Mybatis分页参数RowBounds

Mybatis分页参数RowBounds

RowBounds源码

package org.apache.ibatis.session;

public class RowBounds {
    public static final int NO_ROW_OFFSET =0;
    public static final int NO_ROW_LIMIT = Integer.MAX_VALUE;
    public static final RowBounds DEFAULT = new RowBounds();
    
    private int offset;
    private int limit;
    
    public RowBounds()
    {
        this.offset = NO_ROW_OFFSET;
        this.limit = NO_ROW_LIMIT;
    }

    public RowBounds(int offset, int limit)
    {
        this.offset = offset;
        this.limit = limit;
    }

    public int getOffset() {
        return offset;
    }

    public void setOffset(int offset) {
        this.offset = offset;
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        this.limit = limit;
    }

    public static int getNoRowOffset() {
        return NO_ROW_OFFSET;
    }

    public static int getNoRowLimit() {
        return NO_ROW_LIMIT;
    }

    public static RowBounds getDefault() {
        return DEFAULT;
    }   
}

offset属性是偏移量，即从第几行开始读取记录。limit是限制条数，从源码可知，默认值为0和Java的最大整数

使用时，仅需要给接口增加一个RowBounds参数

public List findByRowBounds(@Param("roleName") String rolename, @Param("note") String note, RowBounds rowBounds);

映射内容测试接口

            select id, role_name as roleName, note from t_role where role_name like contact('%',#{roleName},'%')
            and note like concat('%',#{note},'%')

    

测试RowBounds内容

package com.learn.ssm.chapter3.main;

import java.io.IOException;
import java.util.List;

import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;

import com.learn.ssm.chapter3.mapper.RoleMapper;
import com.learn.ssm.chapter3.pojo.Role;
import com.learn.ssm.chapter3.utils.SqlSessionFactoryUtils;

public class Chapter5Main {
    
    public static void main(String[] args) throws IOException
    {
        SqlSession sqlSession = null;
        
        sqlSession = SqlSessionFactoryUtils.getSession();
        RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
        RowBounds rowBounds = new RowBounds(0,20);
        List roleList = roleMapper.findByRowBounds("role_name","note",rowBounds);
        System.err.println(roleList.size());
    }   
}