Question

我的应用中有两个数据库（customerDB＆amp; s-customerDB）。我想将customerDB信息传输到s-customerDB。我使用以下步骤， 1.打开s-customerDB。 2. Attach和insert语句返回成功resultCode。

但是“select”查询返回0对象。

请指导我做错了什么。

NSString *tempString = [[NSString alloc]initWithString:@" attach DATABASE 'customerDB.db' as customer "];
int resultCode = sqlite3_exec(_database, [tempString UTF8String], NULL, NULL, NULL);
[tempString release]; tempString = nil;

if (resultCode == SQLITE_OK) //Working
{
    NSString *table = [[NSString alloc]initWithString:@"Employee"];
    tempString = [[NSString alloc]initWithString:@"INSERT INTO"];
    tempString = [tempString stringByAppendingFormat:@" %@ select * from customer.%@ ",table,table];
    sqlite3_stmt *stmt_version = 0x00;
    resultCode = sqlite3_prepare_v2(_database, [tempString UTF8String], -1, &stmt_version, NULL);
    [tempString release]; tempString = nil;
    sqlite3_finalize(stmt_version);

    NSArray *tempArraty = [self executeSelectSqlQuery:@"select * from Employee" error:nil];
    if (resultCode == SQLITE_OK) //Working
    {
        return YES;
    }

Answer 1

我在代码中发现了问题。我必须使用sqlite3_exec而不是sqlite3_prepare_v2来执行插入查询。

IOS - 附加数据库 - 插入数据 - 选择数据检索零对象

1 个答案: