Mybatis学习（8）逆向工程

什么是逆向工程：

mybaits需要程序员自己编写sql语句，mybatis官方提供逆向工程 可以针对单表自动生成mybatis执行所需要的代码（mapper.java,mapper.xml、po..）

1）下载逆向工程：

mybatis-generator-core-1.3.2-bundle.zip

2）使用java程序和xml配置生成代码：

其中GeneratorSqlmap.java:

 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;

 import org.mybatis.generator.api.MyBatisGenerator;
 import org.mybatis.generator.config.Configuration;
 import org.mybatis.generator.config.xml.ConfigurationParser;
 import org.mybatis.generator.internal.DefaultShellCallback;

 public class GeneratorSqlmap {

     public void generator() throws Exception{
         List<String> warnings = new ArrayList<String>();
         boolean overwrite = true;
         //指定 逆向工程配置文件
         File configFile = new File("generatorConfig.xml");
         ConfigurationParser cp = new ConfigurationParser(warnings);
         Configuration config = cp.parseConfiguration(configFile);
         DefaultShellCallback callback = new DefaultShellCallback(overwrite);
         MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                 callback, warnings);
         myBatisGenerator.generate(null);
     } 

     public static void main(String[] args) throws Exception {
         try {
             GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
             generatorSqlmap.generator();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }

生成代码配置文件generatorConfig.xml：

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE generatorConfiguration
   PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
   "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

 <generatorConfiguration>
     <context id="testTables" targetRuntime="MyBatis3">
         <commentGenerator>
             <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
             <property name="suppressAllComments" value="true" />
         </commentGenerator>
         <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
         <jdbcConnection driverClass="com.mysql.jdbc.Driver"
             connectionURL="jdbc:mysql://localhost:3306/mybatis" userId="root"
             password="mysql">
         </jdbcConnection>
         <!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver"
             connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg"
             userId="yycg"
             password="yycg">
         </jdbcConnection> -->

         <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
             NUMERIC 类型解析为java.math.BigDecimal -->
         <javaTypeResolver>
             <property name="forceBigDecimals" value="false" />
         </javaTypeResolver>

         <!-- targetProject:生成PO类的位置 -->
         <javaModelGenerator targetPackage="com.ssm.po"
             targetProject=".\src">
             <!-- enableSubPackages:是否让schema作为包的后缀 -->
             <property name="enableSubPackages" value="false" />
             <!-- 从数据库返回的值被清理前后的空格 -->
             <property name="trimStrings" value="true" />
         </javaModelGenerator>
         <!-- targetProject:mapper映射文件生成的位置 -->
         <sqlMapGenerator targetPackage="com.ssm.mapper"
             targetProject=".\src">
             <!-- enableSubPackages:是否让schema作为包的后缀 -->
             <property name="enableSubPackages" value="false" />
         </sqlMapGenerator>
         <!-- targetPackage：mapper接口生成的位置 -->
         <javaClientGenerator type="XMLMAPPER"
             targetPackage="com.ssm.mapper"
             targetProject=".\src">
             <!-- enableSubPackages:是否让schema作为包的后缀 -->
             <property name="enableSubPackages" value="false" />
         </javaClientGenerator>
         <!-- 指定数据库表 -->
         <table tableName="items"></table>
         <table tableName="orders"></table>
         <table tableName="orderdetail"></table>
         <table tableName="user"></table>
         <!-- <table schema="" tableName="sys_user"></table>
         <table schema="" tableName="sys_role"></table>
         <table schema="" tableName="sys_permission"></table>
         <table schema="" tableName="sys_user_role"></table>
         <table schema="" tableName="sys_role_permission"></table> -->

         <!-- 有些表的字段需要指定java类型
          <table schema="" tableName="">
             <columnOverride column="" javaType="" />
         </table> -->
     </context>
 </generatorConfiguration>

执行GeneratorSqlmap.java生成代码：

生成后代码：

3）使用生成的代码：

将生成工程中所生成的代码拷贝到自己的工程中。

举以下的例子：

将ItemsMapper.java/ItemsMapper.xml   Items.java/ItemsExample.java拷贝进项目中；使用这些mapper来做试验：

ItemsMapper.java接口：和ItemsMapper.xml:

 package com.ssm.mapper;

 import com.ssm.po.Items;
 import com.ssm.po.ItemsExample;
 import java.util.List;
 import org.apache.ibatis.annotations.Param;

 public interface ItemsMapper {
     int countByExample(ItemsExample example);

     int deleteByExample(ItemsExample example);

     int deleteByPrimaryKey(Integer id);

     int insert(Items record);

     int insertSelective(Items record);

     List<Items> selectByExampleWithBLOBs(ItemsExample example);

     List<Items> selectByExample(ItemsExample example);

     Items selectByPrimaryKey(Integer id);

     int updateByExampleSelective(@Param("record") Items record, @Param("example") ItemsExample example);

     int updateByExampleWithBLOBs(@Param("record") Items record, @Param("example") ItemsExample example);

     int updateByExample(@Param("record") Items record, @Param("example") ItemsExample example);

     int updateByPrimaryKeySelective(Items record);

     int updateByPrimaryKeyWithBLOBs(Items record);

     int updateByPrimaryKey(Items record);
 }

 <?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.ssm.mapper.ItemsMapper" >
   <resultMap id="BaseResultMap" type="com.ssm.po.Items" >
     <id column="id" property="id" jdbcType="INTEGER" />
     <result column="name" property="name" jdbcType="VARCHAR" />
     <result column="price" property="price" jdbcType="REAL" />
     <result column="pic" property="pic" jdbcType="VARCHAR" />
     <result column="createtime" property="createtime" jdbcType="TIMESTAMP" />
   </resultMap>
   <resultMap id="ResultMapWithBLOBs" type="com.ssm.po.Items" extends="BaseResultMap" >
     <result column="detail" property="detail" jdbcType="LONGVARCHAR" />
   </resultMap>
   <sql id="Example_Where_Clause" >
     <where >
       <foreach collection="oredCriteria" item="criteria" separator="or" >
         <if test="criteria.valid" >
           <trim prefix="(" suffix=")" prefixOverrides="and" >
             <foreach collection="criteria.criteria" item="criterion" >
               <choose >
                 <when test="criterion.noValue" >
                   and ${criterion.condition}
                 </when>
                 <when test="criterion.singleValue" >
                   and ${criterion.condition} #{criterion.value}
                 </when>
                 <when test="criterion.betweenValue" >
                   and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                 </when>
                 <when test="criterion.listValue" >
                   and ${criterion.condition}
                   <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                     #{listItem}
                   </foreach>
                 </when>
               </choose>
             </foreach>
           </trim>
         </if>
       </foreach>
     </where>
   </sql>
   <sql id="Update_By_Example_Where_Clause" >
     <where >
       <foreach collection="example.oredCriteria" item="criteria" separator="or" >
         <if test="criteria.valid" >
           <trim prefix="(" suffix=")" prefixOverrides="and" >
             <foreach collection="criteria.criteria" item="criterion" >
               <choose >
                 <when test="criterion.noValue" >
                   and ${criterion.condition}
                 </when>
                 <when test="criterion.singleValue" >
                   and ${criterion.condition} #{criterion.value}
                 </when>
                 <when test="criterion.betweenValue" >
                   and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                 </when>
                 <when test="criterion.listValue" >
                   and ${criterion.condition}
                   <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                     #{listItem}
                   </foreach>
                 </when>
               </choose>
             </foreach>
           </trim>
         </if>
       </foreach>
     </where>
   </sql>
   <sql id="Base_Column_List" >
     id, name, price, pic, createtime
   </sql>
   <sql id="Blob_Column_List" >
     detail
   </sql>
   <select id="selectByExampleWithBLOBs" resultMap="ResultMapWithBLOBs" parameterType="com.ssm.po.ItemsExample" >
     select
     <if test="distinct" >
       distinct
     </if>
     <include refid="Base_Column_List" />
     ,
     <include refid="Blob_Column_List" />
     from items
     <if test="_parameter != null" >
       <include refid="Example_Where_Clause" />
     </if>
     <if test="orderByClause != null" >
       order by ${orderByClause}
     </if>
   </select>
   <select id="selectByExample" resultMap="BaseResultMap" parameterType="com.ssm.po.ItemsExample" >
     select
     <if test="distinct" >
       distinct
     </if>
     <include refid="Base_Column_List" />
     from items
     <if test="_parameter != null" >
       <include refid="Example_Where_Clause" />
     </if>
     <if test="orderByClause != null" >
       order by ${orderByClause}
     </if>
   </select>
   <select id="selectByPrimaryKey" resultMap="ResultMapWithBLOBs" parameterType="java.lang.Integer" >
     select
     <include refid="Base_Column_List" />
     ,
     <include refid="Blob_Column_List" />
     from items
     where id = #{id,jdbcType=INTEGER}
   </select>
   <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
     delete from items
     where id = #{id,jdbcType=INTEGER}
   </delete>
   <delete id="deleteByExample" parameterType="com.ssm.po.ItemsExample" >
     delete from items
     <if test="_parameter != null" >
       <include refid="Example_Where_Clause" />
     </if>
   </delete>
   <insert id="insert" parameterType="com.ssm.po.Items" >
     insert into items (id, name, price,
       pic, createtime, detail
       )
     values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}, #{price,jdbcType=REAL},
       #{pic,jdbcType=VARCHAR}, #{createtime,jdbcType=TIMESTAMP}, #{detail,jdbcType=LONGVARCHAR}
       )
   </insert>
   <insert id="insertSelective" parameterType="com.ssm.po.Items" >
     insert into items
     <trim prefix="(" suffix=")" suffixOverrides="," >
       <if test="id != null" >
         id,
       </if>
       <if test="name != null" >
         name,
       </if>
       <if test="price != null" >
         price,
       </if>
       <if test="pic != null" >
         pic,
       </if>
       <if test="createtime != null" >
         createtime,
       </if>
       <if test="detail != null" >
         detail,
       </if>
     </trim>
     <trim prefix="values (" suffix=")" suffixOverrides="," >
       <if test="id != null" >
         #{id,jdbcType=INTEGER},
       </if>
       <if test="name != null" >
         #{name,jdbcType=VARCHAR},
       </if>
       <if test="price != null" >
         #{price,jdbcType=REAL},
       </if>
       <if test="pic != null" >
         #{pic,jdbcType=VARCHAR},
       </if>
       <if test="createtime != null" >
         #{createtime,jdbcType=TIMESTAMP},
       </if>
       <if test="detail != null" >
         #{detail,jdbcType=LONGVARCHAR},
       </if>
     </trim>
   </insert>
   <select id="countByExample" parameterType="com.ssm.po.ItemsExample" resultType="java.lang.Integer" >
     select count(*) from items
     <if test="_parameter != null" >
       <include refid="Example_Where_Clause" />
     </if>
   </select>
   <update id="updateByExampleSelective" parameterType="map" >
     update items
     <set >
       <if test="record.id != null" >
         id = #{record.id,jdbcType=INTEGER},
       </if>
       <if test="record.name != null" >
         name = #{record.name,jdbcType=VARCHAR},
       </if>
       <if test="record.price != null" >
         price = #{record.price,jdbcType=REAL},
       </if>
       <if test="record.pic != null" >
         pic = #{record.pic,jdbcType=VARCHAR},
       </if>
       <if test="record.createtime != null" >
         createtime = #{record.createtime,jdbcType=TIMESTAMP},
       </if>
       <if test="record.detail != null" >
         detail = #{record.detail,jdbcType=LONGVARCHAR},
       </if>
     </set>
     <if test="_parameter != null" >
       <include refid="Update_By_Example_Where_Clause" />
     </if>
   </update>
   <update id="updateByExampleWithBLOBs" parameterType="map" >
     update items
     set id = #{record.id,jdbcType=INTEGER},
       name = #{record.name,jdbcType=VARCHAR},
       price = #{record.price,jdbcType=REAL},
       pic = #{record.pic,jdbcType=VARCHAR},
       createtime = #{record.createtime,jdbcType=TIMESTAMP},
       detail = #{record.detail,jdbcType=LONGVARCHAR}
     <if test="_parameter != null" >
       <include refid="Update_By_Example_Where_Clause" />
     </if>
   </update>
   <update id="updateByExample" parameterType="map" >
     update items
     set id = #{record.id,jdbcType=INTEGER},
       name = #{record.name,jdbcType=VARCHAR},
       price = #{record.price,jdbcType=REAL},
       pic = #{record.pic,jdbcType=VARCHAR},
       createtime = #{record.createtime,jdbcType=TIMESTAMP}
     <if test="_parameter != null" >
       <include refid="Update_By_Example_Where_Clause" />
     </if>
   </update>
   <update id="updateByPrimaryKeySelective" parameterType="com.ssm.po.Items" >
     update items
     <set >
       <if test="name != null" >
         name = #{name,jdbcType=VARCHAR},
       </if>
       <if test="price != null" >
         price = #{price,jdbcType=REAL},
       </if>
       <if test="pic != null" >
         pic = #{pic,jdbcType=VARCHAR},
       </if>
       <if test="createtime != null" >
         createtime = #{createtime,jdbcType=TIMESTAMP},
       </if>
       <if test="detail != null" >
         detail = #{detail,jdbcType=LONGVARCHAR},
       </if>
     </set>
     where id = #{id,jdbcType=INTEGER}
   </update>
   <update id="updateByPrimaryKeyWithBLOBs" parameterType="com.ssm.po.Items" >
     update items
     set name = #{name,jdbcType=VARCHAR},
       price = #{price,jdbcType=REAL},
       pic = #{pic,jdbcType=VARCHAR},
       createtime = #{createtime,jdbcType=TIMESTAMP},
       detail = #{detail,jdbcType=LONGVARCHAR}
     where id = #{id,jdbcType=INTEGER}
   </update>
   <update id="updateByPrimaryKey" parameterType="com.ssm.po.Items" >
     update items
     set name = #{name,jdbcType=VARCHAR},
       price = #{price,jdbcType=REAL},
       pic = #{pic,jdbcType=VARCHAR},
       createtime = #{createtime,jdbcType=TIMESTAMP}
     where id = #{id,jdbcType=INTEGER}
   </update>
 </mapper>

Items.java 和 ItemsExample.java:

 package com.ssm.po;

 import java.util.Date;

 public class Items {
     private Integer id;

     private String name;

     private Float price;

     private String pic;

     private Date createtime;

     private String detail;

     public Integer getId() {
         return id;
     }

     public void setId(Integer id) {
         this.id = id;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name == null ? null : name.trim();
     }

     public Float getPrice() {
         return price;
     }

     public void setPrice(Float price) {
         this.price = price;
     }

     public String getPic() {
         return pic;
     }

     public void setPic(String pic) {
         this.pic = pic == null ? null : pic.trim();
     }

     public Date getCreatetime() {
         return createtime;
     }

     public void setCreatetime(Date createtime) {
         this.createtime = createtime;
     }

     public String getDetail() {
         return detail;
     }

     public void setDetail(String detail) {
         this.detail = detail == null ? null : detail.trim();
     }
 }

 package com.ssm.po;

 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;

 public class ItemsExample {
     protected String orderByClause;

     protected boolean distinct;

     protected List<Criteria> oredCriteria;

     public ItemsExample() {
         oredCriteria = new ArrayList<Criteria>();
     }

     public void setOrderByClause(String orderByClause) {
         this.orderByClause = orderByClause;
     }

     public String getOrderByClause() {
         return orderByClause;
     }

     public void setDistinct(boolean distinct) {
         this.distinct = distinct;
     }

     public boolean isDistinct() {
         return distinct;
     }

     public List<Criteria> getOredCriteria() {
         return oredCriteria;
     }

     public void or(Criteria criteria) {
         oredCriteria.add(criteria);
     }

     public Criteria or() {
         Criteria criteria = createCriteriaInternal();
         oredCriteria.add(criteria);
         return criteria;
     }

     public Criteria createCriteria() {
         Criteria criteria = createCriteriaInternal();
         if (oredCriteria.size() == 0) {
             oredCriteria.add(criteria);
         }
         return criteria;
     }

     protected Criteria createCriteriaInternal() {
         Criteria criteria = new Criteria();
         return criteria;
     }

     public void clear() {
         oredCriteria.clear();
         orderByClause = null;
         distinct = false;
     }

     protected abstract static class GeneratedCriteria {
         protected List<Criterion> criteria;

         protected GeneratedCriteria() {
             super();
             criteria = new ArrayList<Criterion>();
         }

         public boolean isValid() {
             return criteria.size() > 0;
         }

         public List<Criterion> getAllCriteria() {
             return criteria;
         }

         public List<Criterion> getCriteria() {
             return criteria;
         }

         protected void addCriterion(String condition) {
             if (condition == null) {
                 throw new RuntimeException("Value for condition cannot be null");
             }
             criteria.add(new Criterion(condition));
         }

         protected void addCriterion(String condition, Object value, String property) {
             if (value == null) {
                 throw new RuntimeException("Value for " + property + " cannot be null");
             }
             criteria.add(new Criterion(condition, value));
         }

         protected void addCriterion(String condition, Object value1, Object value2, String property) {
             if (value1 == null || value2 == null) {
                 throw new RuntimeException("Between values for " + property + " cannot be null");
             }
             criteria.add(new Criterion(condition, value1, value2));
         }

         public Criteria andIdIsNull() {
             addCriterion("id is null");
             return (Criteria) this;
         }

         public Criteria andIdIsNotNull() {
             addCriterion("id is not null");
             return (Criteria) this;
         }

         public Criteria andIdEqualTo(Integer value) {
             addCriterion("id =", value, "id");
             return (Criteria) this;
         }

         public Criteria andIdNotEqualTo(Integer value) {
             addCriterion("id <>", value, "id");
             return (Criteria) this;
         }

         public Criteria andIdGreaterThan(Integer value) {
             addCriterion("id >", value, "id");
             return (Criteria) this;
         }

         public Criteria andIdGreaterThanOrEqualTo(Integer value) {
             addCriterion("id >=", value, "id");
             return (Criteria) this;
         }

         public Criteria andIdLessThan(Integer value) {
             addCriterion("id <", value, "id");
             return (Criteria) this;
         }

         public Criteria andIdLessThanOrEqualTo(Integer value) {
             addCriterion("id <=", value, "id");
             return (Criteria) this;
         }

         public Criteria andIdIn(List<Integer> values) {
             addCriterion("id in", values, "id");
             return (Criteria) this;
         }

         public Criteria andIdNotIn(List<Integer> values) {
             addCriterion("id not in", values, "id");
             return (Criteria) this;
         }

         public Criteria andIdBetween(Integer value1, Integer value2) {
             addCriterion("id between", value1, value2, "id");
             return (Criteria) this;
         }

         public Criteria andIdNotBetween(Integer value1, Integer value2) {
             addCriterion("id not between", value1, value2, "id");
             return (Criteria) this;
         }

         public Criteria andNameIsNull() {
             addCriterion("name is null");
             return (Criteria) this;
         }

         public Criteria andNameIsNotNull() {
             addCriterion("name is not null");
             return (Criteria) this;
         }

         public Criteria andNameEqualTo(String value) {
             addCriterion("name =", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameNotEqualTo(String value) {
             addCriterion("name <>", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameGreaterThan(String value) {
             addCriterion("name >", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameGreaterThanOrEqualTo(String value) {
             addCriterion("name >=", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameLessThan(String value) {
             addCriterion("name <", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameLessThanOrEqualTo(String value) {
             addCriterion("name <=", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameLike(String value) {
             addCriterion("name like", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameNotLike(String value) {
             addCriterion("name not like", value, "name");
             return (Criteria) this;
         }

         public Criteria andNameIn(List<String> values) {
             addCriterion("name in", values, "name");
             return (Criteria) this;
         }

         public Criteria andNameNotIn(List<String> values) {
             addCriterion("name not in", values, "name");
             return (Criteria) this;
         }

         public Criteria andNameBetween(String value1, String value2) {
             addCriterion("name between", value1, value2, "name");
             return (Criteria) this;
         }

         public Criteria andNameNotBetween(String value1, String value2) {
             addCriterion("name not between", value1, value2, "name");
             return (Criteria) this;
         }

         public Criteria andPriceIsNull() {
             addCriterion("price is null");
             return (Criteria) this;
         }

         public Criteria andPriceIsNotNull() {
             addCriterion("price is not null");
             return (Criteria) this;
         }

         public Criteria andPriceEqualTo(Float value) {
             addCriterion("price =", value, "price");
             return (Criteria) this;
         }

         public Criteria andPriceNotEqualTo(Float value) {
             addCriterion("price <>", value, "price");
             return (Criteria) this;
         }

         public Criteria andPriceGreaterThan(Float value) {
             addCriterion("price >", value, "price");
             return (Criteria) this;
         }

         public Criteria andPriceGreaterThanOrEqualTo(Float value) {
             addCriterion("price >=", value, "price");
             return (Criteria) this;
         }

         public Criteria andPriceLessThan(Float value) {
             addCriterion("price <", value, "price");
             return (Criteria) this;
         }

         public Criteria andPriceLessThanOrEqualTo(Float value) {
             addCriterion("price <=", value, "price");
             return (Criteria) this;
         }

         public Criteria andPriceIn(List<Float> values) {
             addCriterion("price in", values, "price");
             return (Criteria) this;
         }

         public Criteria andPriceNotIn(List<Float> values) {
             addCriterion("price not in", values, "price");
             return (Criteria) this;
         }

         public Criteria andPriceBetween(Float value1, Float value2) {
             addCriterion("price between", value1, value2, "price");
             return (Criteria) this;
         }

         public Criteria andPriceNotBetween(Float value1, Float value2) {
             addCriterion("price not between", value1, value2, "price");
             return (Criteria) this;
         }

         public Criteria andPicIsNull() {
             addCriterion("pic is null");
             return (Criteria) this;
         }

         public Criteria andPicIsNotNull() {
             addCriterion("pic is not null");
             return (Criteria) this;
         }

         public Criteria andPicEqualTo(String value) {
             addCriterion("pic =", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicNotEqualTo(String value) {
             addCriterion("pic <>", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicGreaterThan(String value) {
             addCriterion("pic >", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicGreaterThanOrEqualTo(String value) {
             addCriterion("pic >=", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicLessThan(String value) {
             addCriterion("pic <", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicLessThanOrEqualTo(String value) {
             addCriterion("pic <=", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicLike(String value) {
             addCriterion("pic like", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicNotLike(String value) {
             addCriterion("pic not like", value, "pic");
             return (Criteria) this;
         }

         public Criteria andPicIn(List<String> values) {
             addCriterion("pic in", values, "pic");
             return (Criteria) this;
         }

         public Criteria andPicNotIn(List<String> values) {
             addCriterion("pic not in", values, "pic");
             return (Criteria) this;
         }

         public Criteria andPicBetween(String value1, String value2) {
             addCriterion("pic between", value1, value2, "pic");
             return (Criteria) this;
         }

         public Criteria andPicNotBetween(String value1, String value2) {
             addCriterion("pic not between", value1, value2, "pic");
             return (Criteria) this;
         }

         public Criteria andCreatetimeIsNull() {
             addCriterion("createtime is null");
             return (Criteria) this;
         }

         public Criteria andCreatetimeIsNotNull() {
             addCriterion("createtime is not null");
             return (Criteria) this;
         }

         public Criteria andCreatetimeEqualTo(Date value) {
             addCriterion("createtime =", value, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeNotEqualTo(Date value) {
             addCriterion("createtime <>", value, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeGreaterThan(Date value) {
             addCriterion("createtime >", value, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeGreaterThanOrEqualTo(Date value) {
             addCriterion("createtime >=", value, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeLessThan(Date value) {
             addCriterion("createtime <", value, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeLessThanOrEqualTo(Date value) {
             addCriterion("createtime <=", value, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeIn(List<Date> values) {
             addCriterion("createtime in", values, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeNotIn(List<Date> values) {
             addCriterion("createtime not in", values, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeBetween(Date value1, Date value2) {
             addCriterion("createtime between", value1, value2, "createtime");
             return (Criteria) this;
         }

         public Criteria andCreatetimeNotBetween(Date value1, Date value2) {
             addCriterion("createtime not between", value1, value2, "createtime");
             return (Criteria) this;
         }
     }

     public static class Criteria extends GeneratedCriteria {

         protected Criteria() {
             super();
         }
     }

     public static class Criterion {
         private String condition;

         private Object value;

         private Object secondValue;

         private boolean noValue;

         private boolean singleValue;

         private boolean betweenValue;

         private boolean listValue;

         private String typeHandler;

         public String getCondition() {
             return condition;
         }

         public Object getValue() {
             return value;
         }

         public Object getSecondValue() {
             return secondValue;
         }

         public boolean isNoValue() {
             return noValue;
         }

         public boolean isSingleValue() {
             return singleValue;
         }

         public boolean isBetweenValue() {
             return betweenValue;
         }

         public boolean isListValue() {
             return listValue;
         }

         public String getTypeHandler() {
             return typeHandler;
         }

         protected Criterion(String condition) {
             super();
             this.condition = condition;
             this.typeHandler = null;
             this.noValue = true;
         }

         protected Criterion(String condition, Object value, String typeHandler) {
             super();
             this.condition = condition;
             this.value = value;
             this.typeHandler = typeHandler;
             if (value instanceof List<?>) {
                 this.listValue = true;
             } else {
                 this.singleValue = true;
             }
         }

         protected Criterion(String condition, Object value) {
             this(condition, value, null);
         }

         protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
             super();
             this.condition = condition;
             this.value = value;
             this.secondValue = secondValue;
             this.typeHandler = typeHandler;
             this.betweenValue = true;
         }

         protected Criterion(String condition, Object value, Object secondValue) {
             this(condition, value, secondValue, null);
         }
     }
 }

4）测试ItemsMapper中的方法：

 package com.ssm.mapper;

 import static org.junit.Assert.*;
 import java.util.Date;
 import java.util.List;
 import org.junit.Before;
 import org.junit.Test;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 import com.ssm.po.Items;
 import com.ssm.po.ItemsExample;

 public class ItemsMapperTest {

     private ApplicationContext applicationContext;
     private ItemsMapper itemsMapper;

     @Before
     public void setUp() throws Exception {
         applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
         itemsMapper = (ItemsMapper) applicationContext.getBean("itemsMapper");
     }

     //根据主键删除
     @Test
     public void testDeleteByPrimaryKey() {
         fail("Not yet implemented");
     }

     //插入
     @Test
     public void testInsert() {
         //构造 items对象
         Items items = new Items();
         items.setName("手机");
         items.setPrice(999f);
         items.setCreatetime(new Date());
         itemsMapper.insert(items);
     }

     //自定义条件查询
     @Test
     public void testSelectByExample() {
         ItemsExample itemsExample = new ItemsExample();
         //通过criteria构造查询条件
         ItemsExample.Criteria criteria = itemsExample.createCriteria();
         criteria.andNameEqualTo("手机");
         //可能返回多条记录
         List<Items> list = itemsMapper.selectByExample(itemsExample);
         System.out.println(list);
     }

     //根据主键查询
     @Test
     public void testSelectByPrimaryKey() {
         Items items = itemsMapper.selectByPrimaryKey(1);
         System.out.println(items);
     }

     //更新数据
     @Test
     public void testUpdateByPrimaryKey() {
         //对所有字段进行更新，需要先查询出来再更新
         Items items = itemsMapper.selectByPrimaryKey(4);
         items.setName("水杯");
         itemsMapper.updateByPrimaryKey(items);

         //如果传入字段不空为才更新，在批量更新中使用此方法，不需要先查询再更新
         //itemsMapper.updateByPrimaryKeySelective(record);
     }
 }

主要是看下逆向工程生成的mapper接口、mapper.xml配置文件；