系列５：SQLDB

文档：https://www.ng.bluemix.net/docs/#services/SQLDB/index.html#SQLDB
这文档已经根不上bluemix的节奏了

比如cf create-service sqldb sqldb_small mySQLDB会报错，这里的service name及,plan都已经换成别的了．（坑）

正确的方式是：
cf create-service SQLDB SQLDB_OpenBeta SQLDB-cyper
绑定
cf bind-service cyperhellotest SQLDB-cyper

另外SQLDB和MYSQL的VCAP中的ＪＳＯＮ格式竟然不一致．（坑）

最终的server.xml如下（双数据源）

<server description="new server">

	<!-- Enable features -->
	<featureManager>
		<feature>servlet-3.0</feature>
		<feature>jdbc-4.0</feature>
	</featureManager>

	<dataSource id="blogDS" jndiName="jdbc/blogDS" connectionManagerRef="mysqlPool" jdbcDriverRef="mysqlDriver">
		<properties
		databaseName="${cloud.services.mysql-cyper.connection.name}"
		serverName="${cloud.services.mysql-cyper.connection.host}"
		portNumber="${cloud.services.mysql-cyper.connection.port}"
		user="${cloud.services.mysql-cyper.connection.user}"
		password="${cloud.services.mysql-cyper.connection.password}" />
	</dataSource>

	<connectionManager id="mysqlPool" maxPoolSize="10" />

	<jdbcDriver id="mysqlDriver" libraryRef="mysqlLib" />
	<library id="mysqlLib" filesetRef="mysqlFileset" />
	<fileset id="mysqlFileset" dir="${shared.resource.dir}/mysql" includes="*.jar" />

	
	<dataSource id="db2" jndiName="jdbc/db2">
		<jdbcDriver libraryRef="DB2JCC4Lib"/>
		<properties.db2.jcc databaseName="${cloud.services.SQLDB-cyper.connection.db}"
		serverName="${cloud.services.SQLDB-cyper.connection.host}"
		portNumber="${cloud.services.SQLDB-cyper.connection.port}"
		user="${cloud.services.SQLDB-cyper.connection.username}"
		password="${cloud.services.SQLDB-cyper.connection.password}" />
	</dataSource>
	<library id="DB2JCC4Lib">
		<fileset dir="${shared.resource.dir}/db2" includes="*.jar"/>
	</library>
	
	
	<webApplication name="helloworld" location="helloworld.war" />

	<httpEndpoint id="defaultHttpEndpoint" host="localhost" httpPort="9080" httpsPort="9443" />
</server>

启动时有个警告（但不影响使用）

W, [2014-06-24T10:31:40.008717 #67]  WARN -- /var/vcap/data/dea_next/admin_buildpacks/d057633b-5220-4d97-96f2-a6f35ace84d7_1ee
83696f1a6979f847cc0b952274974241861e4/lib/liberty_buildpack/container/services_manager.rb:133:in `rescue in block in update_configuration': Failed to update the configuration for a service. Details are  The datasource configuration for service SQLDB-cyper is inconsistent

bluemix docs中曾经写过．bluemix能自动注入SQLDB/MONGO,的连接信息，但前提是必须删除以上mysql的配置
如下：

<server description="new server">

	<!-- Enable features -->
	<featureManager>
		<feature>servlet-3.0</feature>
		<feature>jdbc-4.0</feature>
	</featureManager>

	<dataSource id="db2" jndiName="jdbc/db2">
		<jdbcDriver libraryRef="DB2JCC4Lib"/>
		<properties.db2.jcc databaseName="SAMPLE"
		serverName="localhost"
		portNumber="50000"
		user="db2admin"
		password="db2admin" />
	</dataSource>
	<library id="DB2JCC4Lib">
		<fileset dir="${shared.resource.dir}/db2" includes="*.jar"/>
	</library>
	
	
	<webApplication name="helloworld" location="helloworld.war" />

	<httpEndpoint id="defaultHttpEndpoint" host="localhost" httpPort="9080" httpsPort="9443" />
</server>

以上的server.xml如果push，运行正常，没有任何警告

HelloServlet.java代码如下：

package test;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

@WebServlet("/HelloServlet")
public class HelloServlet extends HttpServlet {

	@Resource(name = "jdbc/blogDS")
	private DataSource ds;
	
	@Resource(name = "jdbc/db2")
	private DataSource ds2;

	private Connection con;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<H1>Hello World Liberty Profile</H1>\n");
		try {
			con = ds.getConnection();
			Statement stmt = null;
			stmt = con.createStatement();
			
			//drop table first~ in case table already exists
			stmt.executeUpdate("drop table if exists cities");
			
			// create a table
			stmt.executeUpdate("create table cities (name varchar(50) not null primary key, population int, county varchar(30))");
			// insert a test record
			stmt.executeUpdate("insert into cities values ('myHomeCity', 106769, 'myHomeCounty')");
			// select a record
			ResultSet result = stmt
					.executeQuery("select county from cities where name='myHomeCity'");
			result.next();
			// display the county information for the city.
			out.println("The county for myHomeCity is " + result.getString(1));
			// drop the table to clean up and to be able to rerun the test.
			stmt.executeUpdate("drop table cities");
			
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			if (con != null) {
				try {
					con.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
		
		
		out.println("<H1>Hello World from DB2</H1>\n");
		try {
			con = ds2.getConnection();
			Statement stmt = null;
			stmt = con.createStatement();
			
			// create a table
			stmt.executeUpdate("create table cities (name varchar(50) not null primary key, population int, county varchar(30))");
			// insert a test record
			stmt.executeUpdate("insert into cities values ('myHomeCity', 106769, 'myHomeCounty')");
			// select a record
			ResultSet result = stmt
					.executeQuery("select county from cities where name='myHomeCity'");
			result.next();
			// display the county information for the city.
			out.println("The DB2 county for myHomeCity is " + result.getString(1));
			// drop the table to clean up and to be able to rerun the test.
			stmt.executeUpdate("drop table cities");
			
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			if (con != null) {
				try {
					con.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}

	}
}

哦对了．service.xml中对应的db2驱动在此．
C:\IBM\was855nalp\usr\shared\resources\db2\db2jcc.jar
这个jar包是从bluemix UI中java+db的boilerplate code是拷贝出来的

单机版server.xml的配置如下：

<server description="new server">

	<!-- Enable features -->
	<featureManager>
		<feature>servlet-3.0</feature>
		<feature>jdbc-4.0</feature>
	</featureManager>

	<dataSource id="blogDS" jndiName="jdbc/blogDS" connectionManagerRef="mysqlPool" jdbcDriverRef="mysqlDriver">
		<properties databaseName="test" serverName="localhost" portNumber="3306" />
	</dataSource>

	<connectionManager id="mysqlPool" maxPoolSize="10" />

	<jdbcDriver id="mysqlDriver" libraryRef="mysqlLib" />
	<library id="mysqlLib" filesetRef="mysqlFileset" />
	<fileset id="mysqlFileset" dir="${shared.resource.dir}/mysql" includes="*.jar" />

	
	<dataSource id="db2" jndiName="jdbc/db2">
		<jdbcDriver libraryRef="DB2JCC4Lib"/>
		<properties.db2.jcc databaseName="SAMPLE"
		serverName="localhost"
		portNumber="50000"
		user="db2admin"
		password="db2admin" />
	</dataSource>
	<library id="DB2JCC4Lib">
		<fileset dir="${shared.resource.dir}/db2" includes="*.jar"/>
	</library>
	
	
	<webApplication name="helloworld" location="helloworld.war" />

	<httpEndpoint id="defaultHttpEndpoint" host="localhost" httpPort="9080" httpsPort="9443" />
</server>

参考：http://www-01.ibm.com/support/knowledgecenter/api/content/SSEQTP_8.5.5/com.ibm.websphere.wlp.doc/ae/twlp_dep_configuring_ds.html

https://www.ng.bluemix.net/docs/#services/SQLDB/index.html#SQLDB