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基于C#编程语言的Mysql常用操作

2024-09-30 11:22:02   218人阅读

一、开始需要先将C#中与mysql相关的引用添加进来

using MySql.Data.MySqlClient;

二、连接mysql，创建一个连接对象，接着开其启对象

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");//创建mysql的连接对象
m_conn.Open();//开启连接

三、查询

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
DataTable dt = new DataTable("ds"); 
DataSet ds = new DataSet(); //创建一个数据集来存放查询的返回结果
MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM TEST.PERSON", m_conn); //创建一个数据适配器来查找数据
da.SelectCommand.CommandTimeout = 12000;
da.Fill(ds, "ds"); //将查询到的数据填充到数据集dataset中，
dt=ds.Tables[0];

四、插入

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
MySqlCommand cmd = new MySqlCommand("INSERT INTO test.person(personcode,personname1) values(‘123456‘,‘测试老王‘)", m_conn);
cmd.CommandTimeout = 12000;
int iRecordAffected = cmd.ExecuteNonQuery();//返回插入了几条数据

五、更新

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
MySqlCommand cmd = new MySqlCommand("update test.person set personname1=‘测试王二麻子‘ where personcode=‘123456‘", m_conn);
cmd.CommandTimeout = 12000;
int iRecordAffected = cmd.ExecuteNonQuery();//返回更新了几条数据

六、删除

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
MySqlCommand cmd = new MySqlCommand("delete from test.person where personname1=‘测试王二麻子‘ and personcode=‘123456‘", m_conn);
cmd.CommandTimeout = 12000;
int iRecordAffected = cmd.ExecuteNonQuery();//返回删除了几条数据

七、事务查询

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
MySqlTransaction m_trans = m_conn.BeginTransaction();
DataTable dt = new DataTable("ds");
DataSet ds = new DataSet();
if (m_trans != null)
{
  MySqlDataAdapter mda = new MySqlDataAdapter("SELECT personname1 FROM person", m_conn);
  mda.SelectCommand.CommandTimeout = 12000;
  mda.Fill(ds, "ds");
  if (ds.Tables.Count > 0)
  {
      dt = ds.Tables[0];
  }
  m_trans.Commit();       //事务结束的标志就是调用事务的提交方法commit()
}

八、事务插入，事务更新，事务删除除了SQL语句不同其余都一样

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
MySqlCommand cmd = new MySqlCommand("INSERT INTO person(personcode,personname1) values(‘123456‘,‘测试老王‘)", m_conn);
MySqlTransaction m_trans = m_conn.BeginTransaction();
cmd.Transaction = m_trans;
cmd.CommandTimeout = 12000;
if (m_trans != null)
{
    int iRecordAffected = cmd.ExecuteNonQuery();
　　 m_trans.Commit();       //事务结束的标志就是调用事务的提交方法commit()
}

九、事务回滚

MySqlConnection m_conn = new MySqlConnection("server=localhost;user id=root;password=root;persist security info=True;database=test");
m_conn.Open();
MySqlCommand cmd = new MySqlCommand("INSERT INTO person(personcode,personname1) values(‘123456‘,‘测试老王‘)", m_conn);
MySqlTransaction m_trans = m_conn.BeginTransaction();
cmd.Transaction = m_trans;
cmd.CommandTimeout = 12000;
if (m_trans != null)
{
    int iRecordAffected = cmd.ExecuteNonQuery();
    m_trans.Rollback();      //在事务提交之前调用事务的回滚方法，可以返回到事务开始前的数据库状态，相当于此次事务内对数据库的操作无效。
}

 

基于C#编程语言的Mysql常用操作


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