database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-18 10:21:03 +03:00
Code Activity

Add the experimental sqlite3_stmt_scanstatus() API.

Browse Source 
FossilOrigin-Name: 6a9bab34aeb6a01b612211a28c140de60a3e883c
This commit is contained in:
dan
2014-10-31 20:11:32 +00:00
parent 0fb5daed34
commit 04489b6dce
12 changed files with 394 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
src/where.c
View File

@@ -2820,7 +2820,7 @@ static void explainOneScan(
int iFrom, /* Value for "from" column of output */
u16 wctrlFlags /* Flags passed to sqlite3WhereBegin() */
){
#ifndef SQLITE_DEBUG
#if !defined(SQLITE_DEBUG) && !defined(SQLITE_ENABLE_STMT_SCANSTATUS)
if( pParse->explain==2 )
#endif
{
@@ -2831,20 +2831,38 @@ static void explainOneScan(
int isSearch; /* True for a SEARCH. False for SCAN. */
WhereLoop *pLoop; /* The controlling WhereLoop object */
u32 flags; /* Flags that describe this loop */
char *zMsg; /* Text to add to EQP output */
StrAccum str; /* EQP output string */
char zBuf[100]; /* Initial space for EQP output string */
const char *zObj;
ExplainArg *pExplain;
i64 nEstRow; /* Estimated rows per scan of pLevel */
pLoop = pLevel->pWLoop;
flags = pLoop->wsFlags;
if( (flags&WHERE_MULTI_OR) || (wctrlFlags&WHERE_ONETABLE_ONLY) ) return;
sqlite3StrAccumInit(&str, zBuf, sizeof(zBuf), SQLITE_MAX_LENGTH);
str.db = db;
/* Reserve space at the start of the buffer managed by the StrAccum
** object for *pExplain. */
assert( sizeof(*pExplain)<=sizeof(zBuf) );
str.nChar = sizeof(*pExplain);
/* Append the object (table or index) name to the buffer. */
if( pItem->pSelect ){
zObj = "";
}else if( (flags & (WHERE_IPK|WHERE_VIRTUALTABLE))==0 ){
zObj = pLoop->u.btree.pIndex->zName;
}else{
zObj = pItem->zName;
}
sqlite3StrAccumAppend(&str, zObj, sqlite3Strlen30(zObj)+1);
/* Append the EQP text to the buffer */
isSearch = (flags&(WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))!=0
|| ((flags&WHERE_VIRTUALTABLE)==0 && (pLoop->u.btree.nEq>0))
|| (wctrlFlags&(WHERE_ORDERBY_MIN|WHERE_ORDERBY_MAX));
sqlite3StrAccumInit(&str, zBuf, sizeof(zBuf), SQLITE_MAX_LENGTH);
str.db = db;
sqlite3StrAccumAppendAll(&str, isSearch ? "SEARCH" : "SCAN");
if( pItem->pSelect ){
sqlite3XPrintf(&str, 0, " SUBQUERY %d", pItem->iSelectId);
@@ -2901,15 +2919,28 @@ static void explainOneScan(
pLoop->u.vtab.idxNum, pLoop->u.vtab.idxStr);
}
#endif
nEstRow = pLoop->nOut>=10 ? sqlite3LogEstToInt(pLoop->nOut) : 1;
#ifdef SQLITE_EXPLAIN_ESTIMATED_ROWS
if( pLoop->nOut>=10 ){
sqlite3XPrintf(&str, 0, " (~%llu rows)", sqlite3LogEstToInt(pLoop->nOut));
}else{
sqlite3StrAccumAppend(&str, " (~1 row)", 9);
}
sqlite3XPrintf(&str, 0, " (~%llu rows)", nEstRow);
#endif
zMsg = sqlite3StrAccumFinish(&str);
sqlite3VdbeAddOp4(v, OP_Explain, iId, iLevel, iFrom, zMsg, P4_DYNAMIC);
pExplain = (ExplainArg*)sqlite3StrAccumFinish(&str);
assert( pExplain || db->mallocFailed );
if( pExplain ){
memset(pExplain, 0, sizeof(*pExplain));
if( pLoop->wsFlags & WHERE_INDEXED ){
pExplain->iCsr = pLevel->iIdxCur;
}else if( pItem->pSelect==0 ){
pExplain->iCsr = pLevel->iTabCur;
}else{
pExplain->iCsr = -1;
}
pExplain->nEst = nEstRow;
pExplain->zName = (const char*)&pExplain[1];
pExplain->zExplain = &pExplain->zName[sqlite3Strlen30(pExplain->zName)+1];
sqlite3VdbeAddOp4(v, OP_Explain,
iId, iLevel, iFrom, (char*)pExplain,P4_EXPLAIN
);
}
}
}
#else