在 MySQL 复制的环境中,要通过 JDBC 连接这个 MySQL 集群,就必须使用 ReplicationDriver 这个类来替换原有的 com.mysql.jdbc.Driver 。不过该 Driver 在连接池环境下无效,要通过连接池连接 MySQL 集群可使用 lbpool。
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://master,slave1,slave2,slave3/test", props); // // Perform read/write work on the master // by setting the read-only flag to "false" // //这个节点应该是通过spring的事务管理来设置,同时这个conn对象应该不是一个真正的connection, //而是一个代理类,通过设置readonly,代理类会去使用不同的connection, //那么问题是它该代理类使用的connection是哪里取的,抑或说难道它每次都会新开一个connection?,需要看源代码 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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