mysql - 使用 VS 2008 VB 检测 MySQL 字段中的 zerofill

Question

使用 .NET 连接器:http://dev.mysql.com/doc/refman/5.1/en/connector-net-ref.html

在MySQL中设置一个字段为:

decimal(6) zerofill not null

如何在 VB 中检测到“zerofill”标志？

Answer 1

您可以使用SHOW COLUMNS IN tablename 获取列信息，此查询返回以下形式的内容:

field         type                          null   key   default    extra
fieldname     int(10) unsigned zerofill      no            0    

因此，如果 int 中返回的字符串包含 'zerofill' 字符串，那么要获得标志 zerofill，您必须查看类型:

像这样的东西就可以了:

static void Main(string[] args)
{
    dim conn as MySqlConnection
    conn = new MySqlConnection
    conn.ConnectionString = "Server = yourserver; Database = yourdb; Uid = youruser;Pwd = yourpassword;"

    conn.Open

    MySqlCommand cmd = new MySqlCommand
    cmd.Connection = conn
    cmd.CommandText = "SHOW COLUMNS IN yourtable"
    cmd.CommandType = CommandType.Text

    dim reader as MySqlDataReader
    reader = cmd.ExecuteReader

    while reader.Read
        Console.WriteLine("Field:{0}, zerofill:{1}",reader("field"),if(reader("type").ToString().Contains("zerofill"),true,false))
    end while
    conn.Close()
}