程序包 com.baomidou.mybatisplus.core.conditions.query

类 QueryWrapper<T>

java.lang.Object

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

com.baomidou.mybatisplus.core.conditions.AbstractWrapper<T,String,QueryWrapper<T>>

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

所有已实现的接口:

Compare<QueryWrapper<T>,String>, Func<QueryWrapper<T>,String>, Join<QueryWrapper<T>>, Nested<QueryWrapper<T>,QueryWrapper<T>>, ISqlSegment, Query<QueryWrapper<T>,T,String>, Serializable

public class QueryWrapper<T>
extends AbstractWrapper<T,String,QueryWrapper<T>>
implements Query<QueryWrapper<T>,T,String>

Entity 对象封装操作类

从以下版本开始:

2018-05-25

作者:

hubin miemie HCL

另请参阅:

• 序列化表格

嵌套类概要

从类继承的嵌套类/接口 com.baomidou.mybatisplus.core.conditions.AbstractWrapper

AbstractWrapper.DoSomething

字段概要

字段

修饰符和类型	字段	说明
protected final SharedString	sqlSelect	查询字段

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

expression, lastSql, paramAlias, paramNameSeq, paramNameValuePairs, sqlComment, sqlFirst, typedThis

构造器概要

构造器

构造器	说明
QueryWrapper()
QueryWrapper(Class<T> entityClass)
QueryWrapper(T entity)
QueryWrapper(T entity, String... columns)

方法概要

修饰符和类型	方法	说明
QueryWrapper<T>	checkSqlInjection()	开启检查 SQL 注入
void	clear()	条件清空
protected String	columnToString(String column)	获取 columnName
String	getSqlSelect()	查询条件 SQL 片段
protected QueryWrapper<T>	instance()	用于生成嵌套 sql
LambdaQueryWrapper<T>	lambda()	返回一个支持 lambda 函数写法的 wrapper
QueryWrapper<T>	select(boolean condition, List<String> columns)	指定查询字段
QueryWrapper<T>	select(Class<T> entityClass, Predicate<TableFieldInfo> predicate)	过滤查询的字段信息(主键除外!)

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

addCondition, addNestedCondition, allEq, allEq, and, and, appendSqlSegments, apply, between, clone, columnsToString, columnsToString, columnToSqlSegment, comment, doGroupBy, doOrderBy, eq, eqSql, exists, first, formatParam, formatSqlMaybeWithParam, func, ge, geSql, getEntity, getEntityClass, getExpression, getParamAlias, getParamNameValuePairs, getSqlComment, getSqlFirst, getSqlSegment, groupBy, groupBy, groupBy, groupBy, gt, gtSql, having, in, in, inExpression, inExpression, initNeed, inSql, isNotNull, isNull, isUseAnnotationOrderBy, last, le, leSql, like, likeLeft, likeRight, likeValue, lt, ltSql, maybeDo, ne, nested, not, not, notBetween, notExists, notIn, notIn, notInSql, notLike, notLikeLeft, notLikeRight, or, or, orderBy, orderBy, orderBy, orderBy, setEntity, setEntityClass, setParamAlias

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

getCustomSqlSegment, getSqlSet, getTargetSql, isEmptyOfEntity, isEmptyOfNormal, isEmptyOfWhere, isNonEmptyOfEntity, isNonEmptyOfNormal, isNonEmptyOfWhere, nonEmptyOfEntity, nonEmptyOfNormal, nonEmptyOfWhere

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, notLikeLeft, notLikeRight

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

eqSql, func, geSql, groupBy, groupBy, groupBy, gtSql, having, in, in, inSql, isNotNull, isNull, leSql, ltSql, notIn, notIn, notInSql, orderByAsc, orderByAsc, orderByAsc, orderByAsc, orderByAsc, orderByAsc, orderByAsc, orderByDesc, orderByDesc, orderByDesc, orderByDesc, orderByDesc, orderByDesc, orderByDesc

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

apply, comment, exists, first, last, notExists, or

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

and, nested, not, or

从接口继承的方法 com.baomidou.mybatisplus.core.conditions.query.Query

select, select, select, select

字段详细资料

sqlSelect

protected final SharedString sqlSelect

查询字段

构造器详细资料

QueryWrapper

public QueryWrapper()

QueryWrapper

public QueryWrapper(T entity)

QueryWrapper

public QueryWrapper(Class<T> entityClass)

QueryWrapper

public QueryWrapper(T entity,
 String... columns)

方法详细资料

checkSqlInjection

public QueryWrapper<T> checkSqlInjection()

开启检查 SQL 注入

columnToString

protected String columnToString(String column)

从类复制的说明: AbstractWrapper

获取 columnName

覆盖:

columnToString 在类中 AbstractWrapper<T,String,QueryWrapper<T>>

select

public QueryWrapper<T> select(boolean condition,
 List<String> columns)

从接口复制的说明: Query

指定查询字段

指定者:

select 在接口中 Query<QueryWrapper<T>,T,String>

参数:

condition - 执行条件

columns - 字段列表

返回:

children

select

public QueryWrapper<T> select(Class<T> entityClass,
 Predicate<TableFieldInfo> predicate)

从接口复制的说明: Query

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)

指定者:

select 在接口中 Query<QueryWrapper<T>,T,String>

参数:

predicate - 过滤方式

返回:

children

getSqlSelect

public String getSqlSelect()

从接口复制的说明: Query

查询条件 SQL 片段

指定者:

getSqlSelect 在接口中 Query<QueryWrapper<T>,T,String>

覆盖:

getSqlSelect 在类中 Wrapper<T>

lambda

public LambdaQueryWrapper<T> lambda()

返回一个支持 lambda 函数写法的 wrapper

instance

protected QueryWrapper<T> instance()

用于生成嵌套 sql

故 sqlSelect 不向下传递

指定者:

instance 在类中 AbstractWrapper<T,String,QueryWrapper<T>>

clear

public void clear()

从类复制的说明: Wrapper

条件清空

覆盖:

clear 在类中 AbstractWrapper<T,String,QueryWrapper<T>>