ios - Combine two sqlite3 queries -


can combine these 2 queries how?

i'm getting error of table not found in second query, , think of sqlite calls in first query.

nsstring *dayname = del.dayname; int rowcount = del.tablerownumber;  nsstring *sqlitedb = [[nsbundle mainbundle] pathforresource:@"banklist" oftype:@"sqlite3"];  if(sqlite3_open([sqlitedb utf8string], &_database) == sqlite_ok) {     nsstring *sqlstatement = [nsstring stringwithformat:@"update %@ set recipe_name='%@' cell_id='%i'",dayname, info.name, rowcount];     sqlite3_stmt *compiledstatement;      if(sqlite3_prepare_v2(_database, [sqlstatement utf8string] , -1, &compiledstatement, null) == sqlite_ok)     {         sqlite3_bind_text( compiledstatement, 1, [sqlitedb utf8string], -1, sqlite_transient);     }     if(sqlite3_step(compiledstatement) != sqlite_done )     {         nslog( @"save error: %s", sqlite3_errmsg(_database) );     }     else     {         sqlite3_reset(compiledstatement);     }      sqlite3_finalize(compiledstatement);       nsstring *sqlstatement2 = [nsstring stringwithformat:@"update %@ set recipe_id = (select key recipes name = monday.recipe_name)",dayname];     sqlite3_stmt *compiledstatement2;      if(sqlite3_prepare_v2(_database, [sqlstatement2 utf8string] , -1, &compiledstatement2, null) == sqlite_ok)     {         sqlite3_bind_text( compiledstatement2, 1, [sqlitedb utf8string], -1, sqlite_transient);     }     if(sqlite3_step(compiledstatement2) != sqlite_done )     {         nslog( @"save error: %s", sqlite3_errmsg(_database) );     }     else     {         sqlite3_reset(compiledstatement2);     }      sqlite3_finalize(compiledstatement2); }  sqlite3_close(_database);

thanks

a couple of observations:

  1. you might not want supply parameters query using stringwithformat. if recipe "pat's infamous cookies"? apostrophe interpreted terminating string , prepare function fail. should use ? placeholders in sql , bind values. see section 3 of sqlite documentation.

  2. while i'm suggesting use sqlite3_bind_text function above, calling sqlite3_bind_text , passing path database file. that

    • doesn't make sense given sql, because don't have ? placeholders bind value to; and

    • i'm not sure why you'd passing path of database @ all.

    that call doesn't seem possibly work. if check return code of existing sqlite_bind_text call, i'd wager not sqlite_ok.

  3. if sqlite3_prepare_v2 calls fail (and common point of failure while you're refining sql), you're not logging sqlite3_errmsg. sqlite3_errmsg after sqlite3_prepare_v2 failure 1 of useful error messages (it tell precisely wrong sql). make sure examine sqlite3_errmsg if sqlite3_prepare_v2 not return sqlite_ok.

thus might yield:

if(sqlite3_open([sqlitedb utf8string], &_database) == sqlite_ok) {     nsstring *sqlstatement = [nsstring stringwithformat:@"update %@ set recipe_name=? cell_id=?",dayname];     sqlite3_stmt *compiledstatement;      if(sqlite3_prepare_v2(_database, [sqlstatement utf8string] , -1, &compiledstatement, null) != sqlite_ok)     {         nslog(@"%s: prepare failed: %s", __function__, sqlite3_errmsg(_database));         sqlite3_close(_database);         return;     }      if (sqlite3_bind_text( compiledstatement, 1, [info.name utf8string], -1, sqlite_transient) != sqlite_ok)     {         nslog(@"%s: bind_text failed: %s", __function__, sqlite3_errmsg(_database));         sqlite3_finalize(compiledstatement);         sqlite3_close(_database);         return;     }      if (sqlite3_bind_int( compiledstatement, 2, rowcount) != sqlite_ok)     {         nslog(@"%s: bind_int failed: %s", __function__, sqlite3_errmsg(_database));         sqlite3_finalize(compiledstatement);         sqlite3_close(_database);         return;     }      if (sqlite3_step(compiledstatement) != sqlite_done )     {         nslog(@"save error: %s", sqlite3_errmsg(_database) );         sqlite3_finalize(compiledstatement);         sqlite3_close(_database);         return;     }      // don't need unless you're going reuse prepared statement, aren't     //     //else     //{     //    sqlite3_reset(compiledstatement);     //}      sqlite3_finalize(compiledstatement);      // did mean hardcode "monday" in sql?      nsstring *sqlstatement2 = [nsstring stringwithformat:@"update %@ set recipe_id = (select key recipes name = monday.recipe_name)",dayname];     sqlite3_stmt *compiledstatement2;      if(sqlite3_prepare_v2(_database, [sqlstatement2 utf8string] , -1, &compiledstatement2, null) != sqlite_ok)     {         nslog(@"%s: prepare 2 failed: %s", __function__, sqlite3_errmsg(_database));         sqlite3_close(_database);         return;     }     if(sqlite3_step(compiledstatement2) != sqlite_done )     {         nslog( @"save 2 error: %s", sqlite3_errmsg(_database) );     }      // again, not needed     //     //else     //{     //    sqlite3_reset(compiledstatement);     //}      sqlite3_finalize(compiledstatement2); }  sqlite3_close(_database);

i must confess i'm not crazy data model you're building sql, dynamically supplying table names. i'd rather see single table of days, , make dayname column in table. have should work, it's unusual construct.


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