MyBatis Null Handling: Dynamic SQL IF Tag

1 year ago
Jackson Davis
1 minute

In MyBatis, you can use the if tag to handle null values. This tag allows you to check if a parameter is empty and execute the corresponding SQL statement based on the condition. For example:

<select id="getUserById" parameterType="int" resultType="User">
    SELECT * FROM user
    WHERE id = #{id}
    <if test="name != null">
        AND name = #{name}
    </if>
</select>

In the example above, the if tag is used to check if the name is empty. If the name is not empty, the condition AND name = #{name} will be added to the SQL statement. This allows for the dynamic construction of SQL statements, enabling different query operations to be executed based on different parameters.

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