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最新评论
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Donald_Draper:
Donald_Draper 写道刘落落cici 写道能给我发一 ...
DatagramChannelImpl 解析三(多播) -
Donald_Draper:
刘落落cici 写道能给我发一份这个类的源码吗Datagram ...
DatagramChannelImpl 解析三(多播) -
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请问楼主,执行消息发送的时候,报错:Transport sch ...
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Memcached分布式客户端(Xmemcached)
JDBC驱动初始化-Mysql:http://donald-draper.iteye.com/blog/2342010
JDBC连接的获取:http://donald-draper.iteye.com/blog/2342011
Mysql负载均衡连接的获取:http://donald-draper.iteye.com/blog/2342089
Mysql主从复制读写分离连接的获取:http://donald-draper.iteye.com/blog/2342108
ConnectionImp创建MysqlIO :http://donald-draper.iteye.com/blog/2342959
Mysql预编译SQL:http://donald-draper.iteye.com/blog/2342960
MysqlSQL PreparedStatement的查询:http://donald-draper.iteye.com/blog/2343083
MySQL ServerPreparedStatement查询:http://donald-draper.iteye.com/blog/2343124
前面讲过Driver的初始化,单机Server连接的获取,负载均衡连接的获取,今天讲一下主从复制,读写分析连接的获取:
从下面一段代码来看:
//如果url以jdbc:mysql:replication://则调用集群连接获取方法
//NonRegisteringDriver
我们来看一下ReplicationConnection
总结:
从上面可以看出,主从集群的连接获取,首先解析url分离出Mater host和Slave host,第一个为Master,后面为Slave,NonRegisteringDriver创建复制连接时,返回的是一个ReplicationConnection,而ReplicationConnection内有三个连接分别为,currentConnection,masterConnection,slavesConnection,
这三个连接实际上是ConnectionImpl;默认情况下currentConnection为masterConnection,当我们设置readonly为true时,切换到slavesConnection,为false,切换到masterConnection;;ReplicationConnection的相关方法的实现,实际上是调用ConnectionImpl的相应方法。
//NonRegisteringReplicationDriver
JDBC连接的获取:http://donald-draper.iteye.com/blog/2342011
Mysql负载均衡连接的获取:http://donald-draper.iteye.com/blog/2342089
Mysql主从复制读写分离连接的获取:http://donald-draper.iteye.com/blog/2342108
ConnectionImp创建MysqlIO :http://donald-draper.iteye.com/blog/2342959
Mysql预编译SQL:http://donald-draper.iteye.com/blog/2342960
MysqlSQL PreparedStatement的查询:http://donald-draper.iteye.com/blog/2343083
MySQL ServerPreparedStatement查询:http://donald-draper.iteye.com/blog/2343124
前面讲过Driver的初始化,单机Server连接的获取,负载均衡连接的获取,今天讲一下主从复制,读写分析连接的获取:
从下面一段代码来看:
//如果url以jdbc:mysql:replication://则调用集群连接获取方法
if(StringUtils.startsWithIgnoreCase(url, "jdbc:mysql:replication://")) return connectReplicationConnection(url, info);
//NonRegisteringDriver
private Connection connectReplicationConnection(String url, Properties info) throws SQLException { Properties parsedProps = parseURL(url, info); if(parsedProps == null) return null; Properties masterProps = (Properties)parsedProps.clone(); Properties slavesProps = (Properties)parsedProps.clone(); slavesProps.setProperty("com.mysql.jdbc.ReplicationConnection.isSlave", "true"); String hostValues = parsedProps.getProperty("HOST"); if(hostValues != null) { StringTokenizer st = new StringTokenizer(hostValues, ","); StringBuffer masterHost = new StringBuffer(); StringBuffer slaveHosts = new StringBuffer(); //Url中第一个host为master,后面为Slave if(st.hasMoreTokens()) { String hostPortPair[] = parseHostPortPair(st.nextToken()); if(hostPortPair[0] != null) masterHost.append(hostPortPair[0]); if(hostPortPair[1] != null) { masterHost.append(":"); masterHost.append(hostPortPair[1]); } } boolean firstSlaveHost = true; do { if(!st.hasMoreTokens()) break; String hostPortPair[] = parseHostPortPair(st.nextToken()); if(!firstSlaveHost) slaveHosts.append(","); else firstSlaveHost = false; if(hostPortPair[0] != null) slaveHosts.append(hostPortPair[0]); if(hostPortPair[1] != null) { slaveHosts.append(":"); slaveHosts.append(hostPortPair[1]); } } while(true); if(slaveHosts.length() == 0) throw SQLError.createSQLException("Must specify at least one slave host to connect to for master/slave replication load-balancing functionality", "01S00", null); //MaterHost masterProps.setProperty("HOST", masterHost.toString()); //SlaveHost slavesProps.setProperty("HOST", slaveHosts.toString()); } return new ReplicationConnection(masterProps, slavesProps); }
我们来看一下ReplicationConnection
public class ReplicationConnection implements Connection, PingTarget { protected Connection currentConnection;//当前连接 protected Connection masterConnection;//主连接 protected Connection slavesConnection;//从连接 public ReplicationConnection(Properties masterProperties, Properties slaveProperties) throws SQLException { NonRegisteringDriver driver = new NonRegisteringDriver(); StringBuffer masterUrl = new StringBuffer("jdbc:mysql://"); StringBuffer slaveUrl = new StringBuffer("jdbc:mysql://"); String masterHost = masterProperties.getProperty("HOST"); //初始化Master与Slave的URL if(masterHost != null) masterUrl.append(masterHost); String slaveHost = slaveProperties.getProperty("HOST"); if(slaveHost != null) slaveUrl.append(slaveHost); String masterDb = masterProperties.getProperty("DBNAME"); masterUrl.append("/"); if(masterDb != null) masterUrl.append(masterDb); String slaveDb = slaveProperties.getProperty("DBNAME"); slaveUrl.append("/"); if(slaveDb != null) slaveUrl.append(slaveDb); slaveProperties.setProperty("roundRobinLoadBalance", "true"); //从Driver获取Master连接 masterConnection = (Connection)driver.connect(masterUrl.toString(), masterProperties); //从Driver获取Slave连接 slavesConnection = (Connection)driver.connect(slaveUrl.toString(), slaveProperties); slavesConnection.setReadOnly(true); //当前连接为masterConnection currentConnection = masterConnection; } public synchronized void setReadOnly(boolean readOnly) throws SQLException { if(readOnly) { if(currentConnection != slavesConnection) switchToSlavesConnection(); } else if(currentConnection != masterConnection) switchToMasterConnection(); } //Master与SLave连接切换 private synchronized void switchToMasterConnection() throws SQLException { swapConnections(masterConnection, slavesConnection); } //Slave与Master连接切换 private synchronized void switchToSlavesConnection() throws SQLException { swapConnections(slavesConnection, masterConnection); } //切换连接 private synchronized void swapConnections(Connection switchToConnection, Connection switchFromConnection) throws SQLException { String switchFromCatalog = switchFromConnection.getCatalog(); String switchToCatalog = switchToConnection.getCatalog(); if(switchToCatalog != null && !switchToCatalog.equals(switchFromCatalog)) switchToConnection.setCatalog(switchFromCatalog); else if(switchFromCatalog != null) switchToConnection.setCatalog(switchFromCatalog); boolean switchToAutoCommit = switchToConnection.getAutoCommit(); boolean switchFromConnectionAutoCommit = switchFromConnection.getAutoCommit(); if(switchFromConnectionAutoCommit != switchToAutoCommit) switchToConnection.setAutoCommit(switchFromConnectionAutoCommit); int switchToIsolation = switchToConnection.getTransactionIsolation(); int switchFromIsolation = switchFromConnection.getTransactionIsolation(); if(switchFromIsolation != switchToIsolation) switchToConnection.setTransactionIsolation(switchFromIsolation); currentConnection = switchToConnection; } //回滚 public synchronized void rollback() throws SQLException { currentConnection.rollback(); } public synchronized void rollback(Savepoint savepoint) throws SQLException { currentConnection.rollback(savepoint); } //设置是否自动提交 public synchronized void setAutoCommit(boolean autoCommit) throws SQLException { currentConnection.setAutoCommit(autoCommit); } public PreparedStatement prepareStatement(String sql) throws SQLException { PreparedStatement pstmt = currentConnection.prepareStatement(sql); ((com.mysql.jdbc.Statement)pstmt).setPingTarget(this); return pstmt; } public CallableStatement prepareCall(String sql) throws SQLException { return currentConnection.prepareCall(sql); } }
总结:
从上面可以看出,主从集群的连接获取,首先解析url分离出Mater host和Slave host,第一个为Master,后面为Slave,NonRegisteringDriver创建复制连接时,返回的是一个ReplicationConnection,而ReplicationConnection内有三个连接分别为,currentConnection,masterConnection,slavesConnection,
这三个连接实际上是ConnectionImpl;默认情况下currentConnection为masterConnection,当我们设置readonly为true时,切换到slavesConnection,为false,切换到masterConnection;;ReplicationConnection的相关方法的实现,实际上是调用ConnectionImpl的相应方法。
//NonRegisteringReplicationDriver
public class NonRegisteringReplicationDriver extends NonRegisteringDriver { public NonRegisteringReplicationDriver() throws SQLException { } public Connection connect(String url, Properties info) throws SQLException { Properties parsedProps = parseURL(url, info); if(parsedProps == null) return null; Properties masterProps = (Properties)parsedProps.clone(); Properties slavesProps = (Properties)parsedProps.clone(); slavesProps.setProperty("com.mysql.jdbc.ReplicationConnection.isSlave", "true"); String hostValues = parsedProps.getProperty("HOST"); if(hostValues != null) { StringTokenizer st = new StringTokenizer(hostValues, ","); StringBuffer masterHost = new StringBuffer(); StringBuffer slaveHosts = new StringBuffer(); if(st.hasMoreTokens()) { String hostPortPair[] = parseHostPortPair(st.nextToken()); if(hostPortPair[0] != null) masterHost.append(hostPortPair[0]); if(hostPortPair[1] != null) { masterHost.append(":"); masterHost.append(hostPortPair[1]); } } boolean firstSlaveHost = true; do { if(!st.hasMoreTokens()) break; String hostPortPair[] = parseHostPortPair(st.nextToken()); if(!firstSlaveHost) slaveHosts.append(","); else firstSlaveHost = false; if(hostPortPair[0] != null) slaveHosts.append(hostPortPair[0]); if(hostPortPair[1] != null) { slaveHosts.append(":"); slaveHosts.append(hostPortPair[1]); } } while(true); if(slaveHosts.length() == 0) throw SQLError.createSQLException("Must specify at least one slave host to connect to for master/slave replication load-balancing functionality", "01S00", null); masterProps.setProperty("HOST", masterHost.toString()); slavesProps.setProperty("HOST", slaveHosts.toString()); } return new ReplicationConnection(masterProps, slavesProps); } }
发表评论
-
Mysql PreparedStatement 批处理
2016-12-06 18:09 1384JDBC驱动初始化-Mysql:http://donald-d ... -
MySQL ServerPreparedStatement查询
2016-12-06 14:42 1291JDBC驱动初始化-Mysql:http://donald-d ... -
MysqlSQL PreparedStatement的查询
2016-12-06 11:40 2028JDBC驱动初始化-Mysql:http://donald-d ... -
Mysql预编译SQL
2016-12-05 19:06 1159JDBC驱动初始化-Mysql:http://donald-d ... -
ConnectionImp创建MysqlIO
2016-12-05 19:01 1019JDBC驱动初始化-Mysql:http://donald-d ... -
Mysql负载均衡连接的获取
2016-12-01 08:38 1323Java动态代理:http://www.cnblogs.com ... -
JDBC连接的获取
2016-11-30 12:44 2932JDBC驱动初始化-Mysql:http://donald-d ... -
JDBC驱动初始化-Mysql
2016-11-30 12:41 3049JDBC驱动初始化-Mysql:http://donald-d ... -
mysql 存储过程
2016-07-17 14:49 898存储过程基础:http://sishuok.com/forum ... -
java.sql.Date,java.util.Date,java.sql.Timestamp的区别
2016-07-17 11:50 878java.sql.Date,jdbc映射数据库中的date类型 ... -
JDBC PreparedStatement 的用法
2016-07-15 17:27 892import java.sql.Connection; im ...
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