使用SqlCommand 执行SQL语句

Posted 2020-10-02

string sConnectionString = @"server=(local)\SQLEXPRESS;database=Forum;Trusted_Connection=True";

using (SqlConnection conn = new SqlConnection(sConnectionString))

{

    conn.Open();

    using (SqlCommand cmd = new SqlCommand())

    {

        // 绑定有效的数据库连接

        cmd.Connection = conn;

        // 定义操作1的SQL语句

        cmd.CommandText = "Insert into tbClass (ClassName) values (‘网页设计‘)";

        // 完成操作1并输出相应的记录数

        Response.Write(string.Format("在tbClass中插入了{0}条记录<br>", cmd.ExecuteNonQuery()));

        // 定义操作2的SQL语句

        cmd.CommandText = "Select ClassID from tbClass where ClassName=‘网页设计‘";

        // 完成操作2

        string sClassID = cmd.ExecuteScalar().ToString();

        // 输出操作2的结果

        Response.Write(string.Format("ClassID为{0}<br>", sClassID));

        // 定义操作3的SQL语句

        cmd.CommandText = string.Format("Insert into tbBoard (BoardName,BoardClassID) values (‘PHOTOSHOP‘,‘{0}‘);Insert into tbBoard (BoardName,BoardClassID) values (‘FIREWORKS‘,‘{0}‘)", sClassID);

        // 完成操作3并输出相应的记录数

        Response.Write(string.Format("在tbBoard中插入了{0}条记录<br>", cmd.ExecuteNonQuery()));

        // 定义操作4的SQL语句

        cmd.CommandText = "Update tbBoard set BoardName=‘PS技术‘ where BoardName=‘PHOTOSHOP‘";

        // 完成操作4并输出相应的记录数

        Response.Write(string.Format("在tbBoard中修改了{0}条记录<br>", cmd.ExecuteNonQuery()));

        // 定义操作5的SQL语句

        cmd.CommandText = string.Format("Delete from tbBoard where BoardClassID=‘{0}‘", sClassID);

        // 完成操作5并输出相应的记录数

        Response.Write(string.Format("在tbBoard中删除了{0}条记录<br>", cmd.ExecuteNonQuery()));

        // 定义操作6的SQL语句

        cmd.CommandText = string.Format("Delete from tbClass where ClassID=‘{0}‘", sClassID);

        // 完成操作6并输出相应的记录数

        Response.Write(string.Format("在tbClass中删除了{0}条记录<br>", cmd.ExecuteNonQuery()));

    }

}