iBatis 简单增删改查(CRUD)操作

最新推荐文章于 2023-07-07 23:05:32 发布

JJiaoAo

最新推荐文章于 2023-07-07 23:05:32 发布

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分类专栏： ibatis 文章标签： ibatis

本文链接：https://blog.youkuaiyun.com/JJiaoAo/article/details/84281248

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本文介绍如何使用IBatis框架简化SQL输入参数配置，通过创建ParameterMap类封装参数，并详细说明了如何在IBatis中集成和使用此类进行查询、插入、更新和删除操作。

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基于上一篇
[url]http://jiaozhiguang-126-com.iteye.com/blog/1668709[/url]

为了简化我们SQL输入参数的配置，我们写一个类来专门负责处理输入参数，把它们封装成一个Map类型，代码如下：


package ibatis.util;

import java.util.HashMap;

public class ParameterMap extends HashMap<Object, Object> {

	public ParameterMap(Object... parameters) {
		for(int i=0; i<parameters.length-1; i=i+2) {
			super.put(parameters[i], parameters[i+1]);
		}
	}
}

主要修改Dept.xml 文件和 IBatisDemo类


<?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>  
    <typeAlias alias="Dept" type="ibatis.model.Dept" />  
	<!--
    <select id="getAllDepts" resultClass="Dept">  
        select *  
        from dept  
    </select>  
	-->
	<typeAlias alias="parameterMap" type="ibatis.util.ParameterMap" />

	<select id="getAllDepts" resultClass="java.util.HashMap">  
    select *  
    from dept  
	</select>

	<select id="getDeptByName" parameterClass="java.lang.String"  
        resultClass="java.util.HashMap">  
    select *  
    from dept  
    where DNAME=#VARCHAR#  
    </select> 

	<select id="getDeptByDeptNameAndLoc" parameterClass="parameterMap"  
        resultClass="java.util.HashMap">  
    select *  
    from dept  
    where DNAME=#dName:VARCHAR# and LOC=#loc:VARCHAR#  
    </select>

	<insert id="addDept" parameterClass="parameterMap">  
    insert into dept(DEPTNO,DNAME,LOC)  
    values(#deptNo:NUMBER#,#dName:VARCHAR#,#loc:VARCHAR#)  
</insert> 

	<update id="updateDept" parameterClass="parameterMap">  
        update dept   
        set LOC=#loc:VARCHAR#  where DEPTNO=#deptNo:NUMBER#
</update>  

	<delete id="deleteDept" parameterClass="java.lang.Integer">  
    delete from dept  
    where deptNo=#INT#  
</delete> 

</sqlMap>


package ibatis;

import ibatis.util.ParameterMap;

import java.io.IOException;
import java.io.Reader;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;

public class IBatisDemo {

	private static String config = "ibatis/SqlMapConfig.xml";  
    private static Reader reader ;  
    private static SqlMapClient sqlMap;  
    static {
    	try {
			reader = Resources.getResourceAsReader(config);
		} catch (IOException e) {
			e.printStackTrace();
		}
    	sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader);
    }

	public static void main(String[] args) throws IOException, SQLException {  
		List<HashMap> list = select();
		for(HashMap dept : list) {
			System.out.println(dept);
		}
		System.out.println("------------------------------------");
		System.out.println(select("Sec")); 
		System.out.println("------------------------------------");
		ParameterMap parameterMap = new ParameterMap("dName", "Adv","loc", "Beijing");  
        System.out.println(select(parameterMap));
        System.out.println("------------------------------------");
        System.out.println(delete(91)); 
        System.out.println("------------------------------------");
        parameterMap = new ParameterMap("deptNo", "91","dName", "财务部", "loc", "哈尔滨");  
        System.out.println(insert(parameterMap)); 
        System.out.println("------------------------------------");
        parameterMap = new ParameterMap("deptNo", "91", "loc", "haerbin");
        System.out.println(update(parameterMap));
    }  

	public static int delete(int deptNo) throws SQLException {  
	    return sqlMap.delete("deleteDept", deptNo);  
	}  

	public static int update(Map parameterMap) throws SQLException {  
	    return sqlMap.update("updateDept", parameterMap);  
	}  

	public static int insert(Map parameterMap) throws SQLException {  
        return sqlMap.update("addDept", parameterMap);  
	}  

	public static HashMap select(Map parameterMap) throws SQLException {
		return (HashMap) sqlMap.queryForObject("getDeptByDeptNameAndLoc",  
            parameterMap);  
		}  

	 public static HashMap select(String parameter) throws SQLException {        
		 return (HashMap) sqlMap.queryForObject("getDeptByName", parameter);  
	 }  

	public static List<HashMap> select() throws SQLException {
		return sqlMap.queryForList("getAllDepts");
	}

}