???????? iBatis并不在運行期自動生成SQL語句，具體的SQL語句由程序員編寫。通過映射文件，將SQL所需的參數，以及返回的結果字段映射到指定的POJO。相對于Hibernate等"全自動"ORM而言，iBatis以SQL開發的工作量和數據庫移植性上的讓步，為系統設計提供了更大的自由空間。
??????? 一個簡單的iBatis例子程序。
1.數據庫表結構。
use?sample;
DROP?TABLE?T_User;
CREATE?TABLE?T_User?(
???????id?INT?NOT?NULL
?????,?name?VARCHAR(20)
?????,?sex?INT
?????,?PRIMARY?KEY?(id)
);
2.POJO類
package?com.iBatis.sample;
import?java.io.Serializable;
public?class?User?implements?Serializable?{
????private?Integer?id;
????private?String?name;
????private?Integer?sex;
????
????public?User(){
????????
????}
????
????public?Integer?getId()?{
????????return?id;
????}
????public?void?setId(Integer?id)?{
????????this.id?=?id;
????}
????public?String?getName()?{
????????return?name;
????}
????public?void?setName(String?name)?{
????????this.name?=?name;
????}
????public?Integer?getSex()?{
????????return?sex;
????}
????public?void?setSex(Integer?sex)?{
????????this.sex?=?sex;
????}
????
}
3.配置文件
SqlMapConfig.xml
<?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">?
<sqlMapConfig>?
????????????????????
????<settings?
????????cacheModelsEnabled="true"?
????????enhancementEnabled="true"?
????????lazyLoadingEnabled="true"?
????????maxRequests="32"?
????????maxSessions="10"?
????????maxTransactions="5"?
????????useStatementNamespaces="false"?
????/>?
?????
????<transactionManager?type="JDBC"?>?
????????<dataSource?type="SIMPLE">?
????????????<property?name="JDBC.Driver"?value="com.p6spy.engine.spy.P6SpyDriver"/>?
????????????<property?name="JDBC.ConnectionURL"?value="jdbc:mysql://localhost:3306/sample"/>?
????????????<property?name="JDBC.Username"?value="root"/>?
????????????<property?name="JDBC.Password"?value="1234"/>?
????????????<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?ACCOUNT"/>?
????????????<property?name="Pool.PingEnabled"?value="false"/>?
????????????<property?name="Pool.PingConnectionsOlderThan"?value="1"/>?
????????????<property?name="Pool.PingConnectionsNotUsedFor"?value="1"/>?
????????</dataSource>?
????</transactionManager>?
????<sqlMap?resource="com/iBatis/sample/User.xml"?/>?
????????????????????????????????????????
</sqlMapConfig>?
User.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="User">?
?
????<typeAlias?alias="user"?type="com.iBatis.sample.User"?/>
?
????<select?id="getUser"
????????parameterClass="java.lang.String"
????????resultClass="user">
????????<![CDATA[
????????????select
??????????????name,
??????????????sex
????????????from?t_user
????????????where?name=?#name#
????????]]>
????</select>
????
????<update?id="updateUser"
????????parameterClass="user">
????????<![CDATA[
????????????update?t_user
??????????????set
??????????????name=#name#,
??????????????sex=#sex#
????????????where?id=#id#
????????]]>
????</update>????
????
????<insert?id="insertUser"
????????parameterClass="user">
????????<![CDATA[
????????????insert?into?t_user?(
??????????????name,
??????????????sex=)
????????????values?(
??????????????#name#,
??????????????#sex#
????????????)
????????]]>
????</insert>????
????
????<delete?id="deleteUser"
????????parameterClass="java.lang.String">
????????<![CDATA[
????????????delete?from?t_user
????????????where?id?=?#id#
????????]]>
????</delete>????????????
????
</sqlMap>?
4.測試類
MyTest.java
package?com.iBatis.sample;
import?java.io.IOException;
import?java.io.Reader;
import?java.sql.SQLException;
import?junit.framework.TestCase;
import?com.ibatis.common.resources.Resources;
import?com.ibatis.sqlmap.client.SqlMapClient;
import?com.ibatis.sqlmap.client.SqlMapClientBuilder;
public?class?MyTest?extends?TestCase{
????SqlMapClient?sqlMap?=?null;????
????
????protected?void?setUp(){
????????try?{
????????????String?resource?=?"com/iBatis/sample/SqlMapConfig.xml";
????????????Reader?reader;
????????????reader?=?Resources.getResourceAsReader(resource);
????????????sqlMap?=?SqlMapClientBuilder.buildSqlMapClient(reader);
????????}?catch?(IOException?e)?{
????????????//?TODO:?handle?exception
????????????e.printStackTrace();
????????}
????}
????
????public?void?testIBatis()?throws?Exception{
????????try?{
????????????sqlMap.startTransaction();
????????????
????????????User?user?=?new?User();
????????????user.setId(new?Integer(1));
????????????user.setName("baiyf");
????????????user.setSex(new?Integer(1));
????????????
????????????sqlMap.update("updateUser",?user);
????????????sqlMap.commitTransaction();
????????????
????????}catch(SQLException?e){
????????????e.printStackTrace();
????????}
????????finally?{
????????????sqlMap.endTransaction();
????????}
????}
}
ID指定了操作id,可以在代碼中通過指定操作id來執行此節點定義的操作。
如：
sqlMap.update("updateUser", user);
posted on 2006-07-22 17:50
knowhow 閱讀(487)
評論(1) 編輯 收藏 所屬分類:
ORM：Hibernate及其他