com.alilitech.mybatis.jpa.statement.support.PreMapperStatementBuilder4DeleteBatch Maven / Gradle / Ivy

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/*
 *    Copyright 2017-2022 the original author or authors.
 *
 *    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.alilitech.mybatis.jpa.statement.support;

import com.alilitech.mybatis.jpa.definition.GenericType;
import com.alilitech.mybatis.jpa.meta.ColumnMetaData;
import com.alilitech.mybatis.jpa.statement.MethodType;
import com.alilitech.mybatis.jpa.statement.PreMapperStatement;
import com.alilitech.mybatis.jpa.statement.PreMapperStatementBuilder;
import org.apache.ibatis.builder.MapperBuilderAssistant;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.session.Configuration;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;


/**
 *
 * @author Zhou Xiaoxiang
 * @since 1.0
 */
public class PreMapperStatementBuilder4DeleteBatch extends PreMapperStatementBuilder {

    public PreMapperStatementBuilder4DeleteBatch(Configuration configuration, MapperBuilderAssistant builderAssistant, MethodType methodType) {
        super(configuration, builderAssistant, methodType);
    }

    @Override
    protected void buildPreMapperStatementExtend(PreMapperStatement preMapperStatement, GenericType genericType) {
        preMapperStatement.setResultType(int.class);
        preMapperStatement.setSqlCommandType(SqlCommandType.DELETE);
        setNoKeyGenerator(preMapperStatement);
    }

    @Override
    protected String buildSQL() {

        //sql parts
        List sqlParts = null;
        if(entityMetaData.isCompositePrimaryKey()) {
            String primaryKeys = entityMetaData.getPrimaryColumnMetaDatas().stream().map(ColumnMetaData::getColumnName).collect(Collectors.joining(", ", "(", ")"));
            String primaryItems = entityMetaData.getPrimaryColumnMetaDatas().stream().map(ColumnMetaData::getProperty).map(s -> "#{id." + s + "}").collect(Collectors.joining(", "));

            sqlParts = Arrays.asList(
                    "DELETE",
                    "FROM",
                    entityMetaData.getTableName(),
                    "WHERE",
                    primaryKeys,
                    "IN",
                    "",
                    "(" + primaryItems + ")",
                    ""
            );
        } else {
            sqlParts = Arrays.asList(
                    "DELETE",
                    "FROM",
                    entityMetaData.getTableName(),
                    "WHERE",
                    entityMetaData.getPrimaryColumnMetaData().getColumnName(),
                    "IN",
                    "",
                    "#{id}",
                    ""
            );
        }

        return buildScript(sqlParts);
    }

    protected Class getParameterTypeClass() {
        return entityMetaData.getIdType();
    }

}