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Allow virtual tables to mark columns as 'hidden'. Hidden columns do not show

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up in "*" expansion, the implicit column list of an INSERT statement, or the results of a "PRAGMA table_info" statement. (CVS 4127)

FossilOrigin-Name: 7f887a6a00fdd6efc3740bd8a1731bb1abde087c
This commit is contained in:
danielk1977
2007-06-26 10:38:54 +00:00
parent 8605761506
commit 034ca14f81
8 changed files with 235 additions and 23 deletions
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40
src/vtab.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file contains code used to help implement virtual tables.
**
** $Id: vtab.c,v 1.47 2007/06/22 15:21:16 danielk1977 Exp $
** $Id: vtab.c,v 1.48 2007/06/26 10:38:55 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_VIRTUALTABLE
#include "sqliteInt.h"
@@ -376,6 +376,44 @@ static int vtabCallConstructor(
}
db->pVTab = 0;
sqliteFree(zModuleName);
/* If everything went according to plan, loop through the columns
** of the table to see if any of them contain the token "hidden".
** If so, set the Column.isHidden flag and remove the token from
** the type string.
*/
if( rc==SQLITE_OK ){
int iCol;
for(iCol=0; iCol<pTab->nCol; iCol++){
char *zType = pTab->aCol[iCol].zType;
int nType;
int i = 0;
if( !zType ) continue;
nType = strlen(zType);
if( sqlite3StrNICmp("hidden", zType, 6) || (zType[6] && zType[6]!=' ') ){
for(i=0; i<nType; i++){
if( (0==sqlite3StrNICmp(" hidden", &zType[i], 7))
&& (zType[i+7]=='\0' || zType[i+7]==' ')
){
i++;
break;
}
}
}
if( i<nType ){
int j;
int nDel = 6 + (zType[i+6] ? 1 : 0);
for(j=i; (j+nDel)<=nType; j++){
zType[j] = zType[j+nDel];
}
if( zType[i]=='\0' && i>0 ){
assert(zType[i-1]==' ');
zType[i-1] = '\0';
}
pTab->aCol[iCol].isHidden = 1;
}
}
}
return rc;
}