asp.net c# mysql存储过程-优快云博客

本文演示了如何使用C#和MySql.Data库创建MySQL数据库连接，并通过存储过程实现员工信息的添加。首先创建了一个名为emp的表，然后定义了一个名为add_emp的存储过程用于插入员工数据。示例代码展示了如何调用该存储过程并获取自动生成的ID。

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//asp.net C#

//myql5.0以上

using System.Data; //CommandType , ParameterDirection

using System.Diagnostics; //Debug , visual web developer中调试窗口中输出

public void test()
{
MySqlConnection conn = new MySqlConnection();
conn.ConnectionString = "server=localhost;user=root;database=test;port=3306;password=123456;";
MySqlCommand cmd = new MySqlCommand();

try
{
Debug.WriteLine("Connecting to MySQL...");
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "DROP PROCEDURE IF EXISTS add_emp";
cmd.ExecuteNonQuery();
cmd.CommandText = "DROP TABLE IF EXISTS emp";
cmd.ExecuteNonQuery();
cmd.CommandText = "CREATE TABLE emp (empno INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, first_name VARCHAR(20), last_name VARCHAR(20), birthdate DATE)";
cmd.ExecuteNonQuery();

cmd.CommandText = "CREATE PROCEDURE add_emp(" +
"IN fname VARCHAR(20), IN lname VARCHAR(20), IN bday DATETIME, OUT empno INT)" +
"BEGIN INSERT INTO emp(first_name, last_name, birthdate) " +
"VALUES(fname, lname, DATE(bday)); SET empno = LAST_INSERT_ID(); END";

cmd.ExecuteNonQuery();
}
catch (MySqlException ex)
{
Console.WriteLine ("Error " + ex.Number + " has occurred: " + ex.Message);
}
conn.Close();
Console.WriteLine("Connection closed.");
try
{
Debug.WriteLine("Connecting to MySQL...");

conn.Open();
cmd.Connection = conn;

cmd.CommandText = "add_emp";
cmd.CommandType = CommandType.StoredProcedure;

cmd.Parameters.AddWithValue("@lname", "Jones");
cmd.Parameters["@lname"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("@fname", "Tom");
cmd.Parameters["@fname"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("@bday", "1940-06-07");
cmd.Parameters["@bday"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("@empno", MySqlDbType.Int32);
cmd.Parameters["@empno"].Direction = ParameterDirection.Output;

cmd.ExecuteNonQuery();

Debug.WriteLine("Employee number: " + cmd.Parameters["@empno"].Value);
Debug.WriteLine("Birthday: " + cmd.Parameters["@bday"].Value);
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
Debug.WriteLine("Error " + ex.Number + " has occurred: " + ex.Message);
}
conn.Close();
Debug.WriteLine("Done.");

}

//上面代码来自 Mysql.Data.chm

程序输出：

Employee number: 1
Birthday: 1940-06-07