ibatis結果集resultClass的幾種類型

原創

2020-02-22 00:18

ibatis在編寫sqlmap的查詢時，可以配置多種輸出格式，比如：實體類，hashmap，xml格式。
sqlmap中的hashmap和xml都是內置別名.

1.實體類：

//xml配置
<resultMap id="UserResult" class="User">
<result property="id" column="T_ID"/> 
<result property="name" column="T_NAME"/>
<result property="sex" column="T_SEX"/> 
<result property="address" column="T_ADDRESS"/>
</resultMap>
<select id="selectAllUser" resultMap="UserResult"> 
select * from t_user </select>
//java
List list = userdao.selectAllUser(); 
for(int i=0;i<list.size();i++) { 
    System.out.println(list.get(i)); 
}
注：當作一個對象使用。

2.hashmap:

//xml配置
<select id="selectAllUser" resultClass="hashmap"> select * from t_user </select> 
//java
List list = userdao.selectAllUser();
for(int i=0;i<list.size();i++) {
    Map map = (Map)list.get(i);
    System.out.print(map.get("id")+" ");
    System.out.print(map.get("name")+" ");
    System.out.print(map.get("sex")+" ");
    System.out.print(map.get("address"));
    System.out.println();
}
注：當作一個鍵值對的MAP使用。

3.XML：

//XML配置
<select id="selectXML" resultClass="xml" xmlResultName="log"> select * from t_user </select>
//Java
List list = userdao.selectAllUser();
for(int i=0;i<list.size();i++) {
    System.out.println(list.get(i));
}
//xml輸出結果
<?xml version="1.0" encoding="UTF-8"?><log><id>1</id><name>hua</name><***>1</***><address>1</address></log>
<?xml version="1.0" encoding="UTF-8"?><log><id>2</id><name> zhupan </name><***>2</***><address>1</address></log>
<?xml version="1.0" encoding="UTF-8"?><log><id>4</id><name> 4 </name><***>4</***><address>1</address></log>
<?xml version="1.0" encoding="UTF-8"?><log><id>5</id><name> 5 </name><***>5</***><address>2</address></log>