java学习知识积累-Mybatis中model内置方法细解
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User Model:
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package com.hongyin.model; import java.util.Date; public class User { .... } |
getId返回ID
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public Integer getId() { return id; } |
setId设置ID
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public void setId(Integer id) { this.id = id; } |
UserExample Model:
UserExample 创建一个内部类 Criteria
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public UserExample() { oredCriteria = new ArrayList<Criteria>(); } |
setOrderByClause(“username asc,email desc”); 按字段排序
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public void setOrderByClause(String orderByClause) { this.orderByClause = orderByClause; } |
getOrderByClause 得到成员的排序值
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public String getOrderByClause() { return orderByClause; } |
setDistinct 设置是否返回唯一不同的值
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public void setDistinct(boolean distinct) { this.distinct = distinct; } |
isDistinct 返回成员的是否去重复
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public boolean isDistinct() { return distinct; } |
getOredCriteria 返回Criteria对象
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public List<Criteria> getOredCriteria() { return oredCriteria; } |
or 添加Criteria对象
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public void or(Criteria criteria) { oredCriteria.add(criteria); } |
or 添加Criteria对象，并返回
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public Criteria or() { Criteria criteria = createCriteriaInternal(); oredCriteria.add(criteria); return criteria; } |
createCriteria 创建并判断
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public Criteria createCriteria() { Criteria criteria = createCriteriaInternal(); if (oredCriteria.size() == 0) { oredCriteria.add(criteria); } return criteria; } |
createCriteriaInternal 创建Criteria
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protected Criteria createCriteriaInternal() { Criteria criteria = new Criteria(); return criteria; } |
clear 清除
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public void clear() { oredCriteria.clear(); orderByClause = null; distinct = false; } |
GeneratedCriteria 内嵌的内部类，其已经实现了所有字段的常用过滤条件
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protected abstract static class GeneratedCriteria { ... } |
andIdIsNull 条件为 id is null
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public Criteria andIdIsNull() { addCriterion("id is null"); return (Criteria) this; } |
andIdIsNotNull 条件为 id is not null
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public Criteria andIdIsNotNull() { addCriterion("id is not null"); return (Criteria) this; } |
andIdEqualTo 条件为id=变量值
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public Criteria andIdEqualTo(Integer value) { addCriterion("id =", value, "id"); return (Criteria) this; } |
andIdNotEqualTo 条件为id!=变量值
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public Criteria andIdNotEqualTo(Integer value) { addCriterion("id <>", value, "id"); return (Criteria) this; } |
………..
还有一些常用的。这里就不作多介绍了。
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