Plus saveBatch method usage and introduction
MyBatis Plus is a popular library in the Java ecosystem. It extends the functions of MyBatis, a persistence framework that simplifies database operations in Java applications. In database operations, saving multiple records in batches is a common task. MyBatis Plus provides support for batch operations, including batch save.
Let's analyze how batch saving works in MyBatis Plus and learn more about its implementation in the source code:
1. Batch save method in MyBatis Plus:
In MyBatis Plus, batch saves are usually performed using the `IService` interface or the `BaseMapper` method provided by the `BaseMapper` interface. This method allows you to batch save a collection of entities.
For example, if you have a list of entities of type `User`, you can batch save them like this:
List<User> userList = ... // User entity list(userList);
2. Source code analysis:
To understand how `saveBatch` is implemented internally, we can check out the source code of MyBatis Plus. The following is a simplified analysis of its implementation process:
a. Interface definition:
First, let's take a look at how to define the `saveBatch` method in the `BaseMapper` interface:
public interface BaseMapper<T> extends Mapper<T> {
// Other methods...
int saveBatch(@Param("list") Collection<T> entityList);
}b. Implementation:
The actual implementation of the `saveBatch` method may vary slightly depending on the specific database dialect (MySQL, PostgreSQL, etc.). But the basic steps are similar:
1. Preparation: MyBatis Plus prepares batch insert SQL statements.
2. Batch Execution: Prepared SQL statements are executed in batch mode, which allows efficient insertion of multiple records in a single operation.
3. Error handling: MyBatis Plus handles possible errors and exceptions during batch insertion.
4. Return value: This method usually returns the number of records affected by batch insertion.
c. SQL Generation:
MyBatis Plus uses its internal SQL generation mechanism to generate appropriate batch insert SQL statements based on the database dialect used.
The difference between Plus' saveBatch method and insert intoSQL statement:
1. Abstraction degree:
- `insert into` is a SQL statement that directly operates on database tables. It requires manual writing of SQL statements to specify the fields to be inserted and the corresponding value.
- `saveBatch` is an advanced abstract method provided by MyBatis Plus for batch insertion of entity objects. It hides the underlying SQL statement generation details and simplifies the code writing process.
2. Usage:
- Using `insert into` requires manually building SQL statements, and it is necessary to deal with problems such as splicing of parameter values, SQL injection, etc.
- Using `saveBatch` does not require writing SQL statements, you only need to call the corresponding method and pass in the collection of entity objects to complete the batch insertion operation. MyBatis Plus automatically generates appropriate SQL statements and executes them.
3. Performance and efficiency:
- Manually written `insert into` SQL statements may have performance problems when inserting large amounts of data in batches, especially when the amount of data is large.
- The `saveBatch` method usually generates efficient batch insert SQL statements for different database types, and MyBatis Plus optimizes the execution process internally, so it is usually more efficient than manually written SQL statements.
4. Convenience and ease of use:
- Using the `saveBatch` method can more easily handle batch insert operations, with less code volume, and is easy to maintain and understand.
- Manually writing SQL statements may increase code complexity and require some details to be considered, such as field splicing, parameter values escaping, etc.
To sum up, the `saveBatch` method is more abstract, convenient and efficient than using the `insert into` SQL statement directly. It is a more recommended batch insertion method, especially when using persistent layer frameworks such as MyBatis Plus.
In short, MyBatis Plus simplifies batch saving of entities by providing the `saveBatch` method, and internally handles the preparation and execution of batch insert statements. This allows efficient insertion of multiple records into the database in a single operation, improving performance compared to single insertion.
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