btree.c \
  $(TOP)/src/btree.h \
  $(TOP)/src/build.c \
  $(TOP)/src/date.c \
  $(TOP)/src/delete.c \
................................................................................
lemon$(BEXE):	$(TOP)/tool/lemon.c $(TOP)/tool/lempar.c
	$(BCC) -o lemon $(TOP)/tool/lemon.c
	cp $(TOP)/tool/lempar.c .


# Rules to build individual files
#



attach.lo:	$(TOP)/src/attach.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/attach.c

auth.lo:	$(TOP)/src/auth.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/auth.c

btree.lo:	$(TOP)/src/btree.c $(HDR) $(TOP)/src/pager.h








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>








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###############################################################################

OPTS += -DSQLITE_OMIT_CURSOR          # Cursors do not work at this time
TCC += -DSQLITE_OMIT_CURSOR

# Object files for the SQLite library.
#
LIBOBJ = alter.lo attach.lo auth.lo btree.lo build.lo date.lo \
         delete.lo expr.lo func.lo hash.lo insert.lo \
         main.lo opcodes.lo os_unix.lo os_win.lo \
         pager.lo parse.lo pragma.lo printf.lo random.lo \
         select.lo table.lo tokenize.lo trigger.lo update.lo \
         util.lo vacuum.lo vdbe.lo vdbeapi.lo vdbeaux.lo vdbemem.lo \
         where.lo utf.lo legacy.lo

# All of the source code files.
#
SRC = \
  $(TOP)/src/alter.c \
  $(TOP)/src/attach.c \
  $(TOP)/src/auth.c \
  $(TOP)/src/btree.c \
  $(TOP)/src/btree.h \
  $(TOP)/src/build.c \
  $(TOP)/src/date.c \
  $(TOP)/src/delete.c \
................................................................................
lemon$(BEXE):	$(TOP)/tool/lemon.c $(TOP)/tool/lempar.c
	$(BCC) -o lemon $(TOP)/tool/lemon.c
	cp $(TOP)/tool/lempar.c .


# Rules to build individual files
#
alter.lo:	$(TOP)/src/alter.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/alter.c

attach.lo:	$(TOP)/src/attach.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/attach.c

auth.lo:	$(TOP)/src/auth.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/auth.c

btree.lo:	$(TOP)/src/btree.c $(HDR) $(TOP)/src/pager.h

Changes to main.mk. 

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# This is how we compile
#
TCCX = $(TCC) $(OPTS) $(THREADSAFE) $(USLEEP) -I. -I$(TOP)/src

# Object files for the SQLite library.
#
LIBOBJ+= attach.o auth.o btree.o build.o date.o delete.o \
         expr.o func.o hash.o insert.o \
         main.o opcodes.o os_unix.o os_win.o \
         pager.o parse.o pragma.o printf.o random.o \
         select.o table.o tclsqlite.o tokenize.o trigger.o \
         update.o util.o vacuum.o \
         vdbe.o vdbeapi.o vdbeaux.o vdbemem.o \
         where.o utf.o legacy.o

# All of the source code files.
#
SRC = \

  $(TOP)/src/attach.c \
  $(TOP)/src/auth.c \
  $(TOP)/src/btree.c \
  $(TOP)/src/btree.h \
  $(TOP)/src/build.c \
  $(TOP)/src/date.c \
  $(TOP)/src/delete.c \
................................................................................
#
lemon:	$(TOP)/tool/lemon.c $(TOP)/tool/lempar.c
	$(BCC) -o lemon $(TOP)/tool/lemon.c
	cp $(TOP)/tool/lempar.c .

# Rules to build individual files
#



attach.o:	$(TOP)/src/attach.c $(HDR)
	$(TCCX) -c $(TOP)/src/attach.c

auth.o:	$(TOP)/src/auth.c $(HDR)
	$(TCCX) -c $(TOP)/src/auth.c

btree.o:	$(TOP)/src/btree.c $(HDR) $(TOP)/src/pager.h








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# This is how we compile
#
TCCX = $(TCC) $(OPTS) $(THREADSAFE) $(USLEEP) -I. -I$(TOP)/src

# Object files for the SQLite library.
#
LIBOBJ+= alter.o attach.o auth.o btree.o build.o date.o delete.o \
         expr.o func.o hash.o insert.o \
         main.o opcodes.o os_unix.o os_win.o \
         pager.o parse.o pragma.o printf.o random.o \
         select.o table.o tclsqlite.o tokenize.o trigger.o \
         update.o util.o vacuum.o \
         vdbe.o vdbeapi.o vdbeaux.o vdbemem.o \
         where.o utf.o legacy.o

# All of the source code files.
#
SRC = \
  $(TOP)/src/alter.c \
  $(TOP)/src/attach.c \
  $(TOP)/src/auth.c \
  $(TOP)/src/btree.c \
  $(TOP)/src/btree.h \
  $(TOP)/src/build.c \
  $(TOP)/src/date.c \
  $(TOP)/src/delete.c \
................................................................................
#
lemon:	$(TOP)/tool/lemon.c $(TOP)/tool/lempar.c
	$(BCC) -o lemon $(TOP)/tool/lemon.c
	cp $(TOP)/tool/lempar.c .

# Rules to build individual files
#
alter.o:	$(TOP)/src/alter.c $(HDR)
	$(TCCX) -c $(TOP)/src/alter.c

attach.o:	$(TOP)/src/attach.c $(HDR)
	$(TCCX) -c $(TOP)/src/attach.c

auth.o:	$(TOP)/src/auth.c $(HDR)
	$(TCCX) -c $(TOP)/src/auth.c

btree.o:	$(TOP)/src/btree.c $(HDR) $(TOP)/src/pager.h

Added src/alter.c. 























































































































































































































































































































































































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/*
** 2005 February 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 used to generate VDBE code
** that implements the ALTER TABLE command.
**
** $Id: alter.c,v 1.1 2005/02/15 20:47:57 drh Exp $
*/
#include "sqliteInt.h"


#ifndef SQLITE_OMIT_ALTERTABLE
/*
** Generate code to implement the "ALTER TABLE xxx RENAME TO yyy" 
** command. 
*/
void sqlite3AlterRenameTable(
  Parse *pParse,            /* Parser context. */
  SrcList *pSrc,            /* The table to rename. */
  Token *pName              /* The new table name. */
){
  int iDb;                  /* Database that contains the table */
  char *zDb;                /* Name of database iDb */
  Table *pTab;              /* Table being renamed */
  char *zName = 0;          /* NULL-terminated version of pName */ 
  char *zWhere = 0;         /* Where clause of schema elements to reparse */
  sqlite3 *db = pParse->db; /* Database connection */
  Vdbe *v;
#ifndef SQLITE_OMIT_TRIGGER
  char *zTempTrig = 0;      /* Where clause to locate temp triggers */
#endif
  
  assert( pSrc->nSrc==1 );

  pTab = sqlite3LocateTable(pParse, pSrc->a[0].zName, pSrc->a[0].zDatabase);
  if( !pTab ) goto exit_rename_table;
  iDb = pTab->iDb;
  zDb = db->aDb[iDb].zName;

  /* Get a NULL terminated version of the new table name. */
  zName = sqlite3NameFromToken(pName);
  if( !zName ) goto exit_rename_table;

  /* Check that a table or index named 'zName' does not already exist
  ** in database iDb. If so, this is an error.
  */
  if( sqlite3FindTable(db, zName, zDb) || sqlite3FindIndex(db, zName, zDb) ){
    sqlite3ErrorMsg(pParse, 
        "there is already another table or index with this name: %s", zName);
    goto exit_rename_table;
  }

  /* Make sure it is not a system table being altered, or a reserved name
  ** that the table is being renamed to.
  */
  if( strlen(pTab->zName)>6 && 0==sqlite3StrNICmp(pTab->zName, "sqlite_", 7) ){
    sqlite3ErrorMsg(pParse, "table %s may not be altered", pTab->zName);
    goto exit_rename_table;
  }
  if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
    goto exit_rename_table;
  }

#ifndef SQLITE_OMIT_AUTHORIZATION
  /* Invoke the authorization callback. */
  if( sqlite3AuthCheck(pParse, SQLITE_ALTER_TABLE, zDb, pTab->zName, 0) ){
    goto exit_rename_table;
  }
#endif

  /* Begin a transaction and code the VerifyCookie for database iDb. 
  ** Then modify the schema cookie (since the ALTER TABLE modifies the
  ** schema).
  */
  v = sqlite3GetVdbe(pParse);
  if( v==0 ){
    goto exit_rename_table;
  }
  sqlite3BeginWriteOperation(pParse, 0, iDb);
  sqlite3ChangeCookie(db, v, iDb);

  /* Modify the sqlite_master table to use the new table name. */
  sqlite3NestedParse(pParse,
      "UPDATE %Q.%s SET "
#ifdef SQLITE_OMIT_TRIGGER
          "sql = sqlite_rename_table(sql, %Q), "
#else
          "sql = CASE "
            "WHEN type = 'trigger' THEN sqlite_rename_trigger(sql, %Q)"
            "ELSE sqlite_rename_table(sql, %Q) END, "
#endif
          "tbl_name = %Q, "
          "name = CASE "
            "WHEN type='table' THEN %Q "
            "WHEN name LIKE 'sqlite_autoindex%%' AND type='index' THEN "
              "'sqlite_autoindex_' || %Q || substr(name, %d+18,10) "
            "ELSE name END "
      "WHERE tbl_name=%Q AND "
          "(type='table' OR type='index' OR type='trigger');", 
      zDb, SCHEMA_TABLE(iDb), zName, zName, zName, 
#ifndef SQLITE_OMIT_TRIGGER
zName,
#endif
      zName, strlen(pTab->zName), pTab->zName
  );

#ifndef SQLITE_OMIT_AUTOINCREMENT
  /* If the sqlite_sequence table exists in this database, then update 
  ** it with the new table name.
  */
  if( sqlite3FindTable(db, "sqlite_sequence", zDb) ){
    sqlite3NestedParse(pParse,
        "UPDATE %Q.sqlite_sequence set name = %Q WHERE name = %Q",
        zDb, zName, pTab->zName);
  }
#endif

#ifndef SQLITE_OMIT_TRIGGER
  /* If there are TEMP triggers on this table, modify the sqlite_temp_master
  ** table. Don't do this if the table being ALTERed is itself located in
  ** the temp database.
  */
  if( iDb!=1 ){
    Trigger *pTrig;
    char *tmp = 0;
    for( pTrig=pTab->pTrigger; pTrig; pTrig=pTrig->pNext ){
      if( pTrig->iDb==1 ){
        if( !zTempTrig ){
          zTempTrig = 
              sqlite3MPrintf("type = 'trigger' AND (name=%Q", pTrig->name);
        }else{
          tmp = zTempTrig;
          zTempTrig = sqlite3MPrintf("%s OR name=%Q", zTempTrig, pTrig->name);
          sqliteFree(tmp);
        }
      }
    }
    if( zTempTrig ){
      tmp = zTempTrig;
      zTempTrig = sqlite3MPrintf("%s)", zTempTrig);
      sqliteFree(tmp);
      sqlite3NestedParse(pParse, 
          "UPDATE sqlite_temp_master SET "
              "sql = sqlite_rename_trigger(sql, %Q), "
              "tbl_name = %Q "
              "WHERE %s;", zName, zName, zTempTrig);
    }
  }
#endif

  /* Drop the elements of the in-memory schema that refered to the table
  ** renamed and load the new versions from the database.
  */
  if( pParse->nErr==0 ){
#ifndef SQLITE_OMIT_TRIGGER
    Trigger *pTrig;
    for( pTrig=pTab->pTrigger; pTrig; pTrig=pTrig->pNext ){
      assert( pTrig->iDb==iDb || pTrig->iDb==1 );
      sqlite3VdbeOp3(v, OP_DropTrigger, pTrig->iDb, 0, pTrig->name, 0);
    }
#endif
    sqlite3VdbeOp3(v, OP_DropTable, iDb, 0, pTab->zName, 0);
    zWhere = sqlite3MPrintf("tbl_name=%Q", zName);
    sqlite3VdbeOp3(v, OP_ParseSchema, iDb, 0, zWhere, P3_DYNAMIC);
#ifndef SQLITE_OMIT_TRIGGER
    if( zTempTrig ){
      sqlite3VdbeOp3(v, OP_ParseSchema, 1, 0, zTempTrig, P3_DYNAMIC);
    }
  }else{
    sqliteFree(zTempTrig);
#endif
  }

exit_rename_table:
  sqlite3SrcListDelete(pSrc);
  sqliteFree(zName);
}
#endif  /* SQLITE_ALTER_TABLE */

Changes to src/build.c. 

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**     CREATE INDEX
**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**
** $Id: build.c,v 1.310 2005/02/14 20:48:20 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Initialize the pParse structure as needed.
................................................................................
  if( pIndex ){
    sqlite3BeginWriteOperation(pParse, 0, iDb);
    sqlite3RefillIndex(pParse, pIndex, -1);
    return;
  }
  sqlite3ErrorMsg(pParse, "unable to identify the object to be reindexed");
}
#endif

#ifndef SQLITE_OMIT_ALTERTABLE
/*
** Generate code to implement the "ALTER TABLE xxx RENAME TO yyy" 
** command. 
*/
void sqlite3AlterRenameTable(
  Parse *pParse,            /* Parser context. */
  SrcList *pSrc,            /* The table to rename. */
  Token *pName              /* The new table name. */
){
  int iDb;                  /* Database that contains the table */
  char *zDb;                /* Name of database iDb */
  Table *pTab;              /* Table being renamed */
  char *zName = 0;          /* NULL-terminated version of pName */ 
  char *zWhere = 0;         /* Where clause of schema elements to reparse */
  sqlite3 *db = pParse->db; /* Database connection */
  Vdbe *v;
#ifndef SQLITE_OMIT_TRIGGER
  char *zTempTrig = 0;      /* Where clause to locate temp triggers */
#endif
  
  assert( pSrc->nSrc==1 );

  pTab = sqlite3LocateTable(pParse, pSrc->a[0].zName, pSrc->a[0].zDatabase);
  if( !pTab ) goto exit_alter_table;
  iDb = pTab->iDb;
  zDb = db->aDb[iDb].zName;

  /* Get a NULL terminated version of the new table name. */
  zName = sqlite3NameFromToken(pName);
  if( !zName ) goto exit_alter_table;

  /* Check that a table or index named 'zName' does not already exist
  ** in database iDb. If so, this is an error.
  */
  if( sqlite3FindTable(db, zName, zDb) || sqlite3FindIndex(db, zName, zDb) ){
    sqlite3ErrorMsg(pParse, 
        "there is already another table or index with this name: %s", zName);
    goto exit_alter_table;
  }

  /* Make sure it is not a system table being altered, or a reserved name
  ** that the table is being renamed to.
  */
  if( strlen(pTab->zName)>6 && 0==sqlite3StrNICmp(pTab->zName, "sqlite_", 7) ){
    sqlite3ErrorMsg(pParse, "table %s may not be altered", pTab->zName);
    goto exit_alter_table;
  }
  if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
    goto exit_alter_table;
  }

#ifndef SQLITE_OMIT_AUTHORIZATION
  /* Invoke the authorization callback. */
  if( sqlite3AuthCheck(pParse, SQLITE_ALTER_TABLE, zDb, pTab->zName, 0) ){
    goto exit_alter_table;
  }
#endif

  /* Begin a transaction and code the VerifyCookie for database iDb. 
  ** Then modify the schema cookie (since the ALTER TABLE modifies the
  ** schema).
  */
  v = sqlite3GetVdbe(pParse);
  if( v==0 ){
    goto exit_alter_table;
  }
  sqlite3BeginWriteOperation(pParse, 0, iDb);
  sqlite3ChangeCookie(db, v, iDb);

  /* Modify the sqlite_master table to use the new table name. */
  sqlite3NestedParse(pParse,
      "UPDATE %Q.%s SET "
#ifdef SQLITE_OMIT_TRIGGER
          "sql = sqlite_alter_table(sql, %Q), "
#else
          "sql = CASE "
            "WHEN type = 'trigger' THEN sqlite_alter_trigger(sql, %Q)"
            "ELSE sqlite_alter_table(sql, %Q) END, "
#endif
          "tbl_name = %Q, "
          "name = CASE "
            "WHEN type='table' THEN %Q "
            "WHEN name LIKE 'sqlite_autoindex%%' AND type='index' THEN "
              "'sqlite_autoindex_' || %Q || substr(name, %d+18,10) "
            "ELSE name END "
      "WHERE tbl_name=%Q AND "
          "(type='table' OR type='index' OR type='trigger');", 
      zDb, SCHEMA_TABLE(iDb), zName, zName, zName, 
#ifndef SQLITE_OMIT_TRIGGER
zName,
#endif
      zName, strlen(pTab->zName), pTab->zName
  );

#ifndef SQLITE_OMIT_AUTOINCREMENT
  /* If the sqlite_sequence table exists in this database, then update 
  ** it with the new table name.
  */
  if( sqlite3FindTable(db, "sqlite_sequence", zDb) ){
    sqlite3NestedParse(pParse,
        "UPDATE %Q.sqlite_sequence set name = %Q WHERE name = %Q",
        zDb, zName, pTab->zName);
  }
#endif

#ifndef SQLITE_OMIT_TRIGGER
  /* If there are TEMP triggers on this table, modify the sqlite_temp_master
  ** table. Don't do this if the table being ALTERed is itself located in
  ** the temp database.
  */
  if( iDb!=1 ){
    Trigger *pTrig;
    char *tmp = 0;
    for( pTrig=pTab->pTrigger; pTrig; pTrig=pTrig->pNext ){
      if( pTrig->iDb==1 ){
        if( !zTempTrig ){
          zTempTrig = 
              sqlite3MPrintf("type = 'trigger' AND (name=%Q", pTrig->name);
        }else{
          tmp = zTempTrig;
          zTempTrig = sqlite3MPrintf("%s OR name=%Q", zTempTrig, pTrig->name);
          sqliteFree(tmp);
        }
      }
    }
    if( zTempTrig ){
      tmp = zTempTrig;
      zTempTrig = sqlite3MPrintf("%s)", zTempTrig);
      sqliteFree(tmp);
      sqlite3NestedParse(pParse, 
          "UPDATE sqlite_temp_master SET "
              "sql = sqlite_alter_trigger(sql, %Q), "
              "tbl_name = %Q "
              "WHERE %s;", zName, zName, zTempTrig);
    }
  }
#endif

  /* Drop the elements of the in-memory schema that refered to the table
  ** renamed and load the new versions from the database.
  */
  if( pParse->nErr==0 ){
#ifndef SQLITE_OMIT_TRIGGER
    Trigger *pTrig;
    for( pTrig=pTab->pTrigger; pTrig; pTrig=pTrig->pNext ){
      assert( pTrig->iDb==iDb || pTrig->iDb==1 );
      sqlite3VdbeOp3(v, OP_DropTrigger, pTrig->iDb, 0, pTrig->name, 0);
    }
#endif
    sqlite3VdbeOp3(v, OP_DropTable, iDb, 0, pTab->zName, 0);
    zWhere = sqlite3MPrintf("tbl_name=%Q", zName);
    sqlite3VdbeOp3(v, OP_ParseSchema, iDb, 0, zWhere, P3_DYNAMIC);
#ifndef SQLITE_OMIT_TRIGGER
    if( zTempTrig ){
      sqlite3VdbeOp3(v, OP_ParseSchema, 1, 0, zTempTrig, P3_DYNAMIC);
    }
  }else{
    sqliteFree(zTempTrig);
#endif
  }

exit_alter_table:
  sqlite3SrcListDelete(pSrc);
  sqliteFree(zName);
}
#endif








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**     CREATE INDEX
**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**
** $Id: build.c,v 1.311 2005/02/15 20:47:57 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Initialize the pParse structure as needed.
................................................................................
  if( pIndex ){
    sqlite3BeginWriteOperation(pParse, 0, iDb);
    sqlite3RefillIndex(pParse, pIndex, -1);
    return;
  }
  sqlite3ErrorMsg(pParse, "unable to identify the object to be reindexed");
}
#endif

Changes to src/func.c. 

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** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.94 2005/02/09 01:40:25 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
................................................................................
/*
** This function is used by SQL generated to implement the 
** ALTER TABLE command. The first argument is the text of a CREATE TABLE or
** CREATE INDEX command. The second is a table name. The table name in 
** the CREATE TABLE or CREATE INDEX statement is replaced with the second
** argument and the result returned. Examples:
**
** sqlite_alter_table('CREATE TABLE abc(a, b, c)', 'def')
**     -> 'CREATE TABLE def(a, b, c)'
**
** sqlite_alter_table('CREATE INDEX i ON abc(a)', 'def')
**     -> 'CREATE INDEX i ON def(a, b, c)'
*/
static void altertableFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  unsigned char const *zSql = sqlite3_value_text(argv[0]);
  unsigned char const *zTableName = sqlite3_value_text(argv[1]);

................................................................................

#ifndef SQLITE_OMIT_ALTERTABLE
#ifndef SQLITE_OMIT_TRIGGER
/* This function is used by SQL generated to implement the ALTER TABLE
** ALTER TABLE command. The first argument is the text of a CREATE TRIGGER 
** statement. The second is a table name. The table name in the CREATE 
** TRIGGER statement is replaced with the second argument and the result 
** returned. This is analagous to altertableFunc() above, except for CREATE
** TRIGGER, not CREATE INDEX and CREATE TABLE.
*/
static void altertriggerFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  unsigned char const *zSql = sqlite3_value_text(argv[0]);
  unsigned char const *zTableName = sqlite3_value_text(argv[1]);

................................................................................
    { "nullif",             2, 0, SQLITE_UTF8,    1, nullifFunc },
    { "sqlite_version",     0, 0, SQLITE_UTF8,    0, versionFunc},
    { "quote",              1, 0, SQLITE_UTF8,    0, quoteFunc  },
    { "last_insert_rowid",  0, 1, SQLITE_UTF8,    0, last_insert_rowid },
    { "changes",            0, 1, SQLITE_UTF8,    0, changes    },
    { "total_changes",      0, 1, SQLITE_UTF8,    0, total_changes },
#ifndef SQLITE_OMIT_ALTERTABLE
    { "sqlite_alter_table", 2, 0, SQLITE_UTF8,    0, altertableFunc},
#ifndef SQLITE_OMIT_TRIGGER
    { "sqlite_alter_trigger", 2, 0, SQLITE_UTF8,  0, altertriggerFunc},
#endif
#endif
#ifdef SQLITE_SOUNDEX
    { "soundex",            1, 0, SQLITE_UTF8, 0, soundexFunc},
#endif
#ifdef SQLITE_TEST
    { "randstr",               2, 0, SQLITE_UTF8, 0, randStr    },








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** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.95 2005/02/15 20:47:57 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
................................................................................
/*
** This function is used by SQL generated to implement the 
** ALTER TABLE command. The first argument is the text of a CREATE TABLE or
** CREATE INDEX command. The second is a table name. The table name in 
** the CREATE TABLE or CREATE INDEX statement is replaced with the second
** argument and the result returned. Examples:
**
** sqlite_rename_table('CREATE TABLE abc(a, b, c)', 'def')
**     -> 'CREATE TABLE def(a, b, c)'
**
** sqlite_rename_table('CREATE INDEX i ON abc(a)', 'def')
**     -> 'CREATE INDEX i ON def(a, b, c)'
*/
static void renameTableFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  unsigned char const *zSql = sqlite3_value_text(argv[0]);
  unsigned char const *zTableName = sqlite3_value_text(argv[1]);

................................................................................

#ifndef SQLITE_OMIT_ALTERTABLE
#ifndef SQLITE_OMIT_TRIGGER
/* This function is used by SQL generated to implement the ALTER TABLE
** ALTER TABLE command. The first argument is the text of a CREATE TRIGGER 
** statement. The second is a table name. The table name in the CREATE 
** TRIGGER statement is replaced with the second argument and the result 
** returned. This is analagous to renameTableFunc() above, except for CREATE
** TRIGGER, not CREATE INDEX and CREATE TABLE.
*/
static void renameTriggerFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  unsigned char const *zSql = sqlite3_value_text(argv[0]);
  unsigned char const *zTableName = sqlite3_value_text(argv[1]);

................................................................................
    { "nullif",             2, 0, SQLITE_UTF8,    1, nullifFunc },
    { "sqlite_version",     0, 0, SQLITE_UTF8,    0, versionFunc},
    { "quote",              1, 0, SQLITE_UTF8,    0, quoteFunc  },
    { "last_insert_rowid",  0, 1, SQLITE_UTF8,    0, last_insert_rowid },
    { "changes",            0, 1, SQLITE_UTF8,    0, changes    },
    { "total_changes",      0, 1, SQLITE_UTF8,    0, total_changes },
#ifndef SQLITE_OMIT_ALTERTABLE
    { "sqlite_rename_table",  2, 0, SQLITE_UTF8,  0, renameTableFunc},
#ifndef SQLITE_OMIT_TRIGGER
    { "sqlite_rename_trigger",2, 0, SQLITE_UTF8,  0, renameTriggerFunc},
#endif
#endif
#ifdef SQLITE_SOUNDEX
    { "soundex",            1, 0, SQLITE_UTF8, 0, soundexFunc},
#endif
#ifdef SQLITE_TEST
    { "randstr",               2, 0, SQLITE_UTF8, 0, randStr    },

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