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Change sqlite3_blob_reopen() to call sqlite3VdbeExec() directly rather than

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going through sqlite3_step().  Performance enhancement.

FossilOrigin-Name: 347df3c1fd7322e7aacaf1e9f8be81830947c482
This commit is contained in:
drh
2017-01-21 16:27:56 +00:00
parent 184d902db1
commit 3b2936fada
3 changed files with 16 additions and 12 deletions
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14
src/vdbeblob.c
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@@ -26,7 +26,6 @@ struct Incrblob {
int nByte; /* Size of open blob, in bytes */
int iOffset; /* Byte offset of blob in cursor data */
u16 iCol; /* Table column this handle is open on */
u8 isPureKV; /* True if pTab is a pure key/value table */
BtCursor *pCsr; /* Cursor pointing at blob row */
sqlite3_stmt *pStmt; /* Statement holding cursor open */
sqlite3 *db; /* The associated database */
@@ -56,6 +55,7 @@ static int blobSeekToRow(Incrblob *p, sqlite3_int64 iRow, char **pzErr){
int rc; /* Error code */
char *zErr = 0; /* Error message */
Vdbe *v = (Vdbe *)p->pStmt;
sqlite3 *db = v->db;
/* Set the value of register r[1] in the SQL statement to integer iRow.
** This is done directly as a performance optimization
@@ -67,9 +67,14 @@ static int blobSeekToRow(Incrblob *p, sqlite3_int64 iRow, char **pzErr){
** then back it up to the point where it does the OP_SeekRowid. This could
** have been down with an extra OP_Goto, but simply setting the program
** counter is faster. */
if( v->pc>3 ) v->pc = 3;
rc = sqlite3_step(p->pStmt);
if( v->pc>3 ){
v->pc = 3;
db->nVdbeExec++;
rc = sqlite3VdbeExec((Vdbe*)p->pStmt);
db->nVdbeExec--;
}else{
rc = sqlite3_step(p->pStmt);
}
if( rc==SQLITE_ROW ){
VdbeCursor *pC = v->apCsr[0];
u32 type = pC->aType[p->iCol];
@@ -318,7 +323,6 @@ int sqlite3_blob_open(
}
}
pBlob->isPureKV = (pTab->nCol==2 && pTab->iPKey==0);
pBlob->iCol = iCol;
pBlob->db = db;
sqlite3BtreeLeaveAll(db);