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<?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.ruili.wcp.dao.management.MenuMapper">
 
    <!-- 获取最大排序号 -->
    <select id="selectMaxSortNum" resultType="int">
        select ifnull(max(sort_num), 0) sortNum
        FROM sys_menu
    </select>
    <!-- 获取最大排序号 -->
    <select id="selectMaxSortNum" resultType="int" databaseId="kingbasees">
        select NVL(max(sort_num), 0) sortNum
        FROM sys_menu
    </select>
    <!-- 获取最大排序号 -->
    <select id="selectMaxSortNum" resultType="int" databaseId="xugu">
        select NVL(max(sort_num), 0) sortNum
        FROM sys_menu
    </select>
    <!-- 获取最大排序号 -->
    <select id="selectMaxSortNum" resultType="int" databaseId="oracle">
        select NVL(max(sort_num), 0) sortNum
        FROM sys_menu
    </select>
    <!-- 获取最大排序号 -->
    <select id="selectMaxSortNum" resultType="int" databaseId="sqlServer">
        select isnull(max(sort_num), 0) sortNum
        FROM sys_menu
    </select>
</mapper>