Mybatis Batch Insert With Generated Key

12.06.2020by

Executing Batch Inserts. Batch insert support in Spring is a bit different than batch support in MyBatis3 and Spring does not support returning generated keys from a batch insert. The following is a complete example of a batch insert (note the use of SqlParameterSourceUtils to create an array of parameter sources from an array of input records). MyBatis Generator with Batch insert in Postgres causes PSQLException: A result was returned when none was expected Hi, I'm using MyBatis generator to generate the xml mapping I can successfully query and perform single inserts but I'm getting an Exception when I attempt a batch insert.

  1. Mybatis Batch Insert With Generated Key Generator
  2. Mybatis Batch Insert For Mysql
  3. Mybatis Batch Insert
  4. Mybatis Batch Insert Return Id
  5. Mybatis Batch Insert With Generated Keyboard

What is the difference between #{..} and ${..}?

MyBatis interprets #{..} as a parameter marker in a JDBC prepared statement. MyBatis interprets ${..} as string substitution. It is important to know the difference because parameter markers cannot be used in certain places in SQL statements.
For example, you cannot use a parameter marker to specify a table name.
Given the following code:

MyBatis will generate the following prepared statement:

Important: note that use of ${..} (string substitution) presents a risk for SQL injection attacks. Also, string substitution can be problematical for complex types like dates. For these reasons, we recommend using the #{..} form whenever possible.

How do I code an SQL LIKE?

There are two methods. In the first (and preferred) method, you append the SQL wildcards in your Java code.
For example:

Alternatively, you can append '%' in XML mapper using <bind /> tag.

Another method is to concatenate the wildcards in your SQL. This method is less safe than the method above because of possible SQL injection.
For example:

Mybatis Batch Insert With Generated Key Generator

Important: Note the use of $ vs. # in the second example!

How do I code a batch insert?

First, code a simple insert statement like this:

Then execute a batch in Java code like this:

How can I retrieve the value of an auto generated key?

The insert method always returns an int - which is the number of rows inserted. Auto generated key values are placed into the parameter object and are available after the completion of the insert method.
For example:

How do I use multiple parameters in a mapper?

Java reflection does not provide a way to know the name of a method parameter so MyBatis names them by default like: param1, param2..
If you want to give them a name use the @param annotation this way:

Mybatis Batch Insert For Mysql

Now you can use them in your xml like follows:

How do I map a list of simple type objects (String, Integer, etc.) to a Bean or Map ?

To map the following results

idstr
1A
1B

to the following java object,

the result map should look as follows.

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Mybatis Batch Insert Return Id

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Comments

commented Jan 9, 2020

sql like
<insert .. >
insert into ..
values
..
on duplicate key
update foo=values(foo) ..

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when insert multiple new items, only this first item has primary key value in return
like:
{id=1,..},
{id=null,..},
{id=null,..}

version:mybatis-spring-boot-starter:2.0.0

commented Jan 11, 2020

@wuchenyv1990 ,

It is not a bug. It's just how the driver works [1].

I did some tests a while ago and my conclusion was:
If you need to get the generate keys from on duplicate key update statement, you need to execute one insert at a time.
Even batch operation (i.e. using ExecutorType.BATCH) may not work properly.

Closing as it's not a bug.

[1] https://github.com/mysql/mysql-connector-j/blob/fef2894d751d47223192b706977b4a5bc41e6be4/src/main/user-impl/java/com/mysql/cj/jdbc/StatementImpl.java#L1381-L1383
As the current OK_Packet does not provide enough information, it may require protocol improvement to support multiple generated keys correctly

closed this Jan 11, 2020

Mybatis Batch Insert With Generated Keyboard

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