third_codes/mybatis-plus-join
1
0
Fork 0
mirror of https://gitee.com/best_handsome/mybatis-plus-join synced 2025-07-11 00:02:22 +08:00
Code Issues Packages Projects Releases Wiki Activity

https://gitee.com/best_handsome/mybatis-plus-join/issues/I3RS8S

Browse Source
This commit is contained in:
admin 2021-05-18 15:20:36 +08:00
parent 133f781d2d
commit 83bfea17bc
5 changed files with 23 additions and 290 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

252
src/main/java/com/github/yulichang/query/MPJLambdaQueryWrapper.java
View File

@ -1,252 +0,0 @@
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 com.github.yulichang.toolkit.LambdaUtils;
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 + LambdaUtils.getColumn(s));
}
}
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
View File

@ -172,13 +172,6 @@ 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

22
src/main/java/com/github/yulichang/toolkit/LambdaUtils.java
View File

@ -1,12 +1,11 @@
package com.github.yulichang.toolkit;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.core.toolkit.support.ColumnCache;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import com.baomidou.mybatisplus.core.toolkit.support.SerializedLambda;
import com.github.yulichang.exception.MPJException;
import org.apache.ibatis.reflection.property.PropertyNamer;
import java.util.Objects;
import java.util.Map;
/**
* @author yulichang
@ -22,21 +21,6 @@ public final class LambdaUtils {
return PropertyNamer.methodToProperty(com.baomidou.mybatisplus.core.toolkit.LambdaUtils.resolve(fn).getImplMethodName());
}
/**
* 获取列名
*/
public static <T> String getColumn(SFunction<T, ?> fn) {
SerializedLambda lambda = com.baomidou.mybatisplus.core.toolkit.LambdaUtils.resolve(fn);
String fieldName = PropertyNamer.methodToProperty(lambda.getImplMethodName());
try {
TableField annotation = lambda.getImplClass().getDeclaredField(fieldName).getAnnotation(TableField.class);
if (Objects.nonNull(annotation) && StringUtils.isNotBlank(annotation.value())) {
return annotation.value();
}
} catch (NoSuchFieldException ignored) {
}
return StringUtils.camelToUnderline(fieldName);
}
@SuppressWarnings("unchecked")
public static <T> Class<T> getEntityClass(SFunction<T, ?> fn) {

22
src/main/java/com/github/yulichang/wrapper/MPJAbstractLambdaWrapper.java
View File

@ -25,8 +25,10 @@ public abstract class MPJAbstractLambdaWrapper<T, Children extends MPJAbstractLa
*/
protected Map<Class<?>, Integer> subTable = new HashMap<>();
private Map<String, ColumnCache> columnMap = null;
private boolean initColumnMap = false;
/**
* 缓存字段
*/
protected Map<Class<?>, Map<String, ColumnCache>> columnMap = new HashMap<>();
@Override
protected <X> String columnToString(X column) {
@ -39,12 +41,18 @@ public abstract class MPJAbstractLambdaWrapper<T, Children extends MPJAbstractLa
}
protected String columnToString(SFunction<?, ?> column, boolean onlyColumn) {
if (!initColumnMap) {
columnMap = com.baomidou.mybatisplus.core.toolkit.LambdaUtils.getColumnMap(LambdaUtils.getEntityClass(column));
initColumnMap = true;
}
return Constant.TABLE_ALIAS + getDefault(subTable.get(LambdaUtils.getEntityClass(column))) + StringPool.DOT +
columnMap.get(LambdaUtils.getName(column)).getColumn();
getCache(column).getColumn();
}
protected ColumnCache getCache(SFunction<?, ?> fn) {
Class<?> aClass = LambdaUtils.getEntityClass(fn);
Map<String, ColumnCache> cacheMap = columnMap.get(aClass);
if (cacheMap == null) {
cacheMap = com.baomidou.mybatisplus.core.toolkit.LambdaUtils.getColumnMap(aClass);
columnMap.put(aClass, cacheMap);
}
return cacheMap.get(com.baomidou.mybatisplus.core.toolkit.LambdaUtils.formatKey(LambdaUtils.getName(fn)));
}
protected String getDefault(Integer i) {

10
src/main/java/com/github/yulichang/wrapper/MPJLambdaWrapper.java
View File

@ -98,7 +98,7 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
public final <S> MPJLambdaWrapper<T> select(SFunction<S, ?>... columns) {
if (ArrayUtils.isNotEmpty(columns)) {
for (SFunction<S, ?> s : columns) {
selectColumns.add(new SelectColumn(LambdaUtils.getEntityClass(s), LambdaUtils.getColumn(s), null));
selectColumns.add(new SelectColumn(LambdaUtils.getEntityClass(s), getCache(s).getColumn(), null));
}
}
return typedThis;
@ -120,7 +120,7 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
* @since 1.1.3
*/
public final <S, X> MPJLambdaWrapper<T> selectAs(SFunction<S, ?> columns, String alias) {
selectColumns.add(new SelectColumn(LambdaUtils.getEntityClass(columns), LambdaUtils.getColumn(columns), alias));
selectColumns.add(new SelectColumn(LambdaUtils.getEntityClass(columns), getCache(columns).getColumn(), alias));
return typedThis;
}
@ -150,7 +150,7 @@ 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(LambdaUtils.getEntityClass(s), LambdaUtils.getColumn(s), null));
ignoreColumns.add(new SelectColumn(LambdaUtils.getEntityClass(s), getCache(s).getColumn(), null));
}
}
return typedThis;
@ -210,11 +210,11 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
.append(Constant.ON_TABLE_ALIAS)
.append(tableIndex)
.append(StringPool.DOT)
.append(LambdaUtils.getColumn(left))
.append(getCache(left).getColumn())
.append(Constant.EQUALS_TABLE_ALIAS)
.append(getDefault(subTable.get(LambdaUtils.getEntityClass(right))))
.append(StringPool.DOT)
.append(LambdaUtils.getColumn(right));
.append(getCache(right).getColumn());
tableIndex++;
if (StringUtils.isBlank(from.getStringValue())) {
from.setStringValue(sb.toString());