01.08.2020»»суббота

Mybatis Batch Insert With Generated Key

01.08.2020
Mybatis Batch Insert With Generated Key Average ratng: 7,5/10 634 votes

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

  1. Mybatis Batch Insert Example
  2. Mybatis Batch Insert Return Id
  3. Mybatis Batch Insert With Generated Keys

If there is data in a single line, modify it or add it if there is no data The table creation statement of this case is: - auto-generated definition create table contacttype ( sid varchar(50) not null primary key, name varchar(50) default ' null, Status int default 1 null comment 'status, default 1 means valid,.

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 Batch Insert Example

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:

Mybatis Batch Insert With Generated Key

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:

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

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Mybatis Batch Insert Return Id

idstr
1A
1B

Mybatis Batch Insert With Generated Keys

to the following java object,

the result map should look as follows.