改造iBatis，使其支持自动生成sql语句(2)

改造iBatis，使其支持自动生成sql语句(2)

　　上篇讲到基本思路和代码修改的切入点。这篇继续讲实现的细节的demo。

　　在生成iql语句时，generate前面和后面的iql语句给予保留，充分保留最大的灵活性。

　　在生成iql语句时候后，在调用insert和update时，转入的parametarObject必须是parametermap规定的Object，在select和delete时，如果parameter只有1个，则会把iql变量替换成#value#。

 sql-map 代码

<!---->xml version="1.0" encoding="UTF-8"?>
<!---->
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="sort">
  <typeAlias alias="Sort" type="com.cpcw.product.domain.Sort"/>

  <parameterMap id="SortParameterMap" class="Sort">
    <parameter property="name" column="name" jdbcType="VC"/>
    <parameter property="fid" column="fid" jdbcType="INTEGER"/>
    <parameter property="status" column="status" jdbcType="INTEGER"/>
    <parameter property="notes" column="notes" jdbcType="VC"/>
    <parameter property="created" column="created" jdbcType="TIMESTAMP"/>
  parameterMap>

  <parameterMap id="SortParameterFulMap" class="Sort" extends="SortParameterMap">
    <parameter property="id" column="id" jdbcType="INTEGER"/>

  parameterMap>

  <parameterMap id="SortParameterDeleteMap" class="Sort">
    <parameter property="id" column="id"/>
  parameterMap>

  <select id="selectSort" parameterMap="sort.SortParameterFulMap" resultClass="Sort">
    select * from (
    <generate table="sort" where="id"/>
    ) a order by id desc limit 1
  select>

  <insert id="createSort" parameterMap="sort.SortParameterMap">
    <selectKey keyProperty="id" resultClass="int" type="post">
      select last_insert_id() as value
    selectKey>
    <generate table="sort"/>
  insert>
  <update id="updateSort" parameterMap="sort.SortParameterFulMap">
    <generate where="id" table="sort" excludes="{status,created}"/>
  update>

  <delete id="deleteSort" parameterMap="sort.SortParameterDeleteMap">
    <generate table="sort" where="id"/>
  delete>


sqlMap>

 

java 代码

public Sort getSortById(int id) {
  return (Sort) queryForObject("sort.selectSort", new Integer(id));
}

public int createSort(Sort sort) {
  insert("sort.createSort", sort);
  return sort.getId();
}

public int updateSort(Sort sort) {
  return update("sort.updateSort", sort);
}

public int deleteSort(int id) {
  return delete("sort.deleteSort", new Integer(id));
}

 

生成的IQL 代码

  select:

  select * from (
    select name as name, fid as fid, status as status, notes as notes, created as created, id as id from sort where id = #value#
    ) a order by id desc limit 1

inesrt:
    insert into sort (name, fid, status, notes, created) values (#name:VC#, #fid:INTEGER#, #status:INTEGER#, #notes:VC#, #created:TIMESTAMP#)

update:
    update sort set name = #name:VC#, fid = #fid:INTEGER#, notes = #notes:VC#, id = #id:INTEGER# where id = #id:INTEGER#
delete
    delete from sort where id = #value#

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