基于amoeba的mysql分布式数据库学习（一）

一、 下载 amoeba 代码

 

首先先到网站（ http://sourceforge.net/projects/amoeba ）上下载 amoeba for Mysql  代码。然后解压到

C:/amoeba  目录。增加系统环境变量： amoeba.home = C:/amoeba

 

二、 准备 mysql 数据库

 

Server1 ：   localhost schema: test table: test_table2

Server2 ：   10.2.224.241 schema: test table: test_table2

        

          表名称 test_table1 结构为：

                      `ID` INTEGER(11) NOT NULL,

                    `NAME` VARCHAR(250) COLLATE gbk_chinese_ci DEFAULT NULL,

        

          先插入一些模拟数据。

 

三、 修改配置文件

 

    找到amoeba.xml配置，修改mysql代理服务器配置信息：

 

 <server>
     <!-- proxy server绑定的端口 -->
     <property name="port" > 8066 </property>

     <!-- proxy server绑定的IP -->
     <property name="ipAddress" > 127.0 . 0.1 </property>

     <!-- proxy server net IO Read thread size -->
     <property name="readThreadPoolSize" > 20 </property>

     <!-- proxy server client process thread size -->
     <property name="clientSideThreadPoolSize" > 30 </property>

     <!-- mysql server data packet process thread size -->
     <property name="serverSideThreadPoolSize" > 30 </property>

     <!-- socket Send and receive BufferSize(unit:K)  -->
     <property name="netBufferSize" > 100 </property>

     <!-- Enable/disable TCP_NODELAY (disable/enable Nagle's algorithm). -->
     <property name="tcpNoDelay" > true </property>

     <!-- 对外验证的用户名 -->
     <property name="user" >root</property>

     <!-- 对外验证的密码 -->
     <property name="password" >admin</property>

 </server>

 

 

 

     我设置的监控端口为：8066。

 

    配置两个数据库服务器地址，分别对应Server1和Server2。

  

    修改查询规则文件：

 

 

 <tableRule name= "test_table2"  schema= "test"  defaultPools= "server2,server1" >


     <rule name="rule1" >
         <parameters>ID</parameters>
         <expression><![CDATA[  ID <= 20  ]]></expression>
         <defaultPools>server1</defaultPools>
         <readPools>server1</readPools>
         <writePools>server1</writePools>
     </rule>

     <rule name="rule2" >
         <parameters>ID</parameters>
         <expression><![CDATA[ ID > 20  ]]></expression>
         <defaultPools>server2</defaultPools>
         <writePools>server2</writePools>
         <readPools>server2</readPools>
     </rule>
                </tableRule>

 

 

 

    规则：以ID=20为界。

 

 

 

     OK，配置文件配置好了以后，我们可以执行：${amoeba.home}/bin/amoeba.bat ，启动代理服务器。

 

四、 编写查询代码

 

  

 import  java.sql.Connection;
 import  java.sql.DriverManager;
 import  java.sql.PreparedStatement;
 import  java.sql.ResultSet;
 import  java.sql.SQLException;
 import  java.sql.Statement;

 public   class  DataAccess {

     private  String CONNECTION_STRING =  "jdbc:mysql://localhost:8066/test" ;
 //  jdbc:mysql://localhost:8066
     private  String connErrInfo;

     private  Connection conn;

     public  DataAccess(){
         if (conn ==  null ){
             conn = GetConnObj();
         }
     }

     public  Connection GetConnObj() {
         try  {
             Class.forName("com.mysql.jdbc.Driver" );
             conn = DriverManager.getConnection(CONNECTION_STRING,"root" , "admin" );
             return  conn;
         } catch  (ClassNotFoundException ex) {
             this .connErrInfo +=  ";dbConn ex:"  + ex.toString();
             ex.printStackTrace();
         } catch  (SQLException es) {
             this .connErrInfo +=  ";dbConn es:"  + es.getMessage();
             es.printStackTrace();
         } catch  (Exception e) {
             this .connErrInfo +=  ";dbConn e:"  + e.getMessage();
             e.printStackTrace();
         }
         return   null ;
     }

     public  String commonUpdate(String rSqlString) {
         if  (conn !=  null ) {
             try  {
                 Statement stmt = conn.createStatement();
                 stmt.execute(rSqlString);
                 //conn.close();
             } catch  (SQLException e) {
                 return  e.getMessage();
             }
         }
         return   "" ;
     }



     public  ResultSet commonSelect(String rSqlString) {
         if  (conn !=  null ) {
             try  {
                 Statement stmt = conn.createStatement();
                 stmt.execute(rSqlString);
                 ResultSet result = stmt.executeQuery(rSqlString);
                 //conn.close();
                 return  result;
             } catch  (SQLException es) {
                 this .connErrInfo =  "dbProcess es:"  + es.getMessage();
             } catch  (Exception e) {
                 this .connErrInfo =  "dbProcess e:"  + e.getMessage();
             }
         }
         return   null ;
     }


     public   void  close(){
         if (conn !=  null ){
             try  {
                 conn.close();
             } catch  (SQLException e) {
                 e.printStackTrace();
             }
         }
     }

     public  String getConnErrInfo() {
         return  connErrInfo;
     }

     public   void  setConnErrInfo(String connErrInfo) {
         this .connErrInfo = connErrInfo;
     }

     public   static   void  main(String[] args)  throws  SQLException{

         DataAccess dataAccess = new  DataAccess();

         java.util.Date startDate = new  java.util.Date();
         ResultSet rs = dataAccess.commonSelect("select * from test_table2 where ID in(14,15,16,50)" );
         while (rs.next()){
             String siteName = (String)rs.getString("name" );
             System.out.println("siteName:"  + siteName );
         }
         java.util.Date endDate = new  java.util.Date();
         long  period = endDate.getTime() - startDate.getTime();
         System.out.println("耗费时间："  + period);

         dataAccess.close();
     }

     public  Connection getConn() {
         return  conn;
     }

     public   void  setConn(Connection conn) {
         this .conn = conn;
     }
 }

 

 

 

五、 查询结果

 

 siteName: 10.2 . 224 .241_test_table1_14
 siteName:10.2 . 224 .241_test_table1_15
 siteName:10.2 . 224 .241_test_table1_16
 siteName:test_table2_14
 siteName:test_table2_15
 siteName:test_table2_16
 耗费时间：156

 

 

我现在只是模拟简单的规则查询，后面我们将逐步深入了解。