mydatabase.cs

csharp课本的源代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace TestComponent
{
    public class MyDataBase
    {
        //返回表中记录数
        public int GetRecordCount(string connString, string tableName)
        {
            int number = -1;
            SqlConnection conn = new SqlConnection(connString);
            SqlCommand command = new SqlCommand("select count(*) from " + tableName, conn);
            try
            {
                conn.Open();
                number = (int)command.ExecuteScalar();
                conn.Close();
            }
            catch (Exception err)
            {
                throw new Exception(err.Message);
            }
            return number;
        }
        //根据Select语句自动生成其他SQL语句
        public void BuildAdapter(ref SqlDataAdapter adapter)
        {
            SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
            adapter.DeleteCommand = builder.GetDeleteCommand();
            adapter.InsertCommand = builder.GetInsertCommand();
            adapter.UpdateCommand = builder.GetUpdateCommand();
        }
    }
}