Question

我试图在Xcode中更新我的sqlite数据库中的一些数据，但是它一直在失败。这是我的代码。

NSString *docsDir;
NSArray *dirPaths;
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
_databasePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent:@"users.db"]];

NSFileManager *filemgr = [NSFileManager defaultManager];

if ([filemgr fileExistsAtPath: _databasePath ] == NO)
{
    NSLog(@"Error: Cant find users db to save data");
}else{
    const char *dbpath = [_databasePath UTF8String];
    sqlite3_stmt    *statement = NULL;

    if (sqlite3_open(dbpath, &_usersDB) == SQLITE_OK)
    {
        NSString *querySQL = [NSString stringWithFormat:@"UPDATE users SET companyname = \'%@\', companyaddress = \'%@\', companycity = \'%@\', companystate = \'%@\', companyzip = \'%@\', companyphone = \'%@\', companyfax = \'%@\', companyemail = \'%@\', companywebsite = \'%@\', driverfirstname = \'%@\', driverlastname = \'%@\', driveraddress = \'%@\', drivercity = \'%@\', driverstate = \'%@\', driverzip = \'%@\', driverphone = \'%@\', driverfax = \'%@\', driveremail = \'%@\', driverwebsite = \'%@\', WHERE user = \'%@\'",
                              self.companyName.text,
                              self.companyAddress.text,
                              self.companyCity.text,
                              self.companyState.text,
                              self.companyZip.text,
                              self.companyPhone.text,
                              self.companyFax.text,
                              self.companyEmail.text,
                              self.companyWebsite.text,
                              self.driverFirstName.text,
                              self.driverLastName.text,
                              self.driverAddress.text,
                              self.driverCity.text,
                              self.driverState.text,
                              self.driverZip.text,
                              self.driverPhone.text,
                              self.driverFax.text,
                              self.driverEmail.text,
                              self.driverWebsite.text,
                              [[PFUser currentUser] objectId]];

        const char *query_stmt = [querySQL UTF8String];
        sqlite3_finalize(statement);
        sqlite3_prepare_v2(_usersDB, query_stmt, -1, &statement, NULL);
        if (sqlite3_step(statement) == SQLITE_DONE)
        {
            NSLog(@"Updated user in db");

        } else {
            NSLog(@"Failed to update user in db");
        }
        sqlite3_finalize(statement);
        sqlite3_close(_usersDB);
    }
}

有人能告诉我哪里出错了。我的代码继续使用＃34;无法在db＆＃34;中更新用户最后的NSLog声明。

提前致谢。

Answer 1

您必须检查sqlite3_prepare_v2的返回值。

如果sqlite3_prepare_v2或sqlite3_step失败，您应致电sqlite3_errmsg以获取有用的错误消息。

（并且该消息会告诉您在剩余逗号后WHERE无效。）

将数据更新到SQLITE数据库

1 个答案: