Spring, Mybatis, Mysql realize paging through stored procedures--Mybatis implementation

Can the paging function of Mybatis help to implement the query dynamically through the stored procedure in the database?

Spring, Mybatis, Mysql realizes paging through stored procedures. There are three parts to the blog.
The first part: the stored procedure implementation
of stored procedure dynamic paging. The second part: the Mybatis implementation of stored procedure dynamic paging. The third part: the
actual project demo of stored procedure dynamic paging.

This article is about the
second part: Mybatis implementation of dynamic paging of stored procedures Mybatis implements


paging for any query by calling dynamic_paging stored procedures.


Mybatis can call stored procedures. For example, in Mybatis' mapper file:

<select id="get***" resultMap="**Map"
		parameterMap="procMap" statementType="CALLABLE">
        CALL proc(?,?)
</select>
<parameterMap type="java.util.Map" id="procMap">
		<parameter property="param1" mode="IN" jdbcType="INTEGER" />
		<parameter property="param1" mode="IN" jdbcType="INTEGER" />
	</parameterMap>

Paginated stored procedure

CREATE PROCEDURE `dynamic_paging`(sql varchar(500),page_begin int,size int)

The problem is that the first parameter (sql) of the dynamic_paging stored procedure needs to be dynamically generated before the call.
E.g:

select * from tableA,tableB where tableA.id=tableB.uid and id=10 

The sql when Mybatis calls is:

select * from tableA,tableB where tableA.id=tableB.uid and id= ?

id=10 This is passed in by the program. It is a specific business data.

And this part is the first parameter of calling dynamic_paging.

The specific solution is: MyBatis Velocity, link http://www.mybatis.org/velocity-scripting/index.html



to dynamically fill the business logic value in the configuration file, and then pass it to the stored procedure


for example:

<select id="get***"  resultMap="***Map"
		parameterMap="procMap" statementType="CALLABLE" lang="velocity" >

		#set( $sql = 'select * from tableA,tableB where tableA.id=tableB.uid and id='+$_parameter.id )
		#set( $begin=$_parameter.pageBegin)
		#set( $size=$_parameter.fetchSize)
		CALL dynamic_paging(@{sql},@{begin},@{size})
</select>

<parameterMap type="java.util.Map" id="procMap">
                <parameter property="id" />
		<parameter property="pageBegin" />
		<parameter property="fetchSize"/>
</parameterMap>