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Overview
Comment:Add the sqlite3_table_column_meta() API. (CVS 3062)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:1ac72f68c0e9fd63decc97c166f49b405a9d323c
User & Date: danielk1977 2006-02-09 13:43:29
Context
2006-02-09
16:52
Back out check-in (3058) - it breaks too much application code. (CVS 3063) check-in: 731f1e32 user: drh tags: trunk
13:43
Add the sqlite3_table_column_meta() API. (CVS 3062) check-in: 1ac72f68 user: danielk1977 tags: trunk
13:38
Avoid overflowing the 48-bit mantissa of a floating point number when summing large integers in the SUM() function. Ticket #1664. (CVS 3061) check-in: a9169e87 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/main.c.

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**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.333 2006/02/01 13:50:42 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** The following constant value is used by the SQLITE_BIGENDIAN and
................................................................................
void sqlite3_thread_cleanup(void){
  ThreadData *pTd = sqlite3OsThreadSpecificData(0);
  if( pTd ){
    memset(pTd, 0, sizeof(*pTd));
    sqlite3OsThreadSpecificData(-1);
  }
}

























































































































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**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.334 2006/02/09 13:43:29 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** The following constant value is used by the SQLITE_BIGENDIAN and
................................................................................
void sqlite3_thread_cleanup(void){
  ThreadData *pTd = sqlite3OsThreadSpecificData(0);
  if( pTd ){
    memset(pTd, 0, sizeof(*pTd));
    sqlite3OsThreadSpecificData(-1);
  }
}

/*
** Return meta information about a specific column of a database table.
** See comment in sqlite3.h (sqlite.h.in) for details.
*/
#ifdef SQLITE_ENABLE_COLUMN_METADATA
int sqlite3_table_column_metadata(
  sqlite3 *db,                /* Connection handle */
  const char *zDbName,        /* Database name or NULL */
  const char *zTableName,     /* Table name */
  const char *zColumnName,    /* Column name */
  char const **pzDataType,    /* OUTPUT: Declared data type */
  char const **pzCollSeq,     /* OUTPUT: Collation sequence name */
  int *pNotNull,              /* OUTPUT: True if NOT NULL constraint exists */
  int *pPrimaryKey,           /* OUTPUT: True if column part of PK */
  int *pAutoinc               /* OUTPUT: True if colums is auto-increment */
){
  int rc;
  char *zErrMsg = 0;
  Table *pTab = 0;
  Column *pCol = 0;
  int iCol;

  char const *zDataType = 0;
  char const *zCollSeq = 0;
  int notnull = 0;
  int primarykey = 0;
  int autoinc = 0;

  /* Ensure the database schema has been loaded */
  if( sqlite3SafetyOn(db) ){
    return SQLITE_MISUSE;
  }
  rc = sqlite3Init(db, &zErrMsg);
  if( SQLITE_OK!=rc ){
    goto error_out;
  }

  /* Locate the table in question */
  pTab = sqlite3FindTable(db, zTableName, zDbName);
  if( !pTab || pTab->pSelect ){
    pTab = 0;
    goto error_out;
  }

  /* Find the column for which info is requested */
  if( sqlite3IsRowid(zColumnName) ){
    iCol = pTab->iPKey;
    if( iCol>=0 ){
      pCol = &pTab->aCol[iCol];
    }
  }else{
    for(iCol=0; iCol<pTab->nCol; iCol++){
      pCol = &pTab->aCol[iCol];
      if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
        break;
      }
    }
    if( iCol==pTab->nCol ){
      pTab = 0;
      goto error_out;
    }
  }

  /* The following block stores the meta information that will be returned
  ** to the caller in local variables zDataType, zCollSeq, notnull, primarykey
  ** and autoinc. At this point there are two possibilities:
  ** 
  **     1. The specified column name was rowid", "oid" or "_rowid_" 
  **        and there is no explicitly declared IPK column. 
  **
  **     2. The table is not a view and the column name identified an 
  **        explicitly declared column. Copy meta information from *pCol.
  */ 
  if( pCol ){
    zDataType = pCol->zType;
    zCollSeq = pCol->zColl;
    notnull = (pCol->notNull?1:0);
    primarykey  = (pCol->isPrimKey?1:0);
    autoinc = ((pTab->iPKey==iCol && pTab->autoInc)?1:0);
  }else{
    zDataType = "INTEGER";
    primarykey = 1;
  }
  if( !zCollSeq ){
    zCollSeq = "BINARY";
  }

error_out:
  if( sqlite3SafetyOff(db) ){
    rc = SQLITE_MISUSE;
  }

  /* Whether the function call succeeded or failed, set the output parameters
  ** to whatever their local counterparts contain. If an error did occur,
  ** this has the effect of zeroing all output parameters.
  */
  if( pzDataType ) *pzDataType = zDataType;
  if( pzCollSeq ) *pzCollSeq = zCollSeq;
  if( pNotNull ) *pNotNull = notnull;
  if( pPrimaryKey ) *pPrimaryKey = primarykey;
  if( pAutoinc ) *pAutoinc = autoinc;

  if( SQLITE_OK==rc && !pTab ){
    sqlite3SetString(&zErrMsg, "no such table column: ", zTableName, ".", 
        zColumnName, 0);
    rc = SQLITE_ERROR;
  }
  sqlite3Error(db, rc, (zErrMsg?"%s":0), zErrMsg);
  sqliteFree(zErrMsg);
  return sqlite3ApiExit(db, rc);
}
#endif

Changes to src/sqlite.h.in.

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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.157 2006/01/31 20:49:13 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
** will be automatically deallocated once memory-management and
** shared-cache are disabled and the soft heap limit has been set
** to zero.  This routine is provided as a convenience for users who
** want to make absolutely sure they have not forgotten something
** prior to killing off a thread.
*/
void sqlite3_thread_cleanup(void);



































































/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif







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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.158 2006/02/09 13:43:29 danielk1977 Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
** will be automatically deallocated once memory-management and
** shared-cache are disabled and the soft heap limit has been set
** to zero.  This routine is provided as a convenience for users who
** want to make absolutely sure they have not forgotten something
** prior to killing off a thread.
*/
void sqlite3_thread_cleanup(void);

/*
** Return meta information about a specific column of a specific database
** table accessible using the connection handle passed as the first function 
** argument.
**
** The column is identified by the second, third and fourth parameters to 
** this function. The second parameter is either the name of the database
** (i.e. "main", "temp" or an attached database) containing the specified
** table or NULL. If it is NULL, then all attached databases are searched
** for the table using the same algorithm as the database engine uses to 
** resolve unqualified table references.
**
** The third and fourth parameters to this function are the table and column 
** name of the desired column, respectively. Neither of these parameters 
** may be NULL.
**
** Meta information is returned by writing to the memory locations passed as
** the 5th and subsequent parameters to this function. Any of these 
** arguments may be NULL, in which case the corresponding element of meta 
** information is ommitted.
**
** Parameter     Output Type      Description
** -----------------------------------
**
**   5th         const char*      Data type
**   6th         const char*      Name of the default collation sequence 
**   7th         int              True if the column has a NOT NULL constraint
**   8th         int              True if the column is part of the PRIMARY KEY
**   9th         int              True if the column is AUTOINCREMENT
**
**
** The memory pointed to by the character pointers returned for the 
** declaration type and collation sequence is valid only until the next 
** call to any sqlite API function.
**
** If the specified table is actually a view, then an error is returned.
**
** If the specified column is "rowid", "oid" or "_rowid_" and an 
** INTEGER PRIMARY KEY column has been explicitly declared, then the output 
** parameters are set for the explicitly declared column. If there is no
** explicitly declared IPK column, then the output parameters are set as 
** follows:
**
**     data type: "INTEGER"
**     collation sequence: "BINARY"
**     not null: 0
**     primary key: 1
**     auto increment: 0
**
** This function may load one or more schemas from database files. If an
** error occurs during this process, or if the requested table or column
** cannot be found, an SQLITE error code is returned and an error message
** left in the database handle (to be retrieved using sqlite3_errmsg()).
*/
int sqlite3_table_column_metadata(
  sqlite3 *db,                /* Connection handle */
  const char *zDbName,        /* Database name or NULL */
  const char *zTableName,     /* Table name */
  const char *zColumnName,    /* Column name */
  char const **pzDataType,    /* OUTPUT: Declared data type */
  char const **pzCollSeq,     /* OUTPUT: Collation sequence name */
  int *pNotNull,              /* OUTPUT: True if NOT NULL constraint exists */
  int *pPrimaryKey,           /* OUTPUT: True if column part of PK */
  int *pAutoinc               /* OUTPUT: True if colums is auto-increment */
);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif

Changes to src/test1.c.

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**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.203 2006/01/24 10:58:22 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

................................................................................
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_libversion_number()));
  return TCL_OK;
}
























































/*
** Usage:  sqlite_abort
**
** Shutdown the process immediately.  This is not a clean shutdown.
** This command is used to test the recoverability of a database in
** the event of a program crash.
*/
................................................................................
#endif

#ifdef SQLITE_OMIT_CHECK
  Tcl_SetVar2(interp, "sqlite_options", "check", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "check", "1", TCL_GLOBAL_ONLY);
#endif







#ifdef SQLITE_OMIT_COMPLETE
  Tcl_SetVar2(interp, "sqlite_options", "complete", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "complete", "1", TCL_GLOBAL_ONLY);
#endif

................................................................................
#endif
     { "sqlite3_test_errstr",     test_errstr, 0             },
     { "tcl_variable_type",       tcl_variable_type, 0       },
#ifndef SQLITE_OMIT_SHARED_CACHE
     { "sqlite3_enable_shared_cache", test_enable_shared, 0  },
#endif
     { "sqlite3_libversion_number", test_libversion_number, 0  },



  };
  static int bitmask_size = sizeof(Bitmask)*8;
  int i;
  extern int sqlite3_os_trace;
  extern int sqlite3_where_trace;
  extern int sqlite3_sync_count, sqlite3_fullsync_count;
  extern int sqlite3_opentemp_count;







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**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.204 2006/02/09 13:43:29 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

................................................................................
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_libversion_number()));
  return TCL_OK;
}

/*
** Usage: sqlite3_table_column_metadata DB dbname tblname colname
**
*/
#ifdef SQLITE_ENABLE_COLUMN_METADATA
static int test_table_column_metadata(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  sqlite3 *db;
  const char *zDb;
  const char *zTbl;
  const char *zCol;
  int rc;
  Tcl_Obj *pRet;

  const char *zDatatype;
  const char *zCollseq;
  int notnull;
  int primarykey;
  int autoincrement;

  if( objc!=5 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB dbname tblname colname");
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  zDb = Tcl_GetString(objv[2]);
  zTbl = Tcl_GetString(objv[3]);
  zCol = Tcl_GetString(objv[4]);

  if( strlen(zDb)==0 ) zDb = 0;

  rc = sqlite3_table_column_metadata(db, zDb, zTbl, zCol, 
      &zDatatype, &zCollseq, &notnull, &primarykey, &autoincrement);

  if( rc!=SQLITE_OK ){
    Tcl_AppendResult(interp, sqlite3_errmsg(db), 0);
    return TCL_ERROR;
  }

  pRet = Tcl_NewObj();
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewStringObj(zDatatype, -1));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewStringObj(zCollseq, -1));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(notnull));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(primarykey));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(autoincrement));
  Tcl_SetObjResult(interp, pRet);

  return TCL_OK;
}
#endif

/*
** Usage:  sqlite_abort
**
** Shutdown the process immediately.  This is not a clean shutdown.
** This command is used to test the recoverability of a database in
** the event of a program crash.
*/
................................................................................
#endif

#ifdef SQLITE_OMIT_CHECK
  Tcl_SetVar2(interp, "sqlite_options", "check", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "check", "1", TCL_GLOBAL_ONLY);
#endif

#ifdef SQLITE_ENABLE_COLUMN_METADATA
  Tcl_SetVar2(interp, "sqlite_options", "columnmetadata", "1", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "columnmetadata", "0", TCL_GLOBAL_ONLY);
#endif

#ifdef SQLITE_OMIT_COMPLETE
  Tcl_SetVar2(interp, "sqlite_options", "complete", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "complete", "1", TCL_GLOBAL_ONLY);
#endif

................................................................................
#endif
     { "sqlite3_test_errstr",     test_errstr, 0             },
     { "tcl_variable_type",       tcl_variable_type, 0       },
#ifndef SQLITE_OMIT_SHARED_CACHE
     { "sqlite3_enable_shared_cache", test_enable_shared, 0  },
#endif
     { "sqlite3_libversion_number", test_libversion_number, 0  },
#ifdef SQLITE_ENABLE_COLUMN_METADATA
     { "sqlite3_table_column_metadata", test_table_column_metadata, 0  },
#endif
  };
  static int bitmask_size = sizeof(Bitmask)*8;
  int i;
  extern int sqlite3_os_trace;
  extern int sqlite3_where_trace;
  extern int sqlite3_sync_count, sqlite3_fullsync_count;
  extern int sqlite3_opentemp_count;

Added test/colmeta.test.



























































































































































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#
# 2006 February 9
#
# 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 script is the sqlite3_table_column_metadata() API.
#
# $Id: colmeta.test,v 1.1 2006/02/09 13:43:29 danielk1977 Exp $

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

ifcapable !columnmetadata {
  finish_test
  return
}

# Set up a schema in the main and temp test databases.
do_test colmeta-0 {
  execsql {
    CREATE TABLE abc(a, b, c);
    CREATE TABLE abc2(a PRIMARY KEY COLLATE NOCASE, b VARCHAR(32), c);
    CREATE TABLE abc3(a NOT NULL, b INTEGER PRIMARY KEY, c);
    CREATE TABLE abc4(a, b INTEGER PRIMARY KEY AUTOINCREMENT, c);
    CREATE VIEW v1 AS SELECT * FROM abc2;
  }
} {}

# Return values are of the form:
#
#   {<decl-type> <collation> <not null> <primary key> <auto increment>}
#
set tests {
  1  {main abc a}                {0 {{} BINARY 0 0 0}}
  2  {{} abc a}                  {0 {{} BINARY 0 0 0}}
  3  {{} abc2 b}                 {0 {VARCHAR(32) BINARY 0 0 0}}
  4  {main abc2 b}               {0 {VARCHAR(32) BINARY 0 0 0}}
  5  {{} abc2 a}                 {0 {{} NOCASE 0 1 0}}
  6  {{} abc3 a}                 {0 {{} BINARY 1 0 0}}
  7  {{} abc3 b}                 {0 {INTEGER BINARY 0 1 0}}
  8  {{} abc4 b}                 {0 {INTEGER BINARY 0 1 1}}
  9  {{} v1 a}                   {1 {no such table column: v1.a}}
  10 {main v1 b}                 {1 {no such table column: v1.b}}
  11 {main v1 badname}           {1 {no such table column: v1.badname}}
  12 {main v1 rowid}             {1 {no such table column: v1.rowid}}
  13 {main abc rowid}            {0 {INTEGER BINARY 0 1 0}}
  14 {main abc3 rowid}           {0 {INTEGER BINARY 0 1 0}}
  14 {main abc4 rowid}           {0 {INTEGER BINARY 0 1 1}}
}

foreach {tn params results} $tests {
  set ::DB [sqlite3_connection_pointer db]

  set tstbody [concat sqlite3_table_column_metadata $::DB $params] 
  do_test colmeta-$tn.1 {
    list [catch $tstbody msg] [set msg]
  } $results

  db close
  sqlite3 db test.db

  set ::DB [sqlite3_connection_pointer db]
  set tstbody [concat sqlite3_table_column_metadata $::DB $params] 
  do_test colmeta-$tn.2 {
    list [catch $tstbody msg] [set msg]
  } $results
}

finish_test