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连表查询支持聚合函数查询

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admin 2021-06-01 16:44:54 +08:00
parent 3fcd8cc869
commit 52f947b477
9 changed files with 436 additions and 85 deletions
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14
src/main/java/com/github/yulichang/interceptor/MPJInterceptor.java
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@ -25,8 +25,6 @@ import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.apache.ibatis.type.UnknownTypeHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
@ -110,17 +108,7 @@ public class MPJInterceptor implements Interceptor {
*/
private ResultMap newResultMap(MappedStatement ms, Class<?> resultType) {
TableInfo tableInfo = TableInfoHelper.getTableInfo(resultType);
if (tableInfo != null && tableInfo.isAutoInitResultMap()) {
if (tableInfo.getEntityType() != resultType) {
try {
Method info = TableInfoHelper.class.getDeclaredMethod("initTableInfo", Configuration.class, String.class, Class.class);
info.setAccessible(true);
Object invoke = info.invoke(TableInfoHelper.class, ms.getConfiguration(), ms.getId().substring(0, ms.getId().lastIndexOf(".")), resultType);
tableInfo = (TableInfo) invoke;
} catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
e.printStackTrace();
}
}
if (tableInfo != null && tableInfo.isAutoInitResultMap() && tableInfo.getEntityType() == resultType) {
return initResultMapIfNeed(tableInfo, resultType);
}
return new ResultMap.Builder(ms.getConfiguration(), ms.getId(), resultType, EMPTY_RESULT_MAPPING).build();

251
src/main/java/com/github/yulichang/query/MPJLambdaQueryWrapper.java Normal file
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@ -0,0 +1,251 @@
package com.github.yulichang.query;
import com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper;
import com.baomidou.mybatisplus.core.conditions.SharedString;
import com.baomidou.mybatisplus.core.conditions.query.Query;
import com.baomidou.mybatisplus.core.conditions.segments.MergeSegments;
import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
import com.baomidou.mybatisplus.core.toolkit.ArrayUtils;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import com.github.yulichang.query.interfaces.MPJJoin;
import com.github.yulichang.toolkit.Constant;
import org.springframework.util.Assert;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Predicate;
import java.util.stream.Collectors;
/**
* 不推荐使用这wrapper
* 这种既有string又有lambda对开发人员并不友好
* <p>
* 推荐使用以下两个类 :
* String -> {@link MPJQueryWrapper<T>}
* lambda -> {@link com.github.yulichang.wrapper.MPJLambdaWrapper<T>}
* <p>
*
* @author yulichang
*/
@Deprecated
@SuppressWarnings("DeprecatedIsStillUsed")
public class MPJLambdaQueryWrapper<T> extends AbstractLambdaWrapper<T, MPJLambdaQueryWrapper<T>>
implements Query<MPJLambdaQueryWrapper<T>, T, SFunction<T, ?>>, MPJJoin<MPJLambdaQueryWrapper<T>> {
/**
* 查询字段
*/
private SharedString sqlSelect = new SharedString();
/**
* 连表字段
*/
private SharedString from = SharedString.emptyString();
/**
* 主表别名
*/
private final SharedString alias = new SharedString(Constant.TABLE_ALIAS);
/**
* 查询的列
*/
private List<String> selectColumns = new ArrayList<>();
/**
* 排除的字段
*/
private List<String> ignoreColumns = new ArrayList<>();
/**
* 不建议直接 new 该实例，使用 Wrappers.lambdaQuery(entity)
*/
public MPJLambdaQueryWrapper() {
super.initNeed();
}
/**
* 不建议直接 new 该实例，使用 Wrappers.lambdaQuery(...)
*/
MPJLambdaQueryWrapper(T entity, Class<T> entityClass, SharedString from, SharedString sqlSelect, AtomicInteger paramNameSeq,
Map<String, Object> paramNameValuePairs, MergeSegments mergeSegments,
SharedString lastSql, SharedString sqlComment, SharedString sqlFirst,
List<String> selectColumns, List<String> ignoreColumns) {
super.setEntity(entity);
super.setEntityClass(entityClass);
this.paramNameSeq = paramNameSeq;
this.paramNameValuePairs = paramNameValuePairs;
this.expression = mergeSegments;
this.sqlSelect = sqlSelect;
this.from = from;
this.lastSql = lastSql;
this.sqlComment = sqlComment;
this.sqlFirst = sqlFirst;
this.selectColumns = selectColumns;
this.ignoreColumns = ignoreColumns;
}
/**
* SELECT 部分 SQL 设置
*
* @param columns 查询字段
*/
@SafeVarargs
public final MPJLambdaQueryWrapper<T> select(SFunction<T, ?>... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
for (SFunction<T, ?> s : columns) {
selectColumns.add(columnToString(s, false));
}
}
return typedThis;
}
/**
* 忽略查询字段
* <p>
* 用法: selectIgnore("t.id","t.sex","a.area")
*
* @since 1.1.3
*/
public MPJLambdaQueryWrapper<T> selectIgnore(String... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
ignoreColumns.addAll(Arrays.asList(columns));
}
return typedThis;
}
/**
* 忽略查询字段
* <p>
* 用法: selectIgnore("t.id","t.sex","a.area")
*
* @since 1.1.3
*/
@SafeVarargs
public final MPJLambdaQueryWrapper<T> selectIgnore(SFunction<T, ?>... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
for (SFunction<T, ?> s : columns) {
ignoreColumns.add(Constant.TABLE_ALIAS + StringPool.DOT + getColumnCache(s).getColumn());
}
}
return typedThis;
}
@Override
protected String columnToString(SFunction<T, ?> column, boolean onlyColumn) {
return Constant.TABLE_ALIAS + StringPool.DOT + super.columnToString(column, onlyColumn);
}
public MPJLambdaQueryWrapper<T> select(String... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
Collections.addAll(selectColumns, columns);
}
return typedThis;
}
/**
* 只针对主表
* <p>
* 过滤查询的字段信息(主键除外!)
* <p>例1: 只要 java 字段名以 "test" 开头的 -> select(i -&gt; i.getProperty().startsWith("test"))</p>
* <p>例2: 只要 java 字段属性是 CharSequence 类型的 -> select(TableFieldInfo::isCharSequence)</p>
* <p>例3: 只要 java 字段没有填充策略的 -> select(i -&gt; i.getFieldFill() == FieldFill.DEFAULT)</p>
* <p>例4: 要全部字段 -> select(i -&gt; true)</p>
* <p>例5: 只要主键字段 -> select(i -&gt; false)</p>
*
* @param predicate 过滤方式
* @return this
*/
@Override
public MPJLambdaQueryWrapper<T> select(Class<T> entityClass, Predicate<TableFieldInfo> predicate) {
TableInfo info = TableInfoHelper.getTableInfo(entityClass);
Assert.notNull(info, "can not find table info");
selectColumns.addAll(info.getFieldList().stream().filter(predicate).map(c ->
Constant.TABLE_ALIAS + StringPool.DOT + c.getColumn()).collect(Collectors.toList()));
return typedThis;
}
/**
* 查询主表全部字段
*
* @param clazz 主表class
*/
public final MPJLambdaQueryWrapper<T> selectAll(Class<T> clazz) {
return selectAll(clazz, Constant.TABLE_ALIAS);
}
/**
* 查询表全部字段
*
* @param clazz 表实体
* @param as 表别名
*/
public final MPJLambdaQueryWrapper<T> selectAll(Class<?> clazz, String as) {
TableInfo info = TableInfoHelper.getTableInfo(clazz);
Assert.notNull(info, "can not find table info");
if (info.havePK()) {
selectColumns.add(as + StringPool.DOT + info.getKeyColumn());
}
selectColumns.addAll(info.getFieldList().stream().map(i ->
as + StringPool.DOT + i.getColumn()).collect(Collectors.toList()));
return typedThis;
}
/**
* 返回一个支持 lambda 函数写法的 wrapper
*/
public MPJQueryWrapper<T> stringQuery() {
return new MPJQueryWrapper<>(getEntity(), getEntityClass(), paramNameSeq, paramNameValuePairs,
expression, sqlSelect, from, lastSql, sqlComment, sqlFirst, selectColumns, ignoreColumns);
}
@Override
public String getSqlSelect() {
if (StringUtils.isBlank(sqlSelect.getStringValue())) {
if (CollectionUtils.isNotEmpty(ignoreColumns)) {
selectColumns.removeIf(ignoreColumns::contains);
}
sqlSelect.setStringValue(String.join(StringPool.COMMA, selectColumns));
}
return sqlSelect.getStringValue();
}
public String getFrom() {
return from.getStringValue();
}
public String getAlias() {
return alias.getStringValue();
}
/**
* 用于生成嵌套 sql
* <p>故 sqlSelect selectColumn ignoreColumns from不向下传递</p>
*/
@Override
protected MPJLambdaQueryWrapper<T> instance() {
return new MPJLambdaQueryWrapper<>(getEntity(), getEntityClass(), null, null, paramNameSeq, paramNameValuePairs,
new MergeSegments(), SharedString.emptyString(), SharedString.emptyString(), SharedString.emptyString(), null, null);
}
@Override
public void clear() {
super.clear();
sqlSelect.toNull();
}
@Override
public MPJLambdaQueryWrapper<T> join(String keyWord, boolean condition, String joinSql) {
if (condition) {
from.setStringValue(from.getStringValue() + keyWord + joinSql);
}
return typedThis;
}
}

7
src/main/java/com/github/yulichang/query/MPJQueryWrapper.java
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@ -172,6 +172,13 @@ public class MPJQueryWrapper<T> extends AbstractWrapper<T, String, MPJQueryWrapp
return alias.getStringValue();
}
/**
* 返回一个支持 lambda 函数写法的 wrapper
*/
public MPJLambdaQueryWrapper<T> lambda() {
return new MPJLambdaQueryWrapper<>(getEntity(), getEntityClass(), from, sqlSelect, paramNameSeq, paramNameValuePairs,
expression, lastSql, sqlComment, sqlFirst, selectColumns, ignoreColumns);
}
/**
* 用于生成嵌套 sql

8
src/main/java/com/github/yulichang/wrapper/MPJAbstractLambdaWrapper.java
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@ -14,7 +14,9 @@ import java.util.Objects;
import static java.util.stream.Collectors.joining;
/**
* copy {@link com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper}
* 参考 {@link com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper}
*
* @author yulichang
*/
@SuppressWarnings("serial")
public abstract class MPJAbstractLambdaWrapper<T, Children extends MPJAbstractLambdaWrapper<T, Children>>
@ -49,10 +51,10 @@ public abstract class MPJAbstractLambdaWrapper<T, Children extends MPJAbstractLa
Class<?> aClass = LambdaUtils.getEntityClass(fn);
Map<String, ColumnCache> cacheMap = columnMap.get(aClass);
if (cacheMap == null) {
cacheMap = com.baomidou.mybatisplus.core.toolkit.LambdaUtils.getColumnMap(aClass);
cacheMap = LambdaUtils.getColumnMap(aClass);
columnMap.put(aClass, cacheMap);
}
return cacheMap.get(com.baomidou.mybatisplus.core.toolkit.LambdaUtils.formatKey(LambdaUtils.getName(fn)));
return cacheMap.get(LambdaUtils.formatKey(LambdaUtils.getName(fn)));
}
protected String getDefault(Integer i) {

72
src/main/java/com/github/yulichang/wrapper/MPJLambdaWrapper.java
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@ -8,8 +8,10 @@ import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
import com.baomidou.mybatisplus.core.toolkit.*;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import com.github.yulichang.toolkit.Constant;
import com.github.yulichang.toolkit.LambdaUtils;
import com.github.yulichang.wrapper.enums.BaseFuncEnum;
import com.github.yulichang.wrapper.interfaces.LambdaJoin;
import com.github.yulichang.wrapper.interfaces.SFunctionQuery;
import com.github.yulichang.wrapper.interfaces.Query;
import com.github.yulichang.wrapper.interfaces.on.OnFunction;
import lombok.Data;
import lombok.Getter;
@ -33,7 +35,7 @@ import java.util.stream.Collectors;
*/
@SuppressWarnings("all")
public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWrapper<T>>
implements SFunctionQuery<MPJLambdaWrapper<T>>, LambdaJoin<MPJLambdaWrapper<T>> {
implements Query<MPJLambdaWrapper<T>>, LambdaJoin<MPJLambdaWrapper<T>> {
/**
* 查询字段 sql
@ -116,33 +118,40 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
*
* @param columns 查询字段
*/
@Override
@SafeVarargs
public final <S> MPJLambdaWrapper<T> select(SFunction<S, ?>... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
for (SFunction<S, ?> s : columns) {
selectColumns.add(new SelectColumn(com.github.yulichang.toolkit.LambdaUtils.getEntityClass(s), getCache(s).getColumn(), null));
selectColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(s), getCache(s).getColumn()));
}
}
return typedThis;
}
@Override
public <E> MPJLambdaWrapper<T> select(Class<E> entityClass, Predicate<TableFieldInfo> predicate) {
TableInfo info = TableInfoHelper.getTableInfo(entityClass);
Assert.notNull(info, "table can not be find");
info.getFieldList().stream().filter(predicate).collect(Collectors.toList()).forEach(
i -> selectColumns.add(new SelectColumn(entityClass, i.getColumn(), null)));
i -> selectColumns.add(SelectColumn.of(entityClass, i.getColumn())));
return typedThis;
}
public final <S, X> MPJLambdaWrapper<T> selectAs(SFunction<S, ?> columns, SFunction<X, ?> alias) {
return selectAs(columns, com.github.yulichang.toolkit.LambdaUtils.getName(alias));
@Override
public <S> MPJLambdaWrapper<T> selectAs(SFunction<S, ?> column, String alias) {
selectColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(column), getCache(column).getColumn(), alias));
return typedThis;
}
/**
* @since 1.1.3
*/
public final <S, X> MPJLambdaWrapper<T> selectAs(SFunction<S, ?> columns, String alias) {
selectColumns.add(new SelectColumn(com.github.yulichang.toolkit.LambdaUtils.getEntityClass(columns), getCache(columns).getColumn(), alias));
public <S> MPJLambdaWrapper<T> selectFunc(BaseFuncEnum funcEnum, SFunction<S, ?> column, String alias) {
selectColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(column), getCache(column).getColumn(), alias, funcEnum));
return typedThis;
}
@Override
public MPJLambdaWrapper<T> selectFunc(BaseFuncEnum funcEnum, Object column, String alias) {
selectColumns.add(SelectColumn.of(null, column.toString(), alias, funcEnum));
return typedThis;
}
@ -150,10 +159,10 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
TableInfo info = TableInfoHelper.getTableInfo(clazz);
Assert.notNull(info, "table can not be find -> %s", clazz);
if (info.havePK()) {
selectColumns.add(new SelectColumn(clazz, info.getKeyColumn(), null));
selectColumns.add(SelectColumn.of(clazz, info.getKeyColumn()));
}
info.getFieldList().forEach(c ->
selectColumns.add(new SelectColumn(clazz, c.getColumn(), null)));
selectColumns.add(SelectColumn.of(clazz, c.getColumn())));
return typedThis;
}
@ -172,29 +181,35 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
public final <S> MPJLambdaWrapper<T> selectIgnore(SFunction<S, ?>... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
for (SFunction<S, ?> s : columns) {
ignoreColumns.add(new SelectColumn(com.github.yulichang.toolkit.LambdaUtils.getEntityClass(s), getCache(s).getColumn(), null));
ignoreColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(s), getCache(s).getColumn()));
}
}
return typedThis;
}
/**
* 查询条件 SQL 片段
*/
@Override
public String getSqlSelect() {
if (StringUtils.isBlank(sqlSelect.getStringValue())) {
if (CollectionUtils.isNotEmpty(ignoreColumns)) {
selectColumns.removeIf(c -> ignoreColumns.stream().anyMatch(i ->
selectColumns.removeIf(c -> c.getFuncEnum() == null && ignoreColumns.stream().anyMatch(i ->
i.getClazz() == c.getClazz() && Objects.equals(c.getColumnName(), i.getColumnName())));
}
String s = selectColumns.stream().map(i ->
Constant.TABLE_ALIAS + getDefault(subTable.get(i.getClazz())) + StringPool.DOT + i.getColumnName() +
(StringUtils.isBlank(i.getAlias()) ? StringPool.EMPTY : (Constant.AS + i.getAlias())))
.collect(Collectors.joining(StringPool.COMMA));
String s = selectColumns.stream().map(i -> {
String str = Constant.TABLE_ALIAS + getDefault(subTable.get(i.getClazz())) + StringPool.DOT + i.getColumnName();
return (i.getFuncEnum() == null ? str : String.format(i.getFuncEnum().getSql(), str)) +
(StringUtils.isBlank(i.getAlias()) ? StringPool.EMPTY : (Constant.AS + i.getAlias()));
}).collect(Collectors.joining(StringPool.COMMA));
sqlSelect.setStringValue(s);
}
return sqlSelect.getStringValue();
}
/**
* 获取连表部分语句
*/
public String getFrom() {
if (StringUtils.isBlank(from.getStringValue())) {
StringBuilder value = new StringBuilder();
@ -264,10 +279,25 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
private String alias;
public SelectColumn(Class<?> clazz, String columnName, String alias) {
private BaseFuncEnum funcEnum;
private SelectColumn(Class<?> clazz, String columnName, String alias, BaseFuncEnum funcEnum) {
this.clazz = clazz;
this.columnName = columnName;
this.alias = alias;
this.funcEnum = funcEnum;
}
public static SelectColumn of(Class<?> clazz, String columnName) {
return of(clazz, columnName, null, null);
}
public static SelectColumn of(Class<?> clazz, String columnName, String alias) {
return of(clazz, columnName, alias, null);
}
public static SelectColumn of(Class<?> clazz, String columnName, String alias, BaseFuncEnum funcEnum) {
return new SelectColumn(clazz, columnName, alias, funcEnum);
}
}
}

11
src/main/java/com/github/yulichang/wrapper/enums/BaseFuncEnum.java Normal file
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@ -0,0 +1,11 @@
package com.github.yulichang.wrapper.enums;
/**
* 函数枚举基类
*
* @author yulichang
*/
public interface BaseFuncEnum {
String getSql();
}

32
src/main/java/com/github/yulichang/wrapper/enums/DefaultFuncEnum.java Normal file
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@ -0,0 +1,32 @@
package com.github.yulichang.wrapper.enums;
/**
* 常用的sql函数枚举 默认实现
* 可以自己实现 {@link BaseFuncEnum} 自定义函数
* 目前支持一个占位符,不支持多个%s
* <p>
* 只例举几个通用的,其他函数 first() last() len() ucase() lcase() 等 或者数据库自定义函数请自行扩展
*
* @author yulichang
*/
public enum DefaultFuncEnum implements BaseFuncEnum {
SUM("SUM(%s)"),
COUNT("COUNT(%s)"),
MAX("MAX(%s)"),
MIN("MIN(%s)"),
AVG("AVG(%s)"),
LEN("LEN(%s)");
private final String sql;
DefaultFuncEnum(String sql) {
this.sql = sql;
}
@Override
public String getSql() {
return this.sql;
}
}

78
src/main/java/com/github/yulichang/wrapper/interfaces/Query.java Normal file
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@ -0,0 +1,78 @@
package com.github.yulichang.wrapper.interfaces;
import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import com.github.yulichang.toolkit.LambdaUtils;
import com.github.yulichang.wrapper.enums.BaseFuncEnum;
import java.io.Serializable;
import java.util.function.Predicate;
/**
* 参考 {@link com.baomidou.mybatisplus.core.conditions.query.Query}
*
* @author yulichang
*/
public interface Query<Children> extends Serializable {
/**
* 设置查询字段
*
* @param columns 字段数组
* @return children
*/
@SuppressWarnings("unchecked")
<E> Children select(SFunction<E, ?>... columns);
/**
* 过滤查询的字段信息(主键除外!)
* <p>例1: 只要 java 字段名以 "test" 开头的 -> select(i -> i.getProperty().startsWith("test"))</p>
* <p>例2: 只要 java 字段属性是 CharSequence 类型的 -> select(TableFieldInfo::isCharSequence)</p>
* <p>例3: 只要 java 字段没有填充策略的 -> select(i -> i.getFieldFill() == FieldFill.DEFAULT)</p>
* <p>例4: 要全部字段 -> select(i -> true)</p>
* <p>例5: 只要主键字段 -> select(i -> false)</p>
*
* @param predicate 过滤方式
* @return children
*/
<E> Children select(Class<E> entityClass, Predicate<TableFieldInfo> predicate);
default <S, X> Children selectAs(SFunction<S, ?> columns, SFunction<X, ?> alias) {
return selectAs(columns, LambdaUtils.getName(alias));
}
/**
* 别名查询
*/
<S> Children selectAs(SFunction<S, ?> column, String alias);
default <S, X> Children selectFunc(BaseFuncEnum funcEnum, SFunction<S, ?> column) {
return selectFunc(funcEnum, column, column);
}
default <S, X> Children selectFunc(BaseFuncEnum funcEnum, SFunction<S, ?> column, SFunction<X, ?> alias) {
return selectFunc(funcEnum, column, LambdaUtils.getName(alias));
}
/**
* 聚合函数查询
*
* @param funcEnum 函数枚举 {@link com.github.yulichang.wrapper.enums.DefaultFuncEnum}
* @param column 函数作用的字段
* @param alias 别名
*/
<S> Children selectFunc(BaseFuncEnum funcEnum, SFunction<S, ?> column, String alias);
default <X> Children selectFunc(BaseFuncEnum funcEnum, Object column, SFunction<X, ?> alias) {
return selectFunc(funcEnum, column, LambdaUtils.getName(alias));
}
Children selectFunc(BaseFuncEnum funcEnum, Object column, String alias);
/**
* select sql 片段
*/
String getSqlSelect();
}

48
src/main/java/com/github/yulichang/wrapper/interfaces/SFunctionQuery.java
View File

@ -1,48 +0,0 @@
package com.github.yulichang.wrapper.interfaces;
import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import java.io.Serializable;
import java.util.function.Predicate;
/**
* copy {@link com.baomidou.mybatisplus.core.conditions.query.Query}
*/
public interface SFunctionQuery<Children> extends Serializable {
/**
* 设置查询字段
*
* @param columns 字段数组
* @return children
*/
@SuppressWarnings("unchecked")
<E> Children select(SFunction<E, ?>... columns);
/**
* ignore
* <p>注意只有内部有 entity 才能使用该方法</p>
*/
default Children select(Predicate<TableFieldInfo> predicate) {
return select(null, predicate);
}
/**
* 过滤查询的字段信息(主键除外!)
* <p>例1: 只要 java 字段名以 "test" 开头的 -> select(i -> i.getProperty().startsWith("test"))</p>
* <p>例2: 只要 java 字段属性是 CharSequence 类型的 -> select(TableFieldInfo::isCharSequence)</p>
* <p>例3: 只要 java 字段没有填充策略的 -> select(i -> i.getFieldFill() == FieldFill.DEFAULT)</p>
* <p>例4: 要全部字段 -> select(i -> true)</p>
* <p>例5: 只要主键字段 -> select(i -> false)</p>
*
* @param predicate 过滤方式
* @return children
*/
<E>Children select(Class<E> entityClass, Predicate<TableFieldInfo> predicate);
/**
* 查询条件 SQL 片段
*/
String getSqlSelect();
}