轉自：http://taojintianxia-ibatis.group.iteye.com/group/wiki
對任何數據庫程序來說,添加,更新,刪除都是十分常見且必要的特性.在該教程裏我們已經講解了使用iBatis在Java中進行插入和刪除操作,現在本章將講述如何使用iBatis在數據表中更新數據.在iBatis中執行一條更新語句是非常簡單的.爲了更新數據你得在SQL映射文件"Contact.xml"中添加SQL的update語句.
iBatis更新語句例子 :
Contact.java
public class Contact {
private String firstName;
private String lastName;
private String email;
private int id;
public Contact() {}
public Contact(
String firstName,
String lastName,
String email) {
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
SqlMapConfig.xml
<?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>
<settings useStatementNamespaces="true"/>
<transactionManager type="JDBC">
<dataSource type="SIMPLE">
<property name="JDBC.Driver" value="com.mysql.jdbc.Driver"/>
<property name="JDBC.ConnectionURL"
value="jdbc:mysql://192.168.10.112:3306/vin"/>
<property name="JDBC.Username" value="root"/>
<property name="JDBC.Password" value="root"/>
</dataSource>
</transactionManager>
<sqlMap resource="Contact.xml"/>
</sqlMapConfig>
iBatis更新查詢
在我們的例子中,我們通過參數中指定的id更新了表中的數據,因此對於"id"我們將"parameterClass"的屬性值分配爲"long".
Contact.xml
<?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="Contact">
<!--- Showing all data of table -->
<select id="getAll" resultClass="Contact">
select * from contact
</select>
<!--- Update data of Contact table -->
<update id="updateById" parameterClass="long">
update Contact
set
lastName = 'Raghuwanshi'
where
id=#id#
</update>
</sqlMap>
現在我們可以在Java程序中通過如下代碼執行更新操作了 :
sqlMap.update("Contact.updateById",contactId);
IbatisUpdate.java代碼如下 :
import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import java.io.*;
import java.sql.SQLException;
import java.util.*;
public class IbatisUpdate{
public static void main(String[] args)
throws IOException,SQLException{
Reader reader = Resources.getResourceAsReader(
"SqlMapConfig.xml"
);
SqlMapClient sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader);
//Updating one record of contact
System.out.println("*---- Updating informations of Contact -----*");
Contact contct=new Contact();
long contactId=1;
sqlMap.update("Contact.updateById",contactId);
System.out.println("|Updated Record Successfully ");
System.out.println("All Contacts");
List<Contact> contacts = (List<Contact>)
sqlMap.queryForList("Contact.getAll",null);
Contact contact = null;
for (Contact c : contacts) {
System.out.print(" " + c.getId());
System.out.print(" " + c.getFirstName());
System.out.print(" " + c.getLastName());
System.out.print(" " + c.getEmail());
contact = c;
System.out.println("");
}
System.out.println("============================================");
}
}
爲了執行update的例子,遵照如下步驟 :
創建Contact.java和SqlMapConfig.xml
編譯Contact.java
創建Contact.xml
創建IbatisUpdate.java並將其編譯
執行IbatisUpdate類文件,你會得到如下輸出 :
