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+/*
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+ * Copyright (c) 2011-2020, baomidou (jobob@qq.com).
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+ * <p>
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+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
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+ * use this file except in compliance with the License. You may obtain a copy of
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+ * the License at
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+ * <p>
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+ * https://www.apache.org/licenses/LICENSE-2.0
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+ * <p>
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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+ * License for the specific language governing permissions and limitations under
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+ * the License.
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+ */
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+package com.baomidou.mybatisplus.extension.injector.methods;
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+
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+import com.baomidou.mybatisplus.annotation.IdType;
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+import com.baomidou.mybatisplus.core.enums.SqlMethod;
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+import com.baomidou.mybatisplus.core.injector.AbstractMethod;
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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.StringUtils;
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+import com.baomidou.mybatisplus.core.toolkit.sql.SqlScriptUtils;
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+import lombok.AllArgsConstructor;
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+import lombok.NoArgsConstructor;
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+import lombok.Setter;
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+import lombok.experimental.Accessors;
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+import org.apache.ibatis.executor.keygen.Jdbc3KeyGenerator;
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+import org.apache.ibatis.executor.keygen.KeyGenerator;
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+import org.apache.ibatis.executor.keygen.NoKeyGenerator;
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+import org.apache.ibatis.mapping.MappedStatement;
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+import org.apache.ibatis.mapping.SqlSource;
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+
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+import java.util.List;
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+import java.util.function.Predicate;
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+
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+/**
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+ * 批量新增数据,自选字段 insert
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+ * <p> 不同的数据库支持度不一样!!! 只在 mysql 下测试过!!! 只在 mysql 下测试过!!! 只在 mysql 下测试过!!! </p>
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+ * <p> 除了主键是 <strong> 数据库自增的未测试 </strong> 外理论上都可以使用!!! </p>
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+ * <p> 如果你使用自增有报错或主键值无法回写到entity,就不要跑来问为什么了,因为我也不知道!!! </p>
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+ * <p>
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+ * 自己的通用 mapper 如下使用:
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+ * <pre>
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+ * int insertBatchSomeColumn(List<T> entityList);
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+ * </pre>
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+ * </p>
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+ *
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+ * <li> 注意: 这是自选字段 insert !!,如果个别字段在 entity 里为 null 但是数据库中有配置默认值, insert 后数据库字段是为 null 而不是默认值 </li>
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+ *
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+ * <p>
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+ * 常用的 {@link Predicate}:
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+ * </p>
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+ *
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+ * <li> 例1: t -> !t.isLogicDelete() , 表示不要逻辑删除字段 </li>
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+ * <li> 例2: t -> !t.getProperty().equals("version") , 表示不要字段名为 version 的字段 </li>
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+ * <li> 例3: t -> t.getFieldFill() != FieldFill.UPDATE) , 表示不要填充策略为 UPDATE 的字段 </li>
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+ *
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+ * @author miemie
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+ * @since 2018-11-29
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+ */
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+@NoArgsConstructor
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+@AllArgsConstructor
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+public class InsertBatchSomeColumn extends AbstractMethod {
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+
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+ /**
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+ * 字段筛选条件
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+ */
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+ @Setter
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+ @Accessors(chain = true)
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+ private Predicate<TableFieldInfo> predicate;
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+
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+ @SuppressWarnings("Duplicates")
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+ @Override
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+ public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
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+ KeyGenerator keyGenerator = new NoKeyGenerator();
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+ SqlMethod sqlMethod = SqlMethod.INSERT_ONE;
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+ List<TableFieldInfo> fieldList = tableInfo.getFieldList();
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+ String insertSqlColumn = tableInfo.getKeyInsertSqlColumn(false) +
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+ this.filterTableFieldInfo(fieldList, predicate, TableFieldInfo::getInsertSqlColumn, EMPTY);
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+ String columnScript = LEFT_BRACKET + insertSqlColumn.substring(0, insertSqlColumn.length() - 1) + RIGHT_BRACKET;
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+ String insertSqlProperty = tableInfo.getKeyInsertSqlProperty(ENTITY_DOT, false) +
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+ this.filterTableFieldInfo(fieldList, predicate, i -> i.getInsertSqlProperty(ENTITY_DOT), EMPTY);
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+ insertSqlProperty = LEFT_BRACKET + insertSqlProperty.substring(0, insertSqlProperty.length() - 1) + RIGHT_BRACKET;
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+ String valuesScript = SqlScriptUtils.convertForeach(insertSqlProperty, "list", null, ENTITY, COMMA);
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+ String keyProperty = null;
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+ String keyColumn = null;
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+ // 表包含主键处理逻辑,如果不包含主键当普通字段处理
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+ if (StringUtils.isNotBlank(tableInfo.getKeyProperty())) {
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+ if (tableInfo.getIdType() == IdType.AUTO) {
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+ /* 自增主键 */
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+ keyGenerator = new Jdbc3KeyGenerator();
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+ keyProperty = tableInfo.getKeyProperty();
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+ keyColumn = tableInfo.getKeyColumn();
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+ } else {
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+ if (null != tableInfo.getKeySequence()) {
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+ keyGenerator = TableInfoHelper.genKeyGenerator(getMethod(sqlMethod), tableInfo, builderAssistant);
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+ keyProperty = tableInfo.getKeyProperty();
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+ keyColumn = tableInfo.getKeyColumn();
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+ }
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+ }
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+ }
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+ String sql = String.format(sqlMethod.getSql(), tableInfo.getTableName(), columnScript, valuesScript);
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+ SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
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+ return this.addInsertMappedStatement(mapperClass, modelClass, getMethod(sqlMethod), sqlSource, keyGenerator, keyProperty, keyColumn);
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+ }
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+
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+ @Override
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+ public String getMethod(SqlMethod sqlMethod) {
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+ // 自定义 mapper 方法名
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+ return "insertBatchSomeColumn";
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+ }
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+}
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