mybatis foreach 但提交单独的插入

Question

以下 mybatis 映射适用于我们支持的所有数据库，但一个除外。这是因为该数据库不允许批量插入方法（Intersystems Cache）。因此，我想提交单独的插入语句而不是一个。我如何构造这个 mybatis 语句，以便它仍然从我的 java.util.List 中读取，但它执行多个插入？

  <insert id="bulkInsert" parameterType="java.util.List" >
    <foreach collection="list" item="resource" index="index">
      INSERT INTO ${prefix}ACT_APP_DEPLOYMENT_RESOURCE(ID_, NAME_, RESOURCE_BYTES_, DEPLOYMENT_ID_) VALUES
      (#{resource.id, jdbcType=VARCHAR},
      #{resource.name, jdbcType=VARCHAR},
      #{resource.bytes, jdbcType=${blobType}},
      #{resource.deploymentId, jdbcType=VARCHAR})
    </foreach>
  </insert>

Answer 1

如果您使用的是 java 版本 8+，您可以像这样在映射器中使用默认方法：

interface MyMapper {
    void insertResource(@Param("resource") MyResource resource);

    default void bulkInsert(List<MyResource> resources) {
         for(MyResource resource:resources) {
             insertResource(resource);
         }
    }
}

并修改映射器xml:

<insert id="insertResource">
    INSERT INTO ${prefix}ACT_APP_DEPLOYMENT_RESOURCE(ID_, NAME_, RESOURCE_BYTES_, DEPLOYMENT_ID_) VALUES
    (#{resource.id, jdbcType=VARCHAR},
    #{resource.name, jdbcType=VARCHAR},
    #{resource.bytes, jdbcType=${blobType}},
    #{resource.deploymentId, jdbcType=VARCHAR})
</insert>

Answer 2

首先，检查。

另外根据mybatis doc：

The one parameter that might be new to you is ExecutorType. This enumeration defines 3 values:

ExecutorType.SIMPLE: This type of executor does nothing special. It creates a new PreparedStatement for each execution of a statement.

ExecutorType.REUSE: This type of executor will reuse PreparedStatements.

ExecutorType.BATCH: This executor will batch all update statements and demarcate them as necessary if SELECTs are executed between them, to ensure an easy-to-understand behavior.

默认为ExecutorType.SIMPLE，您需要将其更改为ExecutorType.BATCH。

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