Sharing optimization tips for batch Insert statements in MyBatis
Feb 22, 2024 pm 04:51 PM
MyBatis is a popular Java persistence layer framework that implements the mapping of SQL and Java methods through XML or annotations, and provides many convenient functions for operating databases. In actual development, sometimes a large amount of data needs to be inserted into the database in batches. Therefore, how to optimize batch Insert statements in MyBatis has become an important issue. This article will share some optimization tips and provide specific code examples.
1. Use Batch Executor
MyBatis provides Batch Executor to support batch operations. Through Batch Executor, multiple SQL statements can be sent to the database for execution in batches, thereby reducing the interaction with the database. communication times and improve performance.
SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH);
try {
Mapper mapper = sqlSession.getMapper(Mapper.class);
for (Object obj : list) {
mapper.insertData(obj);
}
sqlSession.commit();
} finally {
sqlSession.close();
}2. Use the foreach tag to insert data in batches
In the XML configuration file of MyBatis, you can use the foreach tag to insert data in batches.
<insert id="batchInsert" parameterType="java.util.List">
INSERT INTO table_name (column1, column2)
VALUES
<foreach collection="list" item="item" separator="," >
(#{item.value1}, #{item.value2})
</foreach>
</insert>3. Use the batch insert method provided by MyBatis
MyBatis provides the insert method of org.apache.ibatis.session.SqlSession, Supports batch insertion of data.
List<Object> list = new ArrayList<>();
// 添加數(shù)據(jù)到 list 中
SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.SIMPLE);
try {
int batchSize = 1000;
int batchCount = list.size() / batchSize;
Mapper mapper = sqlSession.getMapper(Mapper.class);
for (int i = 0; i < batchCount; i++) {
List<Object> batchList = list.subList(i * batchSize, (i + 1) * batchSize);
mapper.batchInsert(batchList);
}
sqlSession.commit();
} finally {
sqlSession.close();
}4. Data preprocessing before batch insertion
Before performing batch insertion operations, you can preprocess the data, such as processing in batches, setting an appropriate batch size, etc., to Improve insertion efficiency.
Summary
Through the above methods, you can insert data in batches and optimize performance in MyBatis. Choosing the appropriate method depends on the specific business scenario and the amount of data. In actual development, you can choose the most suitable method to perform batch insertion operations according to your needs, thereby improving system performance and efficiency.
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