database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-05 04:30:38 +03:00
Code Activity

Add the ".scanstats on" command to the shell tool. Executing this command causes the shell tool to print values from sqlite3_stmt_scanstatus() after each query is run.

Browse Source 
FossilOrigin-Name: 7974c0ed10ffdc960a43fed89845c2bed428958d
This commit is contained in:
dan
2014-11-05 09:07:28 +00:00
parent 547fb61807
commit 8d1edb92c4
3 changed files with 62 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
src/shell.c
View File

@@ -457,6 +457,7 @@ struct ShellState {
int echoOn; /* True to echo input commands */
int autoEQP; /* Run EXPLAIN QUERY PLAN prior to seach SQL stmt */
int statsOn; /* True to display memory stats before each finalize */
int scanstatsOn; /* True to display scan stats before each finalize */
int outCount; /* Revert to stdout when reaching zero */
int cnt; /* Number of records displayed so far */
FILE *out; /* Write results here */
@@ -1185,6 +1186,42 @@ static int display_stats(
return 0;
}
/*
** Display scan stats.
*/
static void display_scanstats(
sqlite3 *db, /* Database to query */
ShellState *pArg /* Pointer to ShellState */
){
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
int i;
fprintf(pArg->out, "-------- scanstats --------\n");
for(i=0; 1; i++){
sqlite3_stmt *p = pArg->pStmt;
sqlite3_int64 nEst, nLoop, nVisit;
const char *zExplain;
if( sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NLOOP, (void*)&nLoop) ){
break;
}
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EST, (void*)&nEst);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EXPLAIN, (void*)&zExplain);
fprintf(pArg->out, "Loop %d: \"%s\"\n", i, zExplain);
fprintf(pArg->out, " nLoop=%-8lld nVisit=%-8lld nEst=%-8lld\n",
nLoop, nVisit, nEst
);
}
#else
fprintf(pArg->out, "-------- scanstats --------\n");
fprintf(pArg->out,
"sqlite3_stmt_scanstatus() unavailable - "
"rebuild with SQLITE_ENABLE_STMT_SCANSTATUS\n"
);
#endif
fprintf(pArg->out, "---------------------------\n");
}
/*
** Parameter azArray points to a zero-terminated array of strings. zStr
** points to a single nul-terminated string. Return non-zero if zStr
@@ -1423,6 +1460,11 @@ static int shell_exec(
display_stats(db, pArg, 0);
}
/* print loop-counters if required */
if( pArg && pArg->scanstatsOn ){
display_scanstats(db, pArg);
}
/* Finalize the statement just executed. If this fails, save a
** copy of the error message. Otherwise, set zSql to point to the
** next statement to execute. */
@@ -3014,6 +3056,16 @@ static int do_meta_command(char *zLine, ShellState *p){
sqlite3_close(pSrc);
}else
if( c=='s' && strncmp(azArg[0], "scanstats", n)==0 ){
if( nArg==2 ){
p->scanstatsOn = booleanValue(azArg[1]);
}else{
fprintf(stderr, "Usage: .scanstats on|off\n");
rc = 1;
}
}else
if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
ShellState data;
char *zErrMsg = 0;
@@ -4140,6 +4192,8 @@ int main(int argc, char **argv){
data.autoEQP = 1;
}else if( strcmp(z,"-stats")==0 ){
data.statsOn = 1;
}else if( strcmp(z,"-scanstats")==0 ){
data.scanstatsOn = 1;
}else if( strcmp(z,"-bail")==0 ){
bail_on_error = 1;
}else if( strcmp(z,"-version")==0 ){