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Flag pragmas like vdbe_trace now return their current setting if they

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are called with no arguments. (CVS 1257)

FossilOrigin-Name: 6a5fb5b89a98307060bb4a92a499b5d3dba74553
This commit is contained in:
drh
2004-02-21 14:00:29 +00:00
parent 905793e249
commit 8722318f3c
3 changed files with 53 additions and 55 deletions
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94
src/pragma.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.16 2004/02/21 13:31:10 drh Exp $
** $Id: pragma.c,v 1.17 2004/02/21 14:00:29 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -19,7 +19,7 @@
/*
** Interpret the given string as a boolean value.
*/
static int getBoolean(char *z){
static int getBoolean(const char *z){
static char *azTrue[] = { "yes", "on", "true" };
int i;
if( z[0]==0 ) return 0;
@@ -83,6 +83,46 @@ static int getTempStore(char *z){
}
}
/*
** Check to see if zRight and zLeft refer to a pragma that queries
** or changes one of the flags in db->flags. Return 1 if so and 0 if not.
** Also, implement the pragma.
*/
static int flagPragma(Parse *pParse, const char *zLeft, const char *zRight){
static const struct {
const char *zName; /* Name of the pragma */
int mask; /* Mask for the db->flags value */
} aPragma[] = {
{ "vdbe_trace", SQLITE_VdbeTrace },
{ "full_column_names", SQLITE_FullColNames },
{ "short_column_names", SQLITE_ShortColNames },
{ "show_datatypes", SQLITE_ReportTypes },
{ "count_changes", SQLITE_CountRows },
{ "empty_result_callbacks", SQLITE_NullCallback },
};
int i;
for(i=0; i<sizeof(aPragma)/sizeof(aPragma[0]); i++){
if( sqliteStrICmp(zLeft, aPragma[i].zName)==0 ){
sqlite *db = pParse->db;
Vdbe *v;
if( strcmp(zLeft,zRight)==0 && (v = sqliteGetVdbe(pParse))!=0 ){
sqliteVdbeAddOp(v, OP_ColumnName, 0, 1);
sqliteVdbeChangeP3(v, -1, aPragma[i].zName, P3_STATIC);
sqliteVdbeAddOp(v, OP_ColumnName, 1, 0);
sqliteVdbeChangeP3(v, -1, "boolean", P3_STATIC);
sqliteVdbeAddOp(v, OP_Integer, (db->flags & aPragma[i].mask)!=0, 0);
sqliteVdbeAddOp(v, OP_Callback, 1, 0);
}else if( getBoolean(zRight) ){
db->flags |= aPragma[i].mask;
}else{
db->flags &= ~aPragma[i].mask;
}
return 1;
}
}
return 0;
}
/*
** Process a pragma statement.
**
@@ -287,6 +327,7 @@ void sqlitePragma(Parse *pParse, Token *pLeft, Token *pRight, int minusFlag){
}
}else
#ifndef NDEBUG
if( sqliteStrICmp(zLeft, "trigger_overhead_test")==0 ){
if( getBoolean(zRight) ){
always_code_trigger_setup = 1;
@@ -294,53 +335,10 @@ void sqlitePragma(Parse *pParse, Token *pLeft, Token *pRight, int minusFlag){
always_code_trigger_setup = 0;
}
}else
#endif
if( sqliteStrICmp(zLeft, "vdbe_trace")==0 ){
if( getBoolean(zRight) ){
db->flags |= SQLITE_VdbeTrace;
}else{
db->flags &= ~SQLITE_VdbeTrace;
}
}else
if( sqliteStrICmp(zLeft, "full_column_names")==0 ){
if( getBoolean(zRight) ){
db->flags |= SQLITE_FullColNames;
}else{
db->flags &= ~SQLITE_FullColNames;
}
}else
if( sqliteStrICmp(zLeft, "short_column_names")==0 ){
if( getBoolean(zRight) ){
db->flags |= SQLITE_ShortColNames;
}else{
db->flags &= ~SQLITE_ShortColNames;
}
}else
if( sqliteStrICmp(zLeft, "show_datatypes")==0 ){
if( getBoolean(zRight) ){
db->flags |= SQLITE_ReportTypes;
}else{
db->flags &= ~SQLITE_ReportTypes;
}
}else
if( sqliteStrICmp(zLeft, "count_changes")==0 ){
if( getBoolean(zRight) ){
db->flags |= SQLITE_CountRows;
}else{
db->flags &= ~SQLITE_CountRows;
}
}else
if( sqliteStrICmp(zLeft, "empty_result_callbacks")==0 ){
if( getBoolean(zRight) ){
db->flags |= SQLITE_NullCallback;
}else{
db->flags &= ~SQLITE_NullCallback;
}
if( flagPragma(pParse, zLeft, zRight) ){
/* The flagPragma() call also generates any necessary code */
}else
if( sqliteStrICmp(zLeft, "table_info")==0 ){