SQLite

**     CREATE INDEX
**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**
** $Id: build.c,v 1.362 2005/12/29 01:11:37 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.

#endif
}

/*
** This routine is called to do the work of a DROP TABLE statement.
** pName is the name of the table to be dropped.
*/
void sqlite3DropTable(Parse *pParse, SrcList *pName, int isView, int noErr){
  Table *pTab;
  Vdbe *v;
  sqlite3 *db = pParse->db;
  int iDb;

  if( pParse->nErr || sqlite3Tsd()->mallocFailed ) goto exit_drop_table;
  assert( pName->nSrc==1 );
  pTab = sqlite3LocateTable(pParse, pName->a[0].zName, pName->a[0].zDatabase);

  if( pTab==0 ){
    if( noErr ){
      sqlite3ErrorClear(pParse);
    }
    goto exit_drop_table;
  }
  iDb = pTab->iDb;
  assert( iDb>=0 && iDb<db->nDb );
#ifndef SQLITE_OMIT_AUTHORIZATION
  {
    int code;
    const char *zTab = SCHEMA_TABLE(pTab->iDb);
    const char *zDb = db->aDb[pTab->iDb].zName;

**
*************************************************************************
** 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 1.189 2005/12/29 01:11:37 drh 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.

  DATABASE DEFERRED DESC DETACH EACH END EXCLUSIVE EXPLAIN FAIL FOR
  IGNORE IMMEDIATE INITIALLY INSTEAD LIKE_KW MATCH PLAN QUERY KEY
  OF OFFSET PRAGMA RAISE REPLACE RESTRICT ROW STATEMENT
  TEMP TRIGGER VACUUM VIEW
%ifdef SQLITE_OMIT_COMPOUND_SELECT
  EXCEPT INTERSECT UNION
%endif
  REINDEX RENAME CTIME_KW IF
  .

// Define operator precedence early so that this is the first occurance
// of the operator tokens in the grammer.  Keeping the operators together
// causes them to be assigned integer values that are close together,
// which keeps parser tables smaller.
//

orconf(A) ::= OR resolvetype(X).             {A = X;}
resolvetype(A) ::= raisetype(X).             {A = X;}
resolvetype(A) ::= IGNORE.                   {A = OE_Ignore;}
resolvetype(A) ::= REPLACE.                  {A = OE_Replace;}

////////////////////////// The DROP TABLE /////////////////////////////////////
//
cmd ::= DROP TABLE ifexists(E) fullname(X). {
  sqlite3DropTable(pParse, X, 0, E);
}
%type ifexists {int}
ifexists(A) ::= IF EXISTS.   {A = 1;}
ifexists(A) ::= .            {A = 0;}

///////////////////// The CREATE VIEW statement /////////////////////////////
//
%ifndef SQLITE_OMIT_VIEW
cmd ::= CREATE(X) temp(T) VIEW nm(Y) dbnm(Z) AS select(S). {
  sqlite3CreateView(pParse, &X, &Y, &Z, S, T);
}
cmd ::= DROP VIEW ifexists(E) fullname(X). {
  sqlite3DropTable(pParse, X, 1, E);
}
%endif // SQLITE_OMIT_VIEW

//////////////////////// The SELECT statement /////////////////////////////////
//
cmd ::= select(X).  {
  sqlite3Select(pParse, X, SRT_Callback, 0, 0, 0, 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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.443 2005/12/29 01:11:37 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Many people are failing to set -DNDEBUG=1 when compiling SQLite.
** Setting NDEBUG makes the code smaller and run faster.  So the following

char *sqlite3MPrintf(const char*, ...);
char *sqlite3VMPrintf(const char*, va_list);
void sqlite3DebugPrintf(const char*, ...);
void *sqlite3TextToPtr(const char*);
void sqlite3SetString(char **, ...);
void sqlite3ErrorMsg(Parse*, const char*, ...);
void sqlite3ErrorClear(Parse*);
void sqlite3Dequote(char*);
void sqlite3DequoteExpr(Expr*);
int sqlite3KeywordCode(const unsigned char*, int);
int sqlite3RunParser(Parse*, const char*, char **);
void sqlite3FinishCoding(Parse*);
Expr *sqlite3Expr(int, Expr*, Expr*, const Token*);
Expr *sqlite3RegisterExpr(Parse*,Token*);

#ifndef SQLITE_OMIT_VIEW
  void sqlite3CreateView(Parse*,Token*,Token*,Token*,Select*,int);
  int sqlite3ViewGetColumnNames(Parse*,Table*);
#else
# define sqlite3ViewGetColumnNames(A,B) 0
#endif

void sqlite3DropTable(Parse*, SrcList*, int, int);
void sqlite3DeleteTable(sqlite3*, Table*);
void sqlite3Insert(Parse*, SrcList*, ExprList*, Select*, IdList*, int);
int sqlite3ArrayAllocate(void**,int,int);
IdList *sqlite3IdListAppend(IdList*, Token*);
int sqlite3IdListIndex(IdList*,const char*);
SrcList *sqlite3SrcListAppend(SrcList*, Token*, Token*);
void sqlite3SrcListAddAlias(SrcList*, Token*);

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.159 2005/12/29 01:11:37 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <stdarg.h>
#include <ctype.h>

/*

  va_list ap;
  pParse->nErr++;
  sqliteFree(pParse->zErrMsg);
  va_start(ap, zFormat);
  pParse->zErrMsg = sqlite3VMPrintf(zFormat, ap);
  va_end(ap);
}

/*
** Clear the error message in pParse, if any
*/
void sqlite3ErrorClear(Parse *pParse){
  sqliteFree(pParse->zErrMsg);
  pParse->zErrMsg = 0;
  pParse->nErr = 0;
}

/*
** Convert an SQL-style quoted string into a normal string by removing
** the quote characters.  The conversion is done in-place.  If the
** input does not begin with a quote character, then this routine
** is a no-op.
**

** by sqlite3MallocDisallow().
*/
void sqlite3MallocAllow(){
  assert(!sqlite3Tsd()->mallocAllowed);
  sqlite3Tsd()->mallocAllowed = 1;
}
#endif

# 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 implements regression tests for SQLite library.  The
# focus of this file is testing the CREATE TABLE statement.
#
# $Id: table.test,v 1.42 2005/12/29 01:11:37 drh Exp $

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

# Create a basic table and verify it is added to sqlite_master
#
do_test table-1.1 {

    execsql $sql
  }
  execsql {SELECT name FROM sqlite_master WHERE type!='meta' ORDER BY name}
} {}

# Try to drop a table that does not exist
#
do_test table-5.1.1 {
  catchsql {DROP TABLE test009}

} {1 {no such table: test009}}
do_test table-5.1.2 {
  catchsql {DROP TABLE IF EXISTS test009}
} {0 {}}

# Try to drop sqlite_master
#
do_test table-5.2 {
  catchsql {DROP TABLE IF EXISTS sqlite_master}

} {1 {table sqlite_master may not be dropped}}

# Make sure an EXPLAIN does not really create a new table
#
do_test table-5.3 {
  ifcapable {explain} {
    execsql {EXPLAIN CREATE TABLE test1(f1 int)}

  { "FOR",              "TK_FOR",          TRIGGER                },
  { "FOREIGN",          "TK_FOREIGN",      FKEY                   },
  { "FROM",             "TK_FROM",         ALWAYS                 },
  { "FULL",             "TK_JOIN_KW",      ALWAYS                 },
  { "GLOB",             "TK_LIKE_KW",      ALWAYS                 },
  { "GROUP",            "TK_GROUP",        ALWAYS                 },
  { "HAVING",           "TK_HAVING",       ALWAYS                 },
  { "IF",               "TK_IF",           ALWAYS                 },
  { "IGNORE",           "TK_IGNORE",       CONFLICT|TRIGGER       },
  { "IMMEDIATE",        "TK_IMMEDIATE",    ALWAYS                 },
  { "IN",               "TK_IN",           ALWAYS                 },
  { "INDEX",            "TK_INDEX",        ALWAYS                 },
  { "INITIALLY",        "TK_INITIALLY",    FKEY                   },
  { "INNER",            "TK_JOIN_KW",      ALWAYS                 },
  { "INSERT",           "TK_INSERT",       ALWAYS                 },

#
# Run this Tcl script to generate the lang-*.html files.
#
set rcsid {$Id: lang.tcl,v 1.103 2005/12/29 01:11:37 drh Exp $}
source common.tcl

if {[llength $argv]>0} {
  set outputdir [lindex $argv 0]
} else {
  set outputdir ""
}

will be freed automatically by DROP INDEX.</p>
}


Section {DROP TABLE} droptable

Syntax {sql-command} {
DROP TABLE [IF EXISTS] [<database-name>.] <table-name>
}

puts {
<p>The DROP TABLE statement removes a table added with the <a href=
"#createtable">CREATE TABLE</a> statement.  The name specified is the
table name.  It is completely removed from the database schema and the 
disk file.  The table can not be recovered.  All indices associated 
with the table are also deleted.</p>

<p>The DROP TABLE statement does not reduce the size of the database 
file in the default mode.  Empty space in the database is retained for
later INSERTs.  To 
remove free space in the database, use the <a href="#vacuum">VACUUM</a> 
command.  If AUTOVACUUM mode is enabled for a database then space
will be freed automatically by DROP TABLE.</p>

<p>The optional IF EXISTS clause suppresses the error that would normally
result if the table does not exist.</p>
}


Section {DROP TRIGGER} droptrigger
Syntax {sql-statement} {
DROP TRIGGER [<database-name> .] <trigger-name>
}