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Add the ".info" command to the shell.

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FossilOrigin-Name: 0a3100a7f264ffce6078c35e341f2f0af6c09fbb
This commit is contained in:
drh
2015-02-06 14:19:44 +00:00
parent fe0e84c948
commit f7502f005e
3 changed files with 103 additions and 8 deletions
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96
src/shell.c
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@@ -1748,6 +1748,7 @@ static char zHelp[] =
".indices ?TABLE? Show names of all indices\n"
" If TABLE specified, only show indices for tables\n"
" matching LIKE pattern TABLE.\n"
".info Show status information about the database\n"
#ifdef SQLITE_ENABLE_IOTRACE
".iotrace FILE Enable I/O diagnostic logging to FILE\n"
#endif
@@ -2426,6 +2427,97 @@ static void output_reset(ShellState *p){
p->out = stdout;
}
/*
** Run an SQL command and return the single integer result.
*/
static int db_int(ShellState *p, const char *zSql){
sqlite3_stmt *pStmt;
int res = 0;
sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
res = sqlite3_column_int(pStmt,0);
}
sqlite3_finalize(pStmt);
return res;
}
/*
** Convert a 2-byte or 4-byte big-endian integer into a native integer
*/
unsigned int get2byteInt(unsigned char *a){
return (a[0]<<8) + a[1];
}
unsigned int get4byteInt(unsigned char *a){
return (a[0]<<24) + (a[1]<<16) + (a[2]<<8) + a[3];
}
/*
** Implementation of the ".info" command.
**
** Return 1 on error, 2 to exit, and 0 otherwise.
*/
static int shell_info_command(ShellState *p){
sqlite3_file *pFile;
int i;
unsigned char aHdr[100];
static const struct { const char *zName; int ofst; } aField[] = {
{ "file change counter:", 24 },
{ "database page count:", 28 },
{ "freelist page count:", 36 },
{ "schema cookie:", 40 },
{ "schema format:", 44 },
{ "default cache size:", 48 },
{ "autovacuum top root:", 52 },
{ "incremental vacuum:", 64 },
{ "text encoding:", 56 },
{ "user version:", 60 },
{ "application id:", 68 },
{ "software version:", 96 },
};
open_db(p, 0);
if( p->db==0 ) return 1;
sqlite3_file_control(p->db, "main", SQLITE_FCNTL_FILE_POINTER, &pFile);
if( pFile==0 || pFile->pMethods==0 || pFile->pMethods->xRead==0 ){
return 1;
}
i = pFile->pMethods->xRead(pFile, aHdr, 100, 0);
if( i!=SQLITE_OK ){
fprintf(stderr, "unable to read database header\n");
return 1;
}
i = get2byteInt(aHdr+16);
if( i==1 ) i = 65536;
fprintf(p->out, "%-20s %d\n", "database page size:", i);
fprintf(p->out, "%-20s %d\n", "write format:", aHdr[18]);
fprintf(p->out, "%-20s %d\n", "read format:", aHdr[19]);
fprintf(p->out, "%-20s %d\n", "reserved bytes:", aHdr[20]);
for(i=0; i<sizeof(aField)/sizeof(aField[0]); i++){
int ofst = aField[i].ofst;
unsigned int val = get4byteInt(aHdr + ofst);
fprintf(p->out, "%-20s %u", aField[i].zName, val);
switch( ofst ){
case 56: {
if( val==1 ) fprintf(p->out, " (utf8)");
if( val==2 ) fprintf(p->out, " (utf16le)");
if( val==3 ) fprintf(p->out, " (utf16be)");
}
}
fprintf(p->out, "\n");
}
fprintf(p->out, "%-20s %d\n", "number of tables:",
db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='table'"));
fprintf(p->out, "%-20s %d\n", "number of indexes:",
db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='index'"));
fprintf(p->out, "%-20s %d\n", "number of triggers:",
db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='trigger'"));
fprintf(p->out, "%-20s %d\n", "number of views:",
db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='view'"));
fprintf(p->out, "%-20s %d\n", "schema size:",
db_int(p, "SELECT total(length(sql)) FROM sqlite_master"));
return 0;
}
/*
** If an input line begins with "." then invoke this routine to
** process that line.
@@ -2980,6 +3072,10 @@ static int do_meta_command(char *zLine, ShellState *p){
}
}else
if( c=='i' && strncmp(azArg[0], "info", n)==0 ){
rc = shell_info_command(p);
}else
#ifdef SQLITE_ENABLE_IOTRACE
if( c=='i' && strncmp(azArg[0], "iotrace", n)==0 ){
extern void (*sqlite3IoTrace)(const char*, ...);