ios – 如何调用sqlite3_errmsg来了解sqlite3_prepare_v2失败的

虽然here问了同样的问题,但遗憾的是仍然没有答案.

我想知道错误和纠正将非常感激.谢谢.

- (NSArray *)failedBankInfos {
    NSMutableArray *retval = [[NSMutableArray alloc]init];
    NSString *query = @"SELECT id,name,city,state FROM failed_banks ORDER BY close_date DESC";
    sqlite3_stmt *statement;
    int tmp  = sqlite3_prepare_v2(_database,[query UTF8String],-1,&statement,nil);
    NSLog(@"%i",tmp); // printing 1
    if (sqlite3_prepare_v2(_database,nil)
        == SQLITE_OK) {
        while (sqlite3_step(statement) == SQLITE_ROW) {
            int uniqueId = sqlite3_column_int(statement,0);
            char *nameChars = (char *) sqlite3_column_text(statement,1);
            char *cityChars = (char *) sqlite3_column_text(statement,2);
            char *stateChars = (char *) sqlite3_column_text(statement,3);

            NSString *name = [[NSString alloc] initWithUTF8String:nameChars];
            NSString *city = [[NSString alloc] initWithUTF8String:cityChars];
            NSString *state = [[NSString alloc] initWithUTF8String:stateChars];
            NSLog(@"name is  : %@",name);
             NSLog(@"city is : %@",city);
            FailedBankInfo *info = [[FailedBankInfo alloc]
                                    initWithUniqueId:uniqueId name:name city:city state:state];
            [retval addObject:info];
        }
        sqlite3_finalize(statement);
    }
    else
    {
        // if part is failing and control is arriving in else.
    }
    return retval;

}