SelectKey · mybatis源码解析

~~~ /** * Copyright 2009-2019 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 org.apache.ibatis.annotations; import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import org.apache.ibatis.mapping.StatementType; /** * The annotation that specify an SQL for retrieving a key value. * * * How to use: * <pre> * public interface UserMapper { * @SelectKey(statement = "SELECT identity('users')", keyProperty = "id", before = true, resultType = int.class) * @Insert("INSERT INTO users (id, name) VALUES(#{id}, #{name})") * boolean insert(User user); * } * </pre> * @author Clinton Begin */ @Documented @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface SelectKey { /** * Returns an SQL for retrieving a key value. * * @return an SQL for retrieving a key value */ String[] statement(); /** * Returns property names that holds a key value. * * If you specify multiple property, please separate using comma(','). * * * @return property names that separate with comma(',') */ String keyProperty(); /** * Returns column names that retrieves a key value. * * If you specify multiple column, please separate using comma(','). * * * @return column names that separate with comma(',') */ String keyColumn() default ""; /** * Returns whether retrieves a key value before executing insert/update statement. * * @return {@code true} if execute before; {@code false} if otherwise */ boolean before(); /** * Returns the key value type. * * @return the key value type */ Class<?> resultType(); /** * Returns the statement type to use. * * @return the statement type */ StatementType statementType() default StatementType.PREPARED; } ~~~