原文出处:http://blog.csdn.net/tenwang1977/archive/2004/08/17/76972.aspx
本文章将从一个Ibatis的具体示例,帮助你快速了解IBatis框架。
一个简单的IBatis应用包含以下基本步骤:
一、 配置文件
1. 配置SqlMapConfig.properties文件
2. 配置SqlMapConfig.xml文件
3. 配置SqlMap.xml文件(可能有多个文件,一般情况下,可以一个表对应一个SqlMap.xml文件,文件名称可以与表名相同)
注意:上面所述的SqlMapConfig.xml文件必须在类路径中,SqlMapConfig.properties和SqlMap.xml文件可以在类路径中,也可以不在类路径中。当SqlMapConfig.properties和SqlMap.xml文件不在类路径中的时候,配置也不同,在本文中,这三个文件都放在类路径中。
二、 程序调用
1. 初始化SqlMapClient对象。
2. 运行Sql语句:你可以调用SqlMapClient对象的queryfor...()、insert()、update()、delete()来分别执行select、insert、update和delete操作。
好了,下面我们结合实例进行讲解:
三、实例:
下面的例子是以mysql为例进行说明,建立了一个author表,为了方便调试代码,你可以将ibatis-common-2.jar、ibatis-dao-2.jar、ibatis-sqlmap-2.jar和lib目录下的所有的jar都加载到你的程序中,在后续的文章中,将会说明每个Jar的用途。
(一) 创建数据库和表
创建一个名字为IBatisExample的数据库
CREATE TABLE author (
auth_id int(8) NOT NULL auto_increment,
auth_name varchar(100) NOT NULL default '',
auth_age int(3) NOT NULL default '0',
auth_tel varchar(100) NOT NULL default '',
auth_address varchar(100) NOT NULL default '',
PRIMARY KEY (auth_id)
) TYPE=MyISAM;
INSERT INTO author VALUES (1, '作者一', 30, '025-12345678', '南京');
INSERT INTO author VALUES (2, '作者二', 30, '025-12345678', '南京');
(二) 配置文件
1. 配置SqlMapConfig.properties文件
文件内容:
driver=org.gjt.mm.mysql.Driver
url=jdbc:mysql://192.168.0.26:3306/IBatisExample?useUnicode=true&characterEncoding=GB2312
username=root
password=123456
2. 配置SqlMapConfig.xml文件
文件内容:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMapConfig
PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN"
"http://www.ibatis.com/dtd/sql-map-config-2.dtd">
<!-- Always ensure to use the correct XML header as above! -->
<sqlMapConfig>
<!-- The properties (name=value) in the file specified here can be used placeholders in this config
file (e.g. “${driver}”. The file is relative to the classpath and is completely optional. -->
<properties resource="SqlMapConfig.properties" />
<!-- These settings control SqlMapClient configuration details, primarily to do with transaction
management. They are all optional (more detail later in this document). -->
<settings
cacheModelsEnabled="true"
enhancementEnabled="true"
lazyLoadingEnabled="true"
maxRequests="32"
maxSessions="10"
maxTransactions="5"
useStatementNamespaces="false"
/>
<!-- Configure a datasource to use with this SQL Map using SimpleDataSource.
Notice the use of the properties from the above resource -->
<transactionManager type="JDBC" >
<dataSource type="SIMPLE">
<property name="JDBC.Driver" value="${driver}"/>
<property name="JDBC.ConnectionURL" value="${url}"/>
<property name="JDBC.Username" value="${username}"/>
<property name="JDBC.Password" value="${password}"/>
<property name="JDBC.DefaultAutoCommit" value="true" />
<property name="Pool.MaximumActiveConnections" value="10"/>
<property name="Pool.MaximumIdleConnections" value="5"/>
<property name="Pool.MaximumCheckoutTime" value="120000"/>
<property name="Pool.TimeToWait" value="500"/>
<property name="Pool.PingQuery" value="select 1 from author"/>
<property name="Pool.PingEnabled" value="false"/>
<property name="Pool.PingConnectionsOlderThan" value="1"/>
<property name="Pool.PingConnectionsNotUsedFor" value="1"/>
</dataSource>
</transactionManager>
<!-- Identify all SQL Map XML files to be loaded by this SQL map. Notice the paths
are relative to the classpath. For now, we only have one… -->
<sqlMap resource="com/ibatis/sqlmap/author.xml" />
</sqlMapConfig>
3. 配置SqlMap.xml文件
这里我们命名为author.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap
PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN"
"http://www.ibatis.com/dtd/sql-map-2.dtd">
<sqlMap namespace="Author">
<typeAlias alias="Author" type="com.ibatis.beans.Author" />
<select id="getAuthor" parameterClass="int" resultClass="Author">
SELECT auth_id as id,auth_name as name,auth_age as age,auth_tel as telephone,auth_address as address FROM author WHERE auth_id = #id#
</select>
<statement id="getAllAuthor" resultMap="authorResult">
SELECT * FROM author
</statement>
<insert id="insertAuthor" parameterMap="authorParameter">
INSERT INTO author (auth_name,auth_age,auth_tel,auth_address) VALUES (?,?,?,?)
</insert>
<update id="updateAuthor" parameterClass="Author">
UPDATE author set auth_name=#name# WHERE auth_id = #id#
</update>
<delete id="deleteAuthor" parameterClass="int">
delete from author WHERE auth_id = #id#
</delete>
</sqlMap>
(三) 程序调用
由于源代码很长,所以这里我只给出一些简单的程序调用方法,所以如果有人想要源代码的话,可以留下你的邮箱。
1. 初始化一个SqlMapClient对象,代码如下:
public class SqlMapConf
{
private static SqlMapClient sqlMapClient;
static
{
try
{
System.out.println("sqlMapClient initing.....");
String resource = "SqlMapConfig.xml";
Reader reader = Resources.getResourceAsReader (resource);
sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
}
catch (Exception e)
{
e.printStackTrace();
throw new RuntimeException ("Error initializing MyAppSqlConfig class. Cause: " +e);
}
}
public static SqlMapClient getInstance()
{
return sqlMapClient;
}
}
2. 然后要为Author表写一个bean,代码如下:
public class Author
{
private int id;
private int age;
private String name;
private String address;
private String telephone;
public int getId()
{
return id;
}
public void setId(int id)
{
this.id=id;
}
public int getAge()
{
return age;
}
public void setAge(int age)
{
this.age=age;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name=name;
}
public String getAddress()
{
return address;
}
public void setAddress(String address)
{
this.address=address;
}
public String getTelephone()
{
return telephone;
}
public void setTelephone(String telephone)
{
this.telephone=telephone;
}
}
3. 程序调用:
这里将只示范一下getAuthor、insertAuthor1、updateAuthor和deleteAuthor的方法。
首先应该得到一个SqlMapClient实例:
SqlMapClient sqlMapClient = SqlMapConf.getInstance();
(1) getAuthor:
Author author = (Author)sqlMapClient.queryForObject("getAuthor", new Integer(1));
(2) getAllAuthor
List authorList = (List)sqlMapClient.queryForList("getAllAuthor", null);
(3) insertAuthor:
Author author = new Author();
author.setName("作者三");
author.setAge(31);
author.setAddress("南京");
author.setTelephone("025-987654321");
sqlMapClient.insert(operaName, author);
(4) updateAuthor
Author author = new Author();
author.setName("Updated");
author.setId(authorID);
sqlMapClient.update(operaName, author);
(5) deleteAuthor
sqlMapClient.delete("deleteAuthor", new Integer(authorID));
这里只是做一个简单的例子,希望能够帮助快速的入门,而并没有对IBatis的原理进行剖析,不过通过这几个调用,我想你可能能够猜到IBatis的一部分运作原理了,关于IBatis的原理以及高级应用,请关注后续文章。
posted on 2007-10-24 11:02
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