前言
该项目属于我抱着学习的心态去做的项目，并没有受到专业的测试，不值得在生产中使用，仅仅供读者参考。如果想要用类似的功能，建议还是使用当当网的sharding-jdbc，赋上该官网https://shardingsphere.apache.org/document/current/cn/overview/。
简介
这是负载均衡的跨驱动的解耦的连接池，它提供：
- 多个数据库查询操作的负载均衡
- 保证多个同类的数据库的更新操作的事务
- 跨数据库驱动,以及不同业务的数据库
- 高解耦，用户只需配置一下数据源，其他数据库的操作都无需再与本框架耦合。
- 自动检查失效的数据库连接池，并恢复该连接池的正常运行
- 可在Spring中直接通过注入的方式即可使用DataSource，或者将DataSource配置在JPA、Hibernate或MyBatis中使用。
具体流程
BinMuiltDataSource具体执行流程.png
实例
package bin.framework.test;
import bin.framework.BinMultiDataSource;
import bin.framework.DataSourceCilentNode;
import org.junit.Before;
import org.junit.Test;
import java.sql.*;
import java.util.Arrays;
public class JdbcSingleDataSourceTest {
BinMultiDataSource binMultiDataSource;
@Before
public void init(){
DataSourceCilentNode binTestDataSourceCilentNode =new DataSourceCilentNode();
//groupId就是指负载均衡组ID,同一个groupId的DataSourceCilentNode应该其对应的数据库，表结构，表数据都相同，以防止负载均衡操作时导致
//的因不一致而抛出异常
binTestDataSourceCilentNode.setGroupId("1");
binTestDataSourceCilentNode.setDriver("com.mysql.cj.jdbc.Driver");
binTestDataSourceCilentNode.setUsername("root");
binTestDataSourceCilentNode.setPassword("root");
binTestDataSourceCilentNode.setUrl("jdbc:mysql://127.0.0.1:3306/bin_test?serverTimezone=UTC&characterEncoding=utf8");
DataSourceCilentNode binTest2DataSourceCilentNode =new DataSourceCilentNode();
binTest2DataSourceCilentNode.setGroupId("1");
binTest2DataSourceCilentNode.setDriver("com.mysql.cj.jdbc.Driver");
binTest2DataSourceCilentNode.setUsername("root");
binTest2DataSourceCilentNode.setPassword("root");
binTest2DataSourceCilentNode.setUrl("jdbc:mysql://127.0.0.1:3306/bin_test2?serverTimezone=UTC&characterEncoding=utf8");
binMultiDataSource=new BinMultiDataSource(Arrays.asList(binTestDataSourceCilentNode, binTest2DataSourceCilentNode));
DataSourceCilentNode ydddDataSourceCilentNode =new DataSourceCilentNode();
ydddDataSourceCilentNode.setGroupId("2");
ydddDataSourceCilentNode.setDriver("oracle.jdbc.driver.OracleDriver");
ydddDataSourceCilentNode.setUsername("yddd");
ydddDataSourceCilentNode.setPassword("yddd123");
ydddDataSourceCilentNode.setUrl("jdbc:oracle:thin:@192.168.191.2:1621/orcl");
binMultiDataSource=new BinMultiDataSource(Arrays.asList(binTestDataSourceCilentNode, ydddDataSourceCilentNode));
}
@Test
public void test_noSpecifyGroupIdSQL() throws SQLException {
Connection connection = binMultiDataSource.getConnection();
PreparedStatement preparedStatement = connection.prepareStatement("select * from dept");
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()){
String id = resultSet.getString("id");
String name=resultSet.getString("name");
System.out.println(String.format("id=%s,name=%s",id,name));
}
Connection ydddConnection=binMultiDataSource.getConnection();
PreparedStatement ydddPreparedStatement = ydddConnection.prepareStatement("select * from t_b_user_foura");
ResultSet ydddResultSet = ydddPreparedStatement.executeQuery();
while (ydddResultSet.next()){
String id = ydddResultSet.getString("ID");
String userId=ydddResultSet.getString("USER_ID");
String fouraUsername=ydddResultSet.getString("FOURA_USERNAME");
System.out.println(String.format("id=%s,userId=%s,fouraUsername=%s",id,userId,fouraUsername));
}
}
@Test
public void test_specifyGroupIdSQL() throws SQLException {
Connection connection = binMultiDataSource.getConnection();
PreparedStatement preparedStatement = connection.prepareStatement("select * from [1]dept");
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()){
String id = resultSet.getString("id");
String name=resultSet.getString("name");
System.out.println(String.format("id=%s,name=%s",id,name));
}
}
@Test
public void test_joinSQL() throws SQLException {
Connection connection = binMultiDataSource.getConnection();
PreparedStatement preparedStatement = connection.prepareStatement(
"select u.id user_id,u.name user_name,d.id dept_id,d.name dept_name" +
" from user u left join dept d on d.id=u.dept_id where u.id=?");
preparedStatement.setString(1,"1");
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()){
String userId = resultSet.getString("user_id");
String userName=resultSet.getString("user_name");
String deptId=resultSet.getString("dept_id");
String deptName=resultSet.getString("dept_name");
System.out.println(String.format("userId=%s,userName=%s,deptId=%s,deptName=%s",userId,userName,deptId,deptName));
}
}
@Test
public void test_insertSQL() throws SQLException {
Connection connection=binMultiDataSource.getConnection();
connection.setAutoCommit(false);
PreparedStatement preparedStatement = connection.prepareStatement("INSERT INTO USER (ID,NAME,AGE,DES_NAME,DEPT_ID) VALUE (?,?,?,?,?)");
preparedStatement.setString(1,"15");
preparedStatement.setString(2,"五六七2");
preparedStatement.setString(3,"25");
preparedStatement.setString(4,"刺客");
preparedStatement.setString(5,"2");
int i = preparedStatement.executeUpdate();
connection.rollback();
System.out.println("test_insert : "+i);
}
@Test
public void test_updateSQL() throws SQLException{
Connection connection=binMultiDataSource.getConnection();
connection.setAutoCommit(false);
PreparedStatement preparedStatement = connection.prepareStatement("UPDATE USER SET NAME=?,AGE=?,DES_NAME=?,DEPT_ID=? WHERE ID=?");
preparedStatement.setString(1,"五六七-up");
preparedStatement.setString(2,"25");
preparedStatement.setString(3,"刺客");
preparedStatement.setString(4,"2");
preparedStatement.setString(5,"5");
int i = preparedStatement.executeUpdate();
connection.commit();
System.out.println("test_insert : "+i);
}
@Test
public void test_deleteSQL() throws SQLException {
Connection connection=binMultiDataSource.getConnection();
connection.setAutoCommit(false);
PreparedStatement preparedStatement = connection.prepareStatement("DELETE FROM USER WHERE ID= ?");
preparedStatement.setString(1,"15");
int i = preparedStatement.executeUpdate();
connection.commit();
System.out.println(("test_deleteSQL : "+i));
}
@Test
public void test_procedureSpecifyGroupId() throws SQLException {
Connection connection = binMultiDataSource.getConnection();
CallableStatement callableStatement = connection.prepareCall("call [1]delete_matches(?)");
callableStatement.setString(1,"5");
int i = callableStatement.executeUpdate();
System.out.println("test_procedureSpecifyGroupId : "+i);
}
@Test
public void test_procedure() throws SQLException {
Connection connection = binMultiDataSource.getConnection();
CallableStatement callableStatement = connection.prepareCall("call delete_matches(?)");
callableStatement.setString(1,"5");
int i = callableStatement.executeUpdate();
System.out.println("test_procedure : "+i);
}
}
源码下载
https://github.com/bin892550156/BinMuitlDataSource