SQLite

**    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 1.21 2006/06/21 12:36:25 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** The code in this file only exists if we are not omitting the
** ALTER TABLE logic from the build.

#endif
  
  if( sqlite3MallocFailed() ) goto exit_rename_table;
  assert( pSrc->nSrc==1 );

  pTab = sqlite3LocateTable(pParse, pSrc->a[0].zName, pSrc->a[0].zDatabase);
  if( !pTab ) goto exit_rename_table;
#ifndef SQLITE_OMIT_VIRTUALTABLE
  if( IsVirtual(pTab) ){
    sqlite3ErrorMsg(pParse, "virtual tables may not be altered");
    goto exit_rename_table;
  }
#endif
  iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
  zDb = db->aDb[iDb].zName;

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

  int nAlloc;

  /* Look up the table being altered. */
  assert( pParse->pNewTable==0 );
  if( sqlite3MallocFailed() ) goto exit_begin_add_column;
  pTab = sqlite3LocateTable(pParse, pSrc->a[0].zName, pSrc->a[0].zDatabase);
  if( !pTab ) goto exit_begin_add_column;

#ifndef SQLITE_OMIT_VIRTUALTABLE
  if( IsVirtual(pTab) ){
    sqlite3ErrorMsg(pParse, "virtual tables may not be altered");
    goto exit_begin_add_column;
  }
#endif

  /* Make sure this is not an attempt to ALTER a view. */
  if( pTab->pSelect ){
    sqlite3ErrorMsg(pParse, "Cannot add a column to a view");
    goto exit_begin_add_column;
  }

**     CREATE INDEX
**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**
** $Id: build.c,v 1.407 2006/06/21 12:36:25 danielk1977 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.

    goto exit_create_index;
  }
#ifndef SQLITE_OMIT_VIEW
  if( pTab->pSelect ){
    sqlite3ErrorMsg(pParse, "views may not be indexed");
    goto exit_create_index;
  }
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
  if( IsVirtual(pTab) ){
    sqlite3ErrorMsg(pParse, "virtual tables may not be indexed");
    goto exit_create_index;
  }
#endif

  /*
  ** Find the name of the index.  Make sure there is not already another
  ** index or table with the same name.  
  **
  ** Exception:  If we are reading the names of permanent indices from the

# 2006 June 10
#
# 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 implements regression tests for SQLite library.
#
# $Id: vtab5.test,v 1.6 2006/06/21 12:36:26 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

ifcapable !vtab {
  finish_test
  return

do_test vtab5-1.1 {
  execsql {
    CREATE TABLE treal(a VARCHAR(16), b INTEGER, c FLOAT);
    INSERT INTO treal VALUES('a', 'b', 'c');
    CREATE VIRTUAL TABLE techo USING echo(treal);
  }
} {}

do_test vtab5.1.2 {
  execsql {
    SELECT * FROM techo;
  }
} {a b c}

do_test vtab5.1.3 {
  db close
  sqlite3 db test.db
  register_echo_module [sqlite3_connection_pointer db]
  execsql {
    INSERT INTO techo VALUES('c', 'd', 'e');
    SELECT * FROM techo;

    catchsql {
      CREATE TRIGGER trig BEFORE INSERT ON echo_strings BEGIN
        SELECT 1, 2, 3;
      END;
    }
  } {1 {cannot create triggers on virtual tables}}
}

# Test that it is impossible to create an index on a virtual table.
#
do_test vtab5.4.1 {
  catchsql {
    CREATE INDEX echo_strings_i ON echo_strings(str);
  }
} {1 {virtual tables may not be indexed}}

# Test that it is impossible to add a column to a virtual table.
#
do_test vtab5.4.2 {
  catchsql {
    ALTER TABLE echo_strings ADD COLUMN col2;
  }
} {1 {virtual tables may not be altered}}

# Test that it is impossible to add a column to a virtual table.
#
do_test vtab5.4.3 {
  catchsql {
    ALTER TABLE echo_strings RENAME TO echo_strings2;
  }
} {1 {virtual tables may not be altered}}

finish_test