com.baomidou.mybatisplus.core.conditions.query

类 LambdaQueryWrapper<T>

java.lang.Object

com.baomidou.mybatisplus.core.conditions.Wrapper<T>

com.baomidou.mybatisplus.core.conditions.AbstractWrapper<T,Property<T,?>,This>

com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper<T,LambdaQueryWrapper<T>>

com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper<T>

所有已实现的接口:

Compare<LambdaQueryWrapper<T>,Property<T,?>>, Func<LambdaQueryWrapper<T>,Property<T,?>>, Join<LambdaQueryWrapper<T>>, Nested<LambdaQueryWrapper<T>>, ISqlSegment, java.io.Serializable

public class LambdaQueryWrapper<T>
extends AbstractLambdaWrapper<T,LambdaQueryWrapper<T>>

Lambda 语法使用 Wrapper

从以下版本开始:

2017-05-26

作者:

hubin miemie HCL

另请参阅:

序列化表格

字段概要

从类继承的字段 com.baomidou.mybatisplus.core.conditions.AbstractWrapper

entity, entityClass, expression, lastSql, paramAlias, paramNameSeq, paramNameValuePairs, typedThis

构造器概要

构造器

构造器和说明
LambdaQueryWrapper()
LambdaQueryWrapper(T entity)

方法概要

限定符和类型	方法和说明
java.lang.String	getSqlSelect() 查询条件 SQL 片段（子类实现）
protected LambdaQueryWrapper<T>	instance(java.util.concurrent.atomic.AtomicInteger paramNameSeq, java.util.Map<java.lang.String,java.lang.Object> paramNameValuePairs) 用于生成嵌套 sql 故 sqlSelect 不向下传递
LambdaQueryWrapper<T>	select(java.lang.Class<T> entityClass, java.util.function.Predicate<TableFieldInfo> predicate) 过滤查询的字段信息(主键除外!)
LambdaQueryWrapper<T>	select(java.util.function.Predicate<TableFieldInfo> predicate)
LambdaQueryWrapper<T>	select(Property<T,?>... columns) SELECT 部分 SQL 设置

从类继承的方法 com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper

columnToString

从类继承的方法 com.baomidou.mybatisplus.core.conditions.AbstractWrapper

addCondition, addNestedCondition, allEq, allEq, and, and, apply, between, clone, columnsToString, doIt, eq, exists, formatSql, formatSqlIfNeed, ge, getCheckEntityClass, getEntity, getExpression, getParamAlias, getParamNameValuePairs, getSqlSegment, groupBy, gt, having, in, initEntityClass, initNeed, inSql, isNotNull, isNull, last, le, like, likeLeft, likeRight, lt, ne, nested, not, notBetween, notExists, notIn, notInSql, notLike, or, or, orderBy, setEntity

从类继承的方法 com.baomidou.mybatisplus.core.conditions.Wrapper

getSqlSet, isEmptyOfWhere, notEmptyOfWhere

从类继承的方法 java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 com.baomidou.mybatisplus.core.conditions.interfaces.Compare

allEq, allEq, allEq, allEq, between, eq, ge, gt, le, like, likeLeft, likeRight, lt, ne, notBetween, notLike

从接口继承的方法 com.baomidou.mybatisplus.core.conditions.interfaces.Nested

and, nested, or

从接口继承的方法 com.baomidou.mybatisplus.core.conditions.interfaces.Join

apply, exists, last, notExists, or

从接口继承的方法 com.baomidou.mybatisplus.core.conditions.interfaces.Func

groupBy, having, in, in, in, inSql, isNotNull, isNull, notIn, notIn, notIn, notInSql, orderByAsc, orderByAsc, orderByDesc, orderByDesc

构造器详细资料

LambdaQueryWrapper

public LambdaQueryWrapper()

LambdaQueryWrapper

public LambdaQueryWrapper(T entity)

方法详细资料

select

@SafeVarargs
public final LambdaQueryWrapper<T> select(Property<T,?>... columns)

SELECT 部分 SQL 设置

参数:

columns - 查询字段

select

public LambdaQueryWrapper<T> select(java.util.function.Predicate<TableFieldInfo> predicate)

select

public LambdaQueryWrapper<T> select(java.lang.Class<T> entityClass,
                                    java.util.function.Predicate<TableFieldInfo> predicate)

过滤查询的字段信息(主键除外!)

例1: 只要 java 字段名以 "test" 开头的 -> select(i -> i.getProperty().startsWith("test")) 例2: 只要 java 字段属性是 CharSequence 类型的 -> select(TableFieldInfo::isCharSequence) 例3: 只要 java 字段没有填充策略的 -> select(i -> i.getFieldFill == FieldFill.DEFAULT) 例4: 要全部字段 -> select(i -> true) 例5: 只要主键字段 -> select(i -> false)

参数:

predicate - 过滤方式

返回:

this

getSqlSelect

public java.lang.String getSqlSelect()

从类复制的说明: Wrapper

查询条件 SQL 片段（子类实现）

覆盖:

getSqlSelect 在类中 Wrapper<T>

instance

protected LambdaQueryWrapper<T> instance(java.util.concurrent.atomic.AtomicInteger paramNameSeq,
                                         java.util.Map<java.lang.String,java.lang.Object> paramNameValuePairs)

用于生成嵌套 sql 故 sqlSelect 不向下传递

指定者:

instance 在类中 AbstractWrapper<T,Property<T,?>,LambdaQueryWrapper<T>>