MyBatis存储过程、MyBatis分页、MyBatis一对多增删改查操作

一、用到的实体类如下：

student.java

package com.company.entity; 
import java.io.serializable; 
import java.util.date; 
public class student implements serializable{ 
private static final long serialversionuid = 1l; 
private int id; 
private string name; 
private date birth; 
private group group; 
public group getgroup() { 
return group; 
} 
public void setgroup(group group) { 
this.group = group; 
} 
public int getid() { 
return id; 
} 
public void setid(int id) { 
this.id = id; 
} 
public string getname() { 
return name; 
} 
public void setname(string name) { 
this.name = name; 
} 
public date getbirth() { 
return birth; 
} 
public void setbirth(date birth) { 
this.birth = birth; 
} 
@override 
public string tostring() { 
return "student [birth=" + birth + ", group=" + group + ", id=" + id 
+ ", name=" + name + "]"; 
} 
}

group.java

package com.company.entity; 
import java.util.list; 
public class group { 
private int id; 
private string name; 
private string position; 
private list<student> students; 
public list<student> getstudents() { 
return students; 
} 
public void setstudents(list<student> students) { 
this.students = students; 
} 
public int getid() { 
return id; 
} 
public void setid(int id) { 
this.id = id; 
} 
public string getname() { 
return name; 
} 
public void setname(string name) { 
this.name = name; 
} 
public string getposition() { 
return position; 
} 
public void setposition(string position) { 
this.position = position; 
} 
@override 
public string tostring() { 
return "group [id=" + id + ", name=" + name + ", position=" + position 
+ "]"; 
} 
}

二、实体对应的表结构

student表:

create table student(
id int primary key,
name varchar(20),
birth date,
group_id int references g_group(g_id));

g_group表:

create table g_group(
g_id int primary key,
g_name varchar(20),
g_position varchar(30));

sequence:

create sequence student_id_sequence;
create sequence group_id_sequence;

三、student和group的映射文件如下，你可以在映射文件中找到，关于mybatis的增删改查操作，mybatis调用存储过程，mybatis分页以及mybatis对一对一、多对多的处理

xml文件中都标有注释，看的时候配合下面的具体实现看，虽然有点乱

student.xml

<?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="com.company.dao.istudentdao"> 
<!-- mybatis缓存 --> 
<cache eviction="lru" flushinterval="600000" size="1024" readonly="false" /> 
<!-- sql标签用来定义一些可以被重用的sql语句或字段或片段等 --> 
<sql id="studentcolumns">select id,name,birth from student</sql> 
<!-- 此处获得多对一的关系 ,但就单条记录而言却是一对一的关系，所以一对一的写法跟此相同--> 
<resultmap type="student" id="getstudentandgroup" > 
<id column="id" property="id"/> 
<result column="name" property="name"/> 
<result column="birth" property="birth"/> 
<association property="group" column="group_id" javatype="group"> 
<id column="g_id" property="id"/> 
<result column="g_name" property="name"/> 
<result column="g_position" property="position"/> 
</association> 
</resultmap> 
<select id="many2one" resultmap="getstudentandgroup" parametertype="int" > 
select s.id,s.name,s.birth,s.group_id,g.g_id,g.g_name,g.g_position 
from student s 
left join g_group g on s.group_id = g.g_id 
where s.id = #{id} 
</select> 
<!-- 意图是获得一个学生，并且获得该学生所属的组，跟上面的意思差不多 ,用association的select属性--> 
<!-- 于上面的相比个人感觉上面的效率要高些，因为上面只有一条sql语句 --> 
<resultmap type="student" id="getstudentandgroupuseselectmap"> 
<id column="id" property="id"/> 
<result column="name" property="name"/> 
<result column="birth" property="birth"/> 
<association property="group" column="group_id" javatype="group" select="selectgroup" /> 
</resultmap> 
<select id="getstudentandgroupuseselect" resultmap="getstudentandgroupuseselectmap" parametertype="int"> 
select * 
from student 
where id = #{id} 
</select> 
<select id="selectgroup" resulttype="group" parametertype="int" flushcache="false" usecache="true"><!-- 此处实用缓存 --> 
select g_id as id, g_name as name, g_position as position 
from g_group 
where g_id = #{id} 
</select> 
<!-- 动态sql语句 的测试dynamic sql--> 
<select id="getstudentbysomecondition" parametertype="student" resulttype="student"> 
select * 
from student 
<where> 
<if test="id != null"> 
id>2 
</if> 
<if test="name != null"> 
and name like '%g%' 
</if> 
</where> 
</select> 
<!-- mybatis调用存储过程 --> 
<resultmap type="student" id="studentmap"> 
<id column="id" property="id"/> 
<result column="name" property="name"/> 
<result column="birth" property="birth"/> 
</resultmap> 
<select id="getalluser" statementtype="callable" > 
{call get_all_student(#{students ,mode=out, jdbctype=cursor, javatype=resultset, resultmap=studentmap} )} 
</select> 
<!-- mybatis向student表中插入一条数据 --> 
<insert id="add" parametertype="student" keycolumn="id"> 
<selectkey keyproperty="id" order="before" resulttype="int"> 
select stu_id_sequence.nextval from dual 
</selectkey> 
insert into student(id,name,birth) values(#{id},#{name},#{birth}) 
</insert> 
<!-- 根据id获得学生的信息 --> 
<select id="getbyid" parametertype="int" resulttype="student"> 
<include refid="studentcolumns"/> where id=#{id} 
</select> 
<!-- 此处的实现方法是一个分页的原型,请查看istudentdaoimpl.java中的调用方法 --> 
<select id="getallstudent" resultmap="studentmap"> 
<include refid="studentcolumns"/> order by id<!--此处是引用了上面预定义好的sql语句--> 
</select> 
</mapper> 

以上所述是小编给大家介绍的mybatis存储过程、mybatis分页、mybatis一对多增删改查操作，希望对大家有所帮助