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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Turn of the reporting of datatypes in the 4th callback argument unless the SHOW_DATATYPES pragma is ON. Eliminate the NULL pointer that used to separate the beginning of datatypes from the end of column names so that the callback can test to see whether or not datatypes are provided. This is an incompatible changes, but since the prior behavior was never documented, we will let it in. (CVS 670)
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SHA1: b98727246d5fcc1b097b577be498a77e954c5dc4
User & Date: drh 2002-07-11 12:18:16
Context
2002-07-13
03:11
Fix for ticket #95: Do not allow automatically created indices (associated with UNIQUE or PRIMARY KEY constraints) to be dropped. (CVS 671) check-in: 0603eb74 user: drh tags: trunk
2002-07-11
12:18
Turn of the reporting of datatypes in the 4th callback argument unless the SHOW_DATATYPES pragma is ON. Eliminate the NULL pointer that used to separate the beginning of datatypes from the end of column names so that the callback can test to see whether or not datatypes are provided. This is an incompatible changes, but since the prior behavior was never documented, we will let it in. (CVS 670) check-in: b9872724 user: drh tags: trunk
2002-07-10
21:26
When reporting back the datatype of columns, use the text of the datatype as it appears in the CREATE TABLE statement, if available. Also: removed the ".reindex" command from the shell. (CVS 669) check-in: ff8b6f4e user: drh tags: trunk
Changes
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Changes to src/build.c. 

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**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.102 2002/07/08 22:03:32 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
................................................................................
  if( sqliteStrICmp(zLeft, "full_column_names")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_FullColNames;
    }else{
      db->flags &= ~SQLITE_FullColNames;
    }
  }else









  if( sqliteStrICmp(zLeft, "result_set_details")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_ResultDetails;
    }else{
      db->flags &= ~SQLITE_ResultDetails;
    }








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**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.103 2002/07/11 12:18:16 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
................................................................................
  if( sqliteStrICmp(zLeft, "full_column_names")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_FullColNames;
    }else{
      db->flags &= ~SQLITE_FullColNames;
    }
  }else

  if( sqliteStrICmp(zLeft, "show_datatypes")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_ReportTypes;
    }else{
      db->flags &= ~SQLITE_ReportTypes;
    }
  }else

  if( sqliteStrICmp(zLeft, "result_set_details")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_ResultDetails;
    }else{
      db->flags &= ~SQLITE_ResultDetails;
    }

Changes to src/select.c. 

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**    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 SELECT statements in SQLite.
**
** $Id: select.c,v 1.104 2002/07/10 21:26:01 drh Exp $
*/
#include "sqliteInt.h"

/*
** Allocate a new Select structure and return a pointer to that
** structure.
*/
................................................................................
  SrcList *pTabList,  /* List of tables */
  ExprList *pEList    /* Expressions defining the result set */
){
  Vdbe *v = pParse->pVdbe;
  int i;
  if( pParse->colNamesSet || v==0 || sqlite_malloc_failed ) return;
  pParse->colNamesSet = 1;

  sqliteVdbeAddOp(v, OP_ColumnCount, pEList->nExpr*2+1, 0);



  for(i=0; i<pEList->nExpr; i++){
    Expr *p;
    char *zType = 0;
    int showFullNames;
    if( pEList->a[i].zName ){
      char *zName = pEList->a[i].zName;
      sqliteVdbeAddOp(v, OP_ColumnName, i, 0);
................................................................................
    }else{
      char zName[30];
      assert( p->op!=TK_COLUMN || pTabList==0 );
      sprintf(zName, "column%d", i+1);
      sqliteVdbeAddOp(v, OP_ColumnName, i, 0);
      sqliteVdbeChangeP3(v, -1, zName, strlen(zName));
    }

    if( zType==0 ){
      if( sqliteExprType(p)==SQLITE_SO_TEXT ){
        zType = "TEXT";
      }else{
        zType = "NUMERIC";
      }
    }
    sqliteVdbeAddOp(v, OP_ColumnName, i + pEList->nExpr + 1, 0);
    sqliteVdbeChangeP3(v, -1, zType, P3_STATIC);

  }
}

/*
** Name of the connection operator, used for error messages.
*/
static const char *selectOpName(int id){








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**    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 SELECT statements in SQLite.
**
** $Id: select.c,v 1.105 2002/07/11 12:18:17 drh Exp $
*/
#include "sqliteInt.h"

/*
** Allocate a new Select structure and return a pointer to that
** structure.
*/
................................................................................
  SrcList *pTabList,  /* List of tables */
  ExprList *pEList    /* Expressions defining the result set */
){
  Vdbe *v = pParse->pVdbe;
  int i;
  if( pParse->colNamesSet || v==0 || sqlite_malloc_failed ) return;
  pParse->colNamesSet = 1;
  if( pParse->db->flags & SQLITE_ReportTypes ){
    sqliteVdbeAddOp(v, OP_ColumnCount, pEList->nExpr*2, 0);
  }else{
    sqliteVdbeAddOp(v, OP_ColumnCount, pEList->nExpr, 0);
  }
  for(i=0; i<pEList->nExpr; i++){
    Expr *p;
    char *zType = 0;
    int showFullNames;
    if( pEList->a[i].zName ){
      char *zName = pEList->a[i].zName;
      sqliteVdbeAddOp(v, OP_ColumnName, i, 0);
................................................................................
    }else{
      char zName[30];
      assert( p->op!=TK_COLUMN || pTabList==0 );
      sprintf(zName, "column%d", i+1);
      sqliteVdbeAddOp(v, OP_ColumnName, i, 0);
      sqliteVdbeChangeP3(v, -1, zName, strlen(zName));
    }
    if( pParse->db->flags & SQLITE_ReportTypes ){
      if( zType==0 ){
        if( sqliteExprType(p)==SQLITE_SO_TEXT ){
          zType = "TEXT";
        }else{
          zType = "NUMERIC";
        }
      }
      sqliteVdbeAddOp(v, OP_ColumnName, i + pEList->nExpr, 0);
      sqliteVdbeChangeP3(v, -1, zType, P3_STATIC);
    }
  }
}

/*
** Name of the connection operator, used for error messages.
*/
static const char *selectOpName(int id){

Changes to src/sqliteInt.h. 

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**    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 1.135 2002/07/08 22:03:32 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
#include <stdio.h>
................................................................................
                                          /*   DELETE, or UPDATE and return */
                                          /*   the count using a callback. */
#define SQLITE_NullCallback   0x00000080  /* Invoke the callback once if the */
                                          /*   result set is empty */
#define SQLITE_ResultDetails  0x00000100  /* Details added to result set */
#define SQLITE_UnresetViews   0x00000200  /* True if one or more views have */
                                          /*   defined column names */



/*
** Possible values for the sqlite.magic field.
** The numbers are obtained at random and have no special meaning, other
** than being distinct from one another.
*/
#define SQLITE_MAGIC_OPEN     0xa029a697  /* Database is open */








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**    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 1.136 2002/07/11 12:18:17 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
#include <stdio.h>
................................................................................
                                          /*   DELETE, or UPDATE and return */
                                          /*   the count using a callback. */
#define SQLITE_NullCallback   0x00000080  /* Invoke the callback once if the */
                                          /*   result set is empty */
#define SQLITE_ResultDetails  0x00000100  /* Details added to result set */
#define SQLITE_UnresetViews   0x00000200  /* True if one or more views have */
                                          /*   defined column names */
#define SQLITE_ReportTypes    0x00000400  /* Include information on datatypes */
                                          /*   in 4th argument of callback */

/*
** Possible values for the sqlite.magic field.
** The numbers are obtained at random and have no special meaning, other
** than being distinct from one another.
*/
#define SQLITE_MAGIC_OPEN     0xa029a697  /* Database is open */

Changes to src/tclsqlite.c. 

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**    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.
**
*************************************************************************
** A TCL Interface to SQLite
**
** $Id: tclsqlite.c,v 1.37 2002/07/10 21:26:01 drh Exp $
*/
#ifndef NO_TCL     /* Omit this whole file if TCL is unavailable */

#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>
................................................................................
      cbData->azColName[i] = malloc( Tcl_DStringLength(&dCol) + 1 );
      if( cbData->azColName[i] ){
        strcpy(cbData->azColName[i], Tcl_DStringValue(&dCol));
      }else{
        return 1;
      }
      if( cbData->zArray[0] ){
        Tcl_DString dType;
        Tcl_DStringInit(&dType);
        Tcl_SetVar2(cbData->interp, cbData->zArray, "*",
             Tcl_DStringValue(&dCol), TCL_LIST_ELEMENT|TCL_APPEND_VALUE);



        Tcl_DStringAppend(&dType, "typeof:", -1);
        Tcl_DStringAppend(&dType, Tcl_DStringValue(&dCol), -1);
        Tcl_DStringFree(&dCol);
        Tcl_ExternalToUtfDString(NULL, azN[i+argc+1], -1, &dCol);
        Tcl_SetVar2(cbData->interp, cbData->zArray, 
             Tcl_DStringValue(&dType), Tcl_DStringValue(&dCol),
             TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
        Tcl_DStringFree(&dType);

      }
      
      Tcl_DStringFree(&dCol);
    }
  }
  if( azCol!=0 ){
    if( cbData->zArray[0] ){
................................................................................
  char ** azN            /* Name for each column */
){
  CallbackData *cbData = (CallbackData*)clientData;
  int i, rc;
  if( azCol==0 || (cbData->once && cbData->zArray[0]) ){
    Tcl_SetVar2(cbData->interp, cbData->zArray, "*", "", 0);
    for(i=0; i<nCol; i++){
      char *z;
      Tcl_SetVar2(cbData->interp, cbData->zArray, "*", azN[i],
         TCL_LIST_ELEMENT|TCL_APPEND_VALUE);

      z = sqlite_mprintf("typeof:%s", azN[i]);
      Tcl_SetVar2(cbData->interp, cbData->zArray, z, azN[i+nCol+1],
         TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
      sqlite_freemem(z);

    }
    cbData->once = 0;
  }
  if( azCol!=0 ){
    if( cbData->zArray[0] ){
      for(i=0; i<nCol; i++){
        char *z = azCol[i];








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**    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.
**
*************************************************************************
** A TCL Interface to SQLite
**
** $Id: tclsqlite.c,v 1.38 2002/07/11 12:18:17 drh Exp $
*/
#ifndef NO_TCL     /* Omit this whole file if TCL is unavailable */

#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>
................................................................................
      cbData->azColName[i] = malloc( Tcl_DStringLength(&dCol) + 1 );
      if( cbData->azColName[i] ){
        strcpy(cbData->azColName[i], Tcl_DStringValue(&dCol));
      }else{
        return 1;
      }
      if( cbData->zArray[0] ){


        Tcl_SetVar2(cbData->interp, cbData->zArray, "*",
             Tcl_DStringValue(&dCol), TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
        if( azN[nCol]!=0 } {
          Tcl_DString dType;
          Tcl_DStringInit(&dType);
          Tcl_DStringAppend(&dType, "typeof:", -1);
          Tcl_DStringAppend(&dType, Tcl_DStringValue(&dCol), -1);
          Tcl_DStringFree(&dCol);
          Tcl_ExternalToUtfDString(NULL, azN[i+nCol], -1, &dCol);
          Tcl_SetVar2(cbData->interp, cbData->zArray, 
               Tcl_DStringValue(&dType), Tcl_DStringValue(&dCol),
               TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
          Tcl_DStringFree(&dType);
        }
      }
      
      Tcl_DStringFree(&dCol);
    }
  }
  if( azCol!=0 ){
    if( cbData->zArray[0] ){
................................................................................
  char ** azN            /* Name for each column */
){
  CallbackData *cbData = (CallbackData*)clientData;
  int i, rc;
  if( azCol==0 || (cbData->once && cbData->zArray[0]) ){
    Tcl_SetVar2(cbData->interp, cbData->zArray, "*", "", 0);
    for(i=0; i<nCol; i++){

      Tcl_SetVar2(cbData->interp, cbData->zArray, "*", azN[i],
         TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
      if( azN[nCol] ){
        char *z = sqlite_mprintf("typeof:%s", azN[i]);
        Tcl_SetVar2(cbData->interp, cbData->zArray, z, azN[i+nCol],
           TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
        sqlite_freemem(z);
      }
    }
    cbData->once = 0;
  }
  if( azCol!=0 ){
    if( cbData->zArray[0] ){
      for(i=0; i<nCol; i++){
        char *z = azCol[i];

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