MySQL 读写分离实例详解

MySQL 读写分离

MySQL读写分离又一好办法 使用 com.mysql.jdbc.ReplicationDriver

在用过Amoeba 和 Cobar，还有dbware 等读写分离组件后，今天我的一个好朋友跟我讲，MySQL自身的也是可以读写分离的，因为他们提供了一个新的驱动，叫 com.mysql.jdbc.ReplicationDriver

说明文档：http://dev.mysql.com/doc/refman/5.1/en/connector-j-reference-replication-connection.html

代码例子：

import java.sql.Connection;
import java.sql.ResultSet;
import java.util.Properties;

import com.mysql.jdbc.ReplicationDriver;

public class ReplicationDriverDemo {

 public static void main(String[] args) throws Exception {
  ReplicationDriver driver = new ReplicationDriver();

  Properties props = new Properties();

  // We want this for failover on the slaves
  props.put("autoReconnect", "true");

  // We want to load balance between the slaves
  props.put("roundRobinLoadBalance", "true");

  props.put("user", "foo");
  props.put("password", "bar");

  //
  // Looks like a normal MySQL JDBC url, with a
  // comma-separated list of hosts, the first
  // being the 'master', the rest being any number
  // of slaves that the driver will load balance against
  //

  Connection conn =
    driver.connect("jdbc:mysql:replication://master,slave1,slave2,slave3/test",
      props);

  //
  // Perform read/write work on the master
  // by setting the read-only flag to "false"
  //

  conn.setReadOnly(false);
  conn.setAutoCommit(false);
  conn.createStatement().executeUpdate("UPDATE some_table ....");
  conn.commit();

  //
  // Now, do a query from a slave, the driver automatically picks one
  // from the list
  //

  conn.setReadOnly(true);

  ResultSet rs =
   conn.createStatement().executeQuery("SELECT a,b FROM alt_table");

   .......
 }
}

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