com.baomidou.mybatisplus.extension.kotlin.KtUpdateWrapper.kt Maven / Gradle / Ivy

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An enhanced toolkit of Mybatis to simplify development.
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/*
 * Copyright (c) 2011-2022, baomidou ([email protected]).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.baomidou.mybatisplus.extension.kotlin

import com.baomidou.mybatisplus.core.conditions.SharedString
import com.baomidou.mybatisplus.core.conditions.segments.MergeSegments
import com.baomidou.mybatisplus.core.conditions.update.Update
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils
import com.baomidou.mybatisplus.core.toolkit.Constants
import com.baomidou.mybatisplus.core.toolkit.StringPool
import com.baomidou.mybatisplus.core.toolkit.StringUtils
import com.baomidou.mybatisplus.core.toolkit.support.ColumnCache
import java.util.concurrent.atomic.AtomicInteger
import java.util.stream.Collectors.joining
import kotlin.reflect.KProperty

/**
 * Kotlin Lambda 更新封装
 *
 * @author yangyuhan
 * @since 2018-11-02
 */
open class KtUpdateWrapper : AbstractKtWrapper>, Update, KProperty<*>> {

    /**
     * SQL 更新字段内容，例如：name='1', age=2
     */
    private val sqlSet = ArrayList()

    constructor(entity: T) {
        this.entity = entity
        super.initNeed()
    }

    constructor(entityClass: Class) {
        this.entityClass = entityClass
        super.initNeed()
    }

    internal constructor(entity: T?, paramNameSeq: AtomicInteger, paramNameValuePairs: Map,
                         columnMap: Map, lastSql: SharedString, sqlComment: SharedString,
                         sqlFirst: SharedString) {
        this.entity = entity
        this.paramNameSeq = paramNameSeq
        this.paramNameValuePairs = paramNameValuePairs
        this.expression = MergeSegments()
        this.columnMap = columnMap
        this.lastSql = lastSql
        this.sqlComment = sqlComment
        this.sqlFirst = sqlFirst
    }

    override fun getSqlSet(): String? {
        return if (CollectionUtils.isEmpty(sqlSet)) null
        else sqlSet.stream().collect(joining(StringPool.COMMA))
    }

    override fun setSql(condition: Boolean, sql: String): KtUpdateWrapper {
        if (condition && StringUtils.isNotBlank(sql)) {
            sqlSet.add(sql)
        }
        return typedThis
    }

    override fun set(condition: Boolean, column: KProperty<*>, value: Any?, mapping: String?): KtUpdateWrapper {
        return maybeDo(condition) {
            val sql = formatParam(mapping, value)
            sqlSet.add(columnsToString(column) + Constants.EQUALS + sql)
        }
    }

    override fun instance(): KtUpdateWrapper {
        return KtUpdateWrapper(entity, paramNameSeq, paramNameValuePairs, columnMap,
            SharedString.emptyString(), SharedString.emptyString(), SharedString.emptyString())
    }

    override fun clear() {
        super.clear()
        sqlSet.clear()
    }
}