Mybatis to increase delete change and paging query methods

The predecessor of MyBatis is iBatis. Is a data persistence layer (ORM) framework. MyBatis is an excellent persistence layer framework that supports normal SQL queries, stored procedures, and advanced mappings. MyBatis eliminates almost all manual setting of JDBC code and parameters and retrieval of result sets. MyBatis USES simple XML or annotations for configuration and raw mapping, mapping the interface and Java POJOs (Plan Old Java Objects, plain Java Objects) to records in the database. Each MyBatis application is mainly using SqlSessionFactory instance, a SqlSessionFactory instance can be obtained through SqlSessionFactoryBuilder.

The specific code is as follows:

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-config.dtd"> 
<configuration> 
<typeAliases> 
<!-- give a alias for model --> 
<typeAlias alias="goods" type="com.clark.model.Goods"></typeAlias> 
</typeAliases> 
<environments default="development"> 
<environment id="development"> 
<transactionManager type="JDBC" /> 
<dataSource type="POOLED"> 
<property name="driver" value="oracle.jdbc.driver.OracleDriver" /> 
<property name="url" value="jdbc:oracle:thin:@172.30.0.125:1521:oradb01" /> 
<property name="username" value="settlement" /> 
<property name="password" value="settlement" /> 
</dataSource> 
</environment> 
</environments> 
<mappers> 
<mapper resource="com/clark/model/goodsMapper.xml" /> 
</mappers> 
</configuration>
<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 
<mapper namespace="clark"> 
<!--  will db The results of the query map to Model--Goods --> 
<resultMap type="com.clark.model.Goods" id="t_good"> 
<id column="id" property="id"/> 
<result column="cate_id" property="cateId"/> 
<result column="name" property="name"/> 
<result column="price" property="price"/> 
<result column="description" property="description"/> 
<result column="order_no" property="orderNo"/> 
<result column="update_time" property="updateTime"/> 
</resultMap> 
<!--  According to the id The query   return Goods type  <typeAlias alias="goods" type="com.clark.model.Goods"></typeAlias>--> 
<!--resultMap  and  resultType Differences in use --> 
<select id="selectGoodById" parameterType="int" resultType="goods"> 
select id,cate_id,name,price,description,order_no,update_time 
from goods where id = #{id} 
</select> 
<!--  Query all Goods  return resultMap type --> 
<select id="selectAllGoods" resultMap="t_good"> 
select id,cate_id,name,price,description,order_no,update_time from goods 
</select> 
<!--  The specified parameterType=map  Among them map The form of a Map<String,PageBean> map--> 
<select id="selectGoodsByPage" resultMap="t_good" parameterType="map"> 
<!-- order by id asc Sort the results of a query in ascending order  --> 
<![CDATA[ 
select * from 
(select g.*,rownum rn from (select * from goods) g where 1=1 and rownum <= #{pageBean.endNumber}) 
where rn >= #{pageBean.startNumber}
order by id asc
]]> 
</select> 
<!--  new Goods  The parameter type is Goods--> 
<insert id="insertGood" parameterType="goods"> 
insert into goods(id,cate_id,name,price,description,order_no,update_time) 
values(#{id},#{cateId},#{name},#{price},#{description},#{orderNo},#{updateTime}) 
</insert> 
<!--  update Goods  The parameter type is Goods--> 
<update id="updateGood" parameterType="goods"> 
update goods g 
set g.name = #{name},g.order_no =#{orderNo} 
where g.id = #{id} 
</update> 
<!--  delete Goods  The parameter type is int--> 
<delete id="deleteGood" parameterType="int"> 
delete from goods g 
where g.id = #{id} 
</delete> 
</mapper>
package com.clark.model; 
import java.util.Date; 
public class Goods { 
private Integer id; 
private Integer cateId; 
private String name; 
private double price; 
private String description; 
private Integer orderNo; 
private Date updateTime; 
public Goods(){ 
} 
public Goods(Integer id, Integer cateId, String name, double price, 
String description, Integer orderNo, Date updateTime) { 
super(); 
this.id = id; 
this.cateId = cateId; 
this.name = name; 
this.price = price; 
this.description = description; 
this.orderNo = orderNo; 
this.updateTime = updateTime; 
} 
public Integer getId() { 
return id; 
} 
public void setId(Integer id) { 
this.id = id; 
} 
public Integer getCateId() { 
return cateId; 
} 
public void setCateId(Integer cateId) { 
this.cateId = cateId; 
} 
public String getName() { 
return name; 
} 
public void setName(String name) { 
this.name = name; 
} 
public double getPrice() { 
return price; 
} 
public void setPrice(double price) { 
this.price = price; 
} 
public String getDescription() { 
return description; 
} 
public void setDescription(String description) { 
this.description = description; 
} 
public Integer getOrderNo() { 
return orderNo; 
} 
public void setOrderNo(Integer orderNo) { 
this.orderNo = orderNo; 
} 
public Date getTimeStamp() { 
return updateTime; 
} 
public void setTimeStamp(Date updateTime) { 
this.updateTime = updateTime; 
} 
@Override 
public String toString() { 
return "[goods include:Id="+this.getId()+",name="+this.getName()+ 
",orderNo="+this.getOrderNo()+",cateId="+this.getCateId()+ 
",updateTime="+this.getTimeStamp()+"]"; 
} 
}

package com.clark.model; 
//Mock a paging object PageBean
public class PageBean { 
//Began to count the
private Integer startNumber; 
//End of the number
private Integer endNumber; 
public PageBean(){ 
} 
public PageBean(Integer startNumber, Integer endNumber) { 
super(); 
this.startNumber = startNumber; 
this.endNumber = endNumber; 
} 
public Integer getStartNumber() { 
return startNumber; 
} 
public void setStartNumber(Integer startNumber) { 
this.startNumber = startNumber; 
} 
public Integer getEndNumber() { 
return endNumber; 
} 
public void setEndNumber(Integer endNumber) { 
this.endNumber = endNumber; 
} 
}
package com.clark.mybatis; 
import java.io.IOException; 
import java.io.Reader; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import org.apache.ibatis.io.Resources; 
import org.apache.ibatis.session.SqlSession; 
import org.apache.ibatis.session.SqlSessionFactory; 
import org.apache.ibatis.session.SqlSessionFactoryBuilder; 
import com.clark.model.Goods; 
import com.clark.model.PageBean; 
public class TestGoods { 
public static void main(String[] args) throws IOException { 
String resource = "configuration.xml"; 
Reader reader = null; 
SqlSessionFactory sessionFactory = null; 
SqlSession session = null; 
try { 
reader = Resources.getResourceAsReader(resource); 
sessionFactory = new SqlSessionFactoryBuilder().build(reader); 
session = sessionFactory.openSession(); 
PageBean pageBean = new PageBean(8, 20); 
Map<String,PageBean> map = new HashMap<String, PageBean>(); 
map.put("pageBean", pageBean); 
List<Goods> gs = findGoodsByPage(session,map); 
for (Goods goods2 : gs) { 
System.out.println(goods2.toString()); 
} 
} catch (IOException e) { 
e.printStackTrace(); 
}finally{ 
session.close(); 
reader.close(); 
} 
} 
//find by id 
public static Goods findGoodById(SqlSession session,Integer id){ 
//Clark corresponds to the namespace name="clark" in the goodmapper.xml configuration file
Goods goods = (Goods)session.selectOne("clark.selectGoodById", id); 
return goods; 
} 
//find all 
public static List<Goods> findAllGoods(SqlSession session){ 
List<Goods> goods = session.selectList("clark.selectAllGoods"); 
return goods; 
} 
public static List<Goods> findGoodsByPage(SqlSession session,Map<String,PageBean> map){ 
List<Goods> goods = session.selectList("clark.selectGoodsByPage",map); 
return goods; 
} 
//insert a goods 
public static int insertGoods(SqlSession session,Goods goods){ 
int result = session.insert("clark.insertGood", goods); 
session.commit(); 
return result; 
} 
//update goods 
public static int updateGoods(SqlSession session,Goods goods){ 
int result = session.update("clark.updateGood", goods); 
session.commit(); 
return result; 
} 
//delete goods 
public static int deleteGood(SqlSession session,Integer id){ 
int result = session.delete("clark.deleteGood", id); 
session.commit(); 
return result; 
} 
}

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