How should date data be handled in MyBatis?

2 years ago
Sophia Anderson
2 minutes

In MyBatis, you can handle Date data by using the Java.util.Date type to represent the date. In the mapping file, you can insert Date type parameters using #{} or ${}.

To map Date data from a database to a Java object, you can use the following method:

  1. Inserting parameters of type Date using #{} syntax, for example:
  3. In this way, you can pass a Date type parameter to the selectById method in Java code.
  4. Use ${} to insert parameters of Date type, for example:
  6. In this way, in Java code, you can pass a Date type parameter to the selectByDate method using a string format.

When dealing with Date data in Java, you can choose to use either the java.util.Date class or the java.sql.Date class, depending on the data type in the database. If the data type in the database is DATE or TIMESTAMP, you can use the java.util.Date class. If the data type in the database is DATE, you can use the java.sql.Date class.

For example, if the “create_time” field in the database is of type TIMESTAMP, you can use the following method to handle it:

public class User {
  private int id;
  private Date createTime;

  // getters and setters
}

When retrieving data from the database, MyBatis automatically maps TIMESTAMP data from the database to Java’s Date type.

When inserting or updating data, the following methods can be used to handle Date type data:

  1. Insert Date type parameters using #{} syntax, for example:

  2. INSERT INTO user (create_time) VALUES (#{createTime})

    The following code inserts a user into the database with the specified creation time.

  3. In this way, Date type parameters can be passed to the insertUser method in Java code.
  4. Insert a parameter of type Date using {}. For example:

  5. INSERT INTO user (create_time) VALUES (‘${createTime}’)

    can be rephrased as:


    INSERT INTO the user table, with the value for create_time as ‘${createTime}’

  6. In this way, you can use a string format to pass a Date type parameter to the insertUser method in Java code.

The above are some common methods of handling Date type data in MyBatis, the specific approach depends on your requirements and the data type in the database.

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