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Have the sqlite_stmt table buffer all data for the current scan within the xFilter method.

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FossilOrigin-Name: 84a91c255e3d77728820561f16bdd9a87b7ff42b5430a9e13f404dfc3365c716
This commit is contained in:
dan 2022-06-29 15:16:48 +00:00
parent b0b734d145
commit e26f592ea5
3 changed files with 87 additions and 50 deletions
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121
ext/misc/stmt.c
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@ -30,6 +30,16 @@ SQLITE_EXTENSION_INIT1
#ifndef SQLITE_OMIT_VIRTUALTABLE
#define STMT_NUM_INTEGER_COLUMN 10
typedef struct StmtRow StmtRow;
struct StmtRow {
sqlite3_int64 iRowid; /* Rowid value */
char *zSql; /* column "sql" */
int aCol[STMT_NUM_INTEGER_COLUMN+1]; /* all other column values */
StmtRow *pNext; /* Next row to return */
};
/* stmt_vtab is a subclass of sqlite3_vtab which will
** serve as the underlying representation of a stmt virtual table
*/
@ -47,8 +57,7 @@ typedef struct stmt_cursor stmt_cursor;
struct stmt_cursor {
sqlite3_vtab_cursor base; /* Base class - must be first */
sqlite3 *db; /* Database connection for this cursor */
sqlite3_stmt *pStmt; /* Statement cursor is currently pointing at */
sqlite3_int64 iRowid; /* The rowid */
StmtRow *pRow; /* Current row */
};
/*
@ -122,10 +131,21 @@ static int stmtOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
return SQLITE_OK;
}
static void stmtCsrReset(stmt_cursor *pCur){
StmtRow *pRow = 0;
StmtRow *pNext = 0;
for(pRow=pCur->pRow; pRow; pRow=pNext){
pNext = pRow->pNext;
sqlite3_free(pRow);
}
pCur->pRow = 0;
}
/*
** Destructor for a stmt_cursor.
*/
static int stmtClose(sqlite3_vtab_cursor *cur){
stmtCsrReset((stmt_cursor*)cur);
sqlite3_free(cur);
return SQLITE_OK;
}
@ -136,8 +156,9 @@ static int stmtClose(sqlite3_vtab_cursor *cur){
*/
static int stmtNext(sqlite3_vtab_cursor *cur){
stmt_cursor *pCur = (stmt_cursor*)cur;
pCur->iRowid++;
pCur->pStmt = sqlite3_next_stmt(pCur->db, pCur->pStmt);
StmtRow *pNext = pCur->pRow->pNext;
sqlite3_free(pCur->pRow);
pCur->pRow = pNext;
return SQLITE_OK;
}
@ -151,39 +172,11 @@ static int stmtColumn(
int i /* Which column to return */
){
stmt_cursor *pCur = (stmt_cursor*)cur;
switch( i ){
case STMT_COLUMN_SQL: {
sqlite3_result_text(ctx, sqlite3_sql(pCur->pStmt), -1, SQLITE_TRANSIENT);
break;
}
case STMT_COLUMN_NCOL: {
sqlite3_result_int(ctx, sqlite3_column_count(pCur->pStmt));
break;
}
case STMT_COLUMN_RO: {
sqlite3_result_int(ctx, sqlite3_stmt_readonly(pCur->pStmt));
break;
}
case STMT_COLUMN_BUSY: {
sqlite3_result_int(ctx, sqlite3_stmt_busy(pCur->pStmt));
break;
}
default: {
assert( i==STMT_COLUMN_MEM );
i = SQLITE_STMTSTATUS_MEMUSED +
STMT_COLUMN_NSCAN - SQLITE_STMTSTATUS_FULLSCAN_STEP;
/* Fall thru */
}
case STMT_COLUMN_NSCAN:
case STMT_COLUMN_NSORT:
case STMT_COLUMN_NAIDX:
case STMT_COLUMN_NSTEP:
case STMT_COLUMN_REPREP:
case STMT_COLUMN_RUN: {
sqlite3_result_int(ctx, sqlite3_stmt_status(pCur->pStmt,
i-STMT_COLUMN_NSCAN+SQLITE_STMTSTATUS_FULLSCAN_STEP, 0));
break;
}
StmtRow *pRow = pCur->pRow;
if( i==STMT_COLUMN_SQL ){
sqlite3_result_text(ctx, pRow->zSql, -1, SQLITE_TRANSIENT);
}else{
sqlite3_result_int(ctx, pRow->aCol[i]);
}
return SQLITE_OK;
}
@ -194,7 +187,7 @@ static int stmtColumn(
*/
static int stmtRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
stmt_cursor *pCur = (stmt_cursor*)cur;
*pRowid = pCur->iRowid;
*pRowid = pCur->pRow->iRowid;
return SQLITE_OK;
}
@ -204,7 +197,7 @@ static int stmtRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
*/
static int stmtEof(sqlite3_vtab_cursor *cur){
stmt_cursor *pCur = (stmt_cursor*)cur;
return pCur->pStmt==0;
return pCur->pRow==0;
}
/*
@ -219,9 +212,53 @@ static int stmtFilter(
int argc, sqlite3_value **argv
){
stmt_cursor *pCur = (stmt_cursor *)pVtabCursor;
pCur->pStmt = 0;
pCur->iRowid = 0;
return stmtNext(pVtabCursor);
sqlite3_stmt *p = 0;
sqlite3_int64 iRowid = 1;
StmtRow **ppRow = 0;
stmtCsrReset(pCur);
ppRow = &pCur->pRow;
for(p=sqlite3_next_stmt(pCur->db, 0); p; p=sqlite3_next_stmt(pCur->db, p)){
const char *zSql = sqlite3_sql(p);
int nSql = zSql ? strlen(zSql)+1 : 0;
StmtRow *pNew = (StmtRow*)sqlite3_malloc(sizeof(StmtRow) + nSql);
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, sizeof(StmtRow));
if( zSql ){
pNew->zSql = (char*)&pNew[1];
memcpy(pNew->zSql, zSql, nSql);
}
pNew->aCol[STMT_COLUMN_NCOL] = sqlite3_column_count(p);
pNew->aCol[STMT_COLUMN_RO] = sqlite3_stmt_readonly(p);
pNew->aCol[STMT_COLUMN_BUSY] = sqlite3_stmt_busy(p);
pNew->aCol[STMT_COLUMN_NSCAN] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_FULLSCAN_STEP, 0
);
pNew->aCol[STMT_COLUMN_NSORT] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_SORT, 0
);
pNew->aCol[STMT_COLUMN_NAIDX] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_AUTOINDEX, 0
);
pNew->aCol[STMT_COLUMN_NSTEP] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_VM_STEP, 0
);
pNew->aCol[STMT_COLUMN_REPREP] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_REPREPARE, 0
);
pNew->aCol[STMT_COLUMN_RUN] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_RUN, 0
);
pNew->aCol[STMT_COLUMN_MEM] = sqlite3_stmt_status(
p, SQLITE_STMTSTATUS_MEMUSED, 0
);
pNew->iRowid = iRowid++;
*ppRow = pNew;
ppRow = &pNew->pNext;
}
return SQLITE_OK;
}
/*

14
manifest
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@ -1,5 +1,5 @@
C Fix\sa\smissing\sdependency\sfor\sjson.lo\sin\sMakefile.in
D 2022-06-27T11:28:25.255
C Have\sthe\ssqlite_stmt\stable\sbuffer\sall\sdata\sfor\sthe\scurrent\sscan\swithin\sthe\sxFilter\smethod.
D 2022-06-29T15:16:48.039
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# Remove this line to create a well-formed Fossil manifest.

2
manifest.uuid
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@ -1 +1 @@
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