mirror of
https://gitee.com/best_handsome/mybatis-plus-join
synced 2025-07-11 00:02:22 +08:00
311 lines
10 KiB
Java
311 lines
10 KiB
Java
package com.github.yulichang.wrapper;
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import com.baomidou.mybatisplus.core.conditions.SharedString;
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import com.baomidou.mybatisplus.core.conditions.segments.MergeSegments;
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import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
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import com.baomidou.mybatisplus.core.metadata.TableInfo;
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import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
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import com.baomidou.mybatisplus.core.toolkit.*;
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import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
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import com.github.yulichang.toolkit.Constant;
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import com.github.yulichang.toolkit.LambdaUtils;
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import com.github.yulichang.toolkit.MPJWrappers;
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import com.github.yulichang.wrapper.enums.BaseFuncEnum;
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import com.github.yulichang.wrapper.interfaces.LambdaJoin;
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import com.github.yulichang.wrapper.interfaces.Query;
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import com.github.yulichang.wrapper.interfaces.on.OnFunction;
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import lombok.Data;
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import lombok.Getter;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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/**
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* 参考 {@link com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper}
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* Lambda 语法使用 Wrapper
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* <p>
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* 推荐使用 MPJWrappers.<UserDO>lambdaJoin();构造
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*
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* @author yulichang
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* @see MPJWrappers
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*/
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@SuppressWarnings("unused")
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public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWrapper<T>>
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implements Query<MPJLambdaWrapper<T>>, LambdaJoin<MPJLambdaWrapper<T>> {
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/**
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* 查询字段 sql
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*/
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private SharedString sqlSelect = new SharedString();
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/**
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* 查询表
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*/
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private final SharedString from = new SharedString();
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/**
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* 主表别名
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*/
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private final SharedString alias = new SharedString(Constant.TABLE_ALIAS);
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/**
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* 查询的字段
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*/
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private final List<SelectColumn> selectColumns = new ArrayList<>();
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/**
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* 忽略查询的字段
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*/
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private final List<SelectColumn> ignoreColumns = new ArrayList<>();
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/**
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* 表序号
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*/
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private int tableIndex = 1;
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/**
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* ON sql wrapper集合
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*/
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private final List<MPJLambdaWrapper<?>> onWrappers = new ArrayList<>();
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/**
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* 连表关键字 on 条件 func 使用
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*/
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@Getter
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private String keyWord;
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/**
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* 连表实体类 on 条件 func 使用
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*/
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@Getter
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private Class<?> joinClass;
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/**
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* 不建议直接 new 该实例，使用 MPJWrappers.<UserDO>lambdaQuery()
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*/
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public MPJLambdaWrapper() {
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super.initNeed();
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}
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/**
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* 不建议直接 new 该实例，使用 MPJWrappers.<UserDO>lambdaQuery()
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*/
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MPJLambdaWrapper(T entity, Class<T> entityClass, SharedString sqlSelect, AtomicInteger paramNameSeq,
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Map<String, Object> paramNameValuePairs, MergeSegments mergeSegments,
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SharedString lastSql, SharedString sqlComment, SharedString sqlFirst,
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Map<Class<?>, Integer> subTable, String keyWord, Class<?> joinClass) {
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super.setEntity(entity);
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super.setEntityClass(entityClass);
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this.paramNameSeq = paramNameSeq;
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this.paramNameValuePairs = paramNameValuePairs;
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this.expression = mergeSegments;
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this.sqlSelect = sqlSelect;
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this.lastSql = lastSql;
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this.sqlComment = sqlComment;
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this.sqlFirst = sqlFirst;
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this.subTable = subTable;
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this.keyWord = keyWord;
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this.joinClass = joinClass;
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}
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@Override
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@SafeVarargs
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public final <S> MPJLambdaWrapper<T> select(SFunction<S, ?>... columns) {
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if (ArrayUtils.isNotEmpty(columns)) {
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for (SFunction<S, ?> s : columns) {
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selectColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(s), getCache(s).getColumn()));
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}
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}
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return typedThis;
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}
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@Override
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public <E> MPJLambdaWrapper<T> select(Class<E> entityClass, Predicate<TableFieldInfo> predicate) {
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TableInfo info = TableInfoHelper.getTableInfo(entityClass);
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Assert.notNull(info, "table can not be find");
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info.getFieldList().stream().filter(predicate).collect(Collectors.toList()).forEach(
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i -> selectColumns.add(SelectColumn.of(entityClass, i.getColumn())));
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return typedThis;
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}
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@Override
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public <S> MPJLambdaWrapper<T> selectAs(SFunction<S, ?> column, String alias) {
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selectColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(column), getCache(column).getColumn(), alias));
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return typedThis;
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}
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public <S> MPJLambdaWrapper<T> selectFunc(boolean condition, BaseFuncEnum funcEnum, SFunction<S, ?> column, String alias) {
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if (condition) {
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selectColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(column), getCache(column).getColumn(), alias, funcEnum));
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}
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return typedThis;
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}
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@Override
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public MPJLambdaWrapper<T> selectFunc(boolean condition, BaseFuncEnum funcEnum, Object column, String alias) {
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if (condition) {
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selectColumns.add(SelectColumn.of(null, column.toString(), alias, funcEnum));
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}
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return typedThis;
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}
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public final MPJLambdaWrapper<T> selectAll(Class<?> clazz) {
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TableInfo info = TableInfoHelper.getTableInfo(clazz);
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Assert.notNull(info, "table can not be find -> %s", clazz);
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if (info.havePK()) {
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selectColumns.add(SelectColumn.of(clazz, info.getKeyColumn()));
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}
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info.getFieldList().forEach(c ->
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selectColumns.add(SelectColumn.of(clazz, c.getColumn())));
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return typedThis;
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}
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@Override
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@SafeVarargs
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public final <S> MPJLambdaWrapper<T> selectIgnore(SFunction<S, ?>... columns) {
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if (ArrayUtils.isNotEmpty(columns)) {
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for (SFunction<S, ?> s : columns) {
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ignoreColumns.add(SelectColumn.of(LambdaUtils.getEntityClass(s), getCache(s).getColumn()));
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}
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}
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return typedThis;
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}
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/**
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* 查询条件 SQL 片段
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*/
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@Override
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public String getSqlSelect() {
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if (StringUtils.isBlank(sqlSelect.getStringValue())) {
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if (CollectionUtils.isNotEmpty(ignoreColumns)) {
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selectColumns.removeIf(c -> c.getFuncEnum() == null && ignoreColumns.stream().anyMatch(i ->
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i.getClazz() == c.getClazz() && Objects.equals(c.getColumnName(), i.getColumnName())));
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}
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String s = selectColumns.stream().map(i -> {
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String str = Constant.TABLE_ALIAS + getDefault(subTable.get(i.getClazz())) + StringPool.DOT + i.getColumnName();
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return (i.getFuncEnum() == null ? str : String.format(i.getFuncEnum().getSql(), str)) +
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(StringUtils.isBlank(i.getAlias()) ? StringPool.EMPTY : (Constant.AS + i.getAlias()));
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}).collect(Collectors.joining(StringPool.COMMA));
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sqlSelect.setStringValue(s);
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}
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return sqlSelect.getStringValue();
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}
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/**
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* 获取连表部分语句
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*/
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public String getFrom() {
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if (StringUtils.isBlank(from.getStringValue())) {
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StringBuilder value = new StringBuilder();
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for (MPJLambdaWrapper<?> wrapper : onWrappers) {
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String tableName = TableInfoHelper.getTableInfo(wrapper.getJoinClass()).getTableName();
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value.append(wrapper.getKeyWord())
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.append(tableName)
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.append(Constant.SPACE_TABLE_ALIAS)
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.append(subTable.get(wrapper.getJoinClass()))
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.append(Constant.ON)
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.append(wrapper.getExpression().getNormal().getSqlSegment());
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}
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from.setStringValue(value.toString());
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}
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return from.getStringValue();
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}
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public String getAlias() {
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return alias.getStringValue();
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}
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/**
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* 用于生成嵌套 sql
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* <p>故 sqlSelect 不向下传递</p>
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*/
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@Override
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protected MPJLambdaWrapper<T> instance() {
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return instance(null, null);
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}
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protected MPJLambdaWrapper<T> instance(String keyWord, Class<?> joinClass) {
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return new MPJLambdaWrapper<>(getEntity(), getEntityClass(), null, paramNameSeq, paramNameValuePairs,
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new MergeSegments(), SharedString.emptyString(), SharedString.emptyString(), SharedString.emptyString(),
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this.subTable, keyWord, joinClass);
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}
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@Override
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public void clear() {
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super.clear();
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sqlSelect.toNull();
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from.toNull();
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selectColumns.clear();
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ignoreColumns.clear();
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subTable.clear();
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}
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@Override
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public <R> MPJLambdaWrapper<T> join(String keyWord, boolean condition, Class<R> clazz, OnFunction function) {
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if (condition) {
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MPJLambdaWrapper<?> apply = function.apply(instance(keyWord, clazz));
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onWrappers.add(apply);
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subTable.put(clazz, tableIndex);
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tableIndex++;
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}
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return typedThis;
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}
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/**
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* select字段
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*/
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@Data
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private static class SelectColumn {
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/**
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* 字段实体类
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*/
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private Class<?> clazz;
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/**
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* 数据库字段名
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*/
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private String columnName;
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/**
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* 字段别名
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*/
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private String alias;
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/**
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* 字段函数
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*/
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private BaseFuncEnum funcEnum;
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/**
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* 自定义函数填充参数
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*/
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private List<SFunction<?, ?>> funcArgs;
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private SelectColumn(Class<?> clazz, String columnName, String alias, BaseFuncEnum funcEnum) {
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this.clazz = clazz;
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this.columnName = columnName;
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this.alias = alias;
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this.funcEnum = funcEnum;
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}
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public static SelectColumn of(Class<?> clazz, String columnName) {
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return new SelectColumn(clazz, columnName, null, null);
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}
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public static SelectColumn of(Class<?> clazz, String columnName, String alias) {
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return new SelectColumn(clazz, columnName, alias, null);
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}
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public static SelectColumn of(Class<?> clazz, String columnName, String alias, BaseFuncEnum funcEnum) {
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return new SelectColumn(clazz, columnName, alias, funcEnum);
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}
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}
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}
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