Spring+Ibatis构建多库业务系统（一）
http://244369.blog.chinajavaworld.com/entry/4974/0/
Spring+Ibatis构建多库业务系统
一、前言
听说Spring的功能如何强大已经很久了，甚至自己非常擅长使用的Ibatis，也从V2.3以后完全拿掉了自身的Dao实现，转而推荐使用Spring的Bean实现了。于是怀着很激动地心情开始了Spring+Ibatis的整合之旅。原以为按照Spring的说明书，以及参考网友们的实践经验，一定也能很快搭建出全新的开发架构。然而，遇见的问题之多，确实也让自己始料未及。下面把一步步的构建过程记录下来，一方面是对前一阶段工作的一个总结，另外一方面也期望更多的高手能够指点一二。
二、此架构适用的范围
此架构基于Spring+Ibatis整合而成，在最初的设计中，我期望这个架构能够不仅仅做基本的SQL操作，而且能够比较方便地扩展更多的数据库进入这个架构，并且能够实现单库或多库的事务处理。基于很多应用服务器并不支持JTATransactionManager(如Tomcat), 我采用JdbcTransactionManager实现单库或多库的事务处理。所以这个架构适用于基于JdbcTransactionManager实现单库或多库事务处理的情况。
三、搭建架构过程
1． 确定搭建成功的目标
下面的搭建过程已实现多库的事务处理成功为目标。为了验证这个目标是否完成，我们将使用Oracle和mysql两个数据库。我们将假设一个业务，业务的步骤是同时向oracle库中的offered表和test表写入测试数据，向mysql库中的contact表写入数据。如果此业务的每一个步骤都执行成功，数据将写入数据库。如果此业务的任何一个步骤出错，那么两个数据库都将执行回滚，数据将不写入数据库。
2． 初始化数据库
1)初始化oracle
1234567891011121314151617181920212223 --创建offered表主键所需的序列
create sequence SEQ_FA_ID minvalue 1 maxvalue 9999999999
start with 1 increment by 1 cache 20;
--创建表offered
create table OFFERED
(
ID NUMBER not null,
CONTACTMAN VARCHAR2(64) not null,
CONTACTTEL VARCHAR2(64),
CONTACTEMAIL VARCHAR2(128),
ORGANIZATION VARCHAR2(128),
LOCATION VARCHAR2(128),
OFFEREDAMOUNT NUMBER default 0,
OFFEREDWISH VARCHAR2(512),
primary key(ID)
);
--创建表test
create table TEST
(
NAME VARCHAR2(128),
INPUTTIME DATE default sysdate,
CONTENT CLOB
);
2）初始化mysql
需要注意的是，mysql数据库的InnoDB类型库才支持事务处理。
1234567891011 CREATE TABLE contact(
id int(11) NOT NULL auto_increment,
contactMan varchar(64) NOT NULL,
contactTel varchar(64) default NULL,
contactEmail varchar(128) default NULL,
organization varchar(128) default NULL,
location text,
offeredAmount int(11) default 0,
offeredWish text,
PRIMARY KEY (id)
) ENGINE=InnoDB
3．创建数据对象DataObject
1）结构图
2）创建抽象类DataObject
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566 /**
* DataObject.java
* Abstract class for all DataObject
* Copyright 2008
* $Author: Lawrence Lin $
*/
package supercms.domain;
import java.util.Date;
import supercms.util.Message;
public abstract class DataObject{
protected boolean checked;
protected String inputbyman;
protected Date inputDate;
protected String modifiedby;
protected Date modifiedDate;
protected String ipAddress;
protected Message echoMessage;
public Message getEchoMessage() {
return echoMessage;
}
public void setEchoMessage(Message echoMessage) {
this.echoMessage = echoMessage;
}
public Date getInputDate() {
return inputDate;
}
public void setInputDate(Date inputDate) {
this.inputDate = inputDate;
}
public DataObject(){
checked = false;
}
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
}
public String getInputbyman() {
return inputbyman;
}
public void setInputbyman(String inputbyman) {
this.inputbyman = inputbyman;
}
public String getModifiedby() {
return modifiedby;
}
public void setModifiedby(String modifiedby) {
this.modifiedby = modifiedby;
}
public Date getModifiedDate() {
return modifiedDate;
}
public void setModifiedDate(Date modifiedDate) {
this.modifiedDate = modifiedDate;
}
public String getIpAddress() {
return ipAddress;
}
public void setIpAddress(String ipAddress) {
this.ipAddress = ipAddress;
}
}
3）创建数据对象Offered
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273 package supercms.domain;
public class Offered extends DataObject{
private int id;
private String contactMan;
private String contactTel;
private String contactEmail;
private String organization;
private String location;
private int offeredAmount;
private String offeredWish;
public Offered(){
super();
}
public void init(){
}
public void copy(Offered source){
}
public String getContactEmail() {
return contactEmail;
}
public void setContactEmail(String contactEmail) {
this.contactEmail = contactEmail;
}
public String getContactMan() {
return contactMan;
}
public void setContactMan(String contactMan) {
this.contactMan = contactMan;
}
public String getContactTel() {
return contactTel;
}
public void setContactTel(String contactTel) {
this.contactTel = contactTel;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public int getOfferedAmount() {
return offeredAmount;
}
public void setOfferedAmount(int offeredAmount) {
this.offeredAmount = offeredAmount;
}
public String getOfferedWish() {
return offeredWish;
}
public void setOfferedWish(String offeredWish) {
this.offeredWish = offeredWish;
}
public String getOrganization() {
return organization;
}
public void setOrganization(String organization) {
this.organization = organization;
}
}
4）创建数据对象 Test
1234567891011121314151617181920 package supercms.domain;
public class Test extends DataObject {
private String name;
private String content;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
5）创建数据对象 Contact
为了方便，我们使用和Offered一样的数据结构
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172 package supercms.domain;
public class Contact extends DataObject{
private int id;
private String contactMan;
private String contactTel;
private String contactEmail;
private String organization;
private String location;
private int offeredAmount;
private String offeredWish;
public Contact(){
super();
}
public void init(){
}
public void copy(Contact source){
}
public String getContactEmail() {
return contactEmail;
}
public void setContactEmail(String contactEmail) {
this.contactEmail = contactEmail;
}
public String getContactMan() {
return contactMan;
}
public void setContactMan(String contactMan) {
this.contactMan = contactMan;
}
public String getContactTel() {
return contactTel;
}
public void setContactTel(String contactTel) {
this.contactTel = contactTel;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public int getOfferedAmount() {
return offeredAmount;
}
public void setOfferedAmount(int offeredAmount) {
this.offeredAmount = offeredAmount;
}
public String getOfferedWish() {
return offeredWish;
}
public void setOfferedWish(String offeredWish) {
this.offeredWish = offeredWish;
}
public String getOrganization() {
return organization;
}
public void setOrganization(String organization) {
this.organization = organization;
}
}
4．编写Ibatis的sqlmap文件
1) 配置oracle数据库对应的sqlmap文件；
文件offered.xml
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768 <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="Oracle">
<typeAlias alias="Offered" type="supercms.domain.Offered"/>
<typeAlias alias="Test" type="supercms.domain.Test"/>
<insert id="insertOffered" parameterClass="Offered">
<selectKey resultClass="int" keyProperty="id" >
SELECT SEQ_FA_ID.nextval AS id FROM DUAL
</selectKey>
INSERT INTO offered(
id,contactMan,contactTel,contactEmail,
organization,location,offeredAmount,offeredWish
)VALUES(
#id#,#contactMan#,#contactTel#,#contactEmail#,
#organization#,#location#,#offeredAmount#,#offeredWish#
)
</insert>
<update id="updateOffered" parameterClass="Offered">
UPDATE offered set
contactMan=#contactMan#,
contactTel=#contactTel#,
contactEmail=#contactEmail#,
organization=#organization#,
location=#location#,
offeredAmount=#offeredAmount#,
offeredWish=#offeredWish#
WHERE id=#id#
</update>
<delete id="deleteOffered" parameterClass="java.lang.Integer">
delete from offered WHERE id = #id#
</delete>
<select id="QueryOneOffered" resultClass="Offered" parameterClass="java.lang.Integer">
SELECT id,contactMan,contactTel,contactEmail,
organization,location,offeredAmount,offeredWish
FROM offered
WHERE id = #id#
</select>
<select id="QueryOffered" resultClass="Offered" parameterClass="Offered">
SELECT id,contactMan,contactTel,contactEmail,
organization,location,offeredAmount,offeredWish
FROM offered where 1=1
<isNotEmpty prepend="AND" property="contactMan">
contactMan = #contactMan#
</isNotEmpty>
ORDER BY id
</select>
<select id="CountOffered" parameterClass="Offered" resultClass="int">
SELECT count(*) as rowsnum
FROM offered where 1=1
<isNotEmpty prepend="AND" property="contactMan">
contactMan = #contactMan#
</isNotEmpty>
</select>
<insert id="insertTest" parameterClass="Test">
insert into test(name,inputtime,content)
values(#name#,sysdate,#content,javaType=java.lang.String,jdbcType=CLOB#)
</insert>
</sqlMap>
文件sqlmapconfig.xml
123456789 <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
<sqlMapConfig>
<!-- SQL Map XML configuration -->
<sqlMap resource="supercms/resource/sqlmap/ora/offered.xml"/>
</sqlMapConfig>
2）配置mysql数据库对应的sqlmap文件
文件contact.xml
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061 <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="mysql">
<typeAlias alias="Contact" type="supercms.domain.Contact"/>
<insert id="insertContact" parameterClass="Contact">
INSERT INTO contact(
id,contactMan,contactTel,contactEmail,
organization,location,offeredAmount,offeredWish
)VALUES(
#id#,#contactMan#,#contactTel#,#contactEmail#,
#organization#,#location#,#offeredAmount#,#offeredWish#
)
</insert>
<update id="updateContact" parameterClass="Contact">
UPDATE contact set
contactMan=#contactMan#,
contactTel=#contactTel#,
contactEmail=#contactEmail#,
organization=#organization#,
location=#location#,
offeredAmount=#offeredAmount#,
offeredWish=#offeredWish#
WHERE id=#id#
</update>
<delete id="deleteContact" parameterClass="java.lang.Integer">
delete from contact WHERE id = #id#
</delete>
<select id="QueryOneContact" resultClass="Contact" parameterClass="java.lang.Integer">
SELECT id,contactMan,contactTel,contactEmail,
organization,location,offeredAmount,offeredWish
FROM contact
WHERE id = #id#
</select>
<select id="QueryContacts" resultClass="Contact" parameterClass="Contact">
SELECT id,contactMan,contactTel,contactEmail,
organization,location,offeredAmount,offeredWish
FROM offered where 1=1
<isNotEmpty prepend="AND" property="contactMan">
contactMan = #contactMan#
</isNotEmpty>
ORDER BY id
</select>
<select id="CountContacts" parameterClass="Contact" resultClass="int">
SELECT count(*) as rowsnum
FROM offered where 1=1
<isNotEmpty prepend="AND" property="contactMan">
contactMan = #contactMan#
</isNotEmpty>
</select>
</sqlMap>