(How) can I use “LIKE” in SQL queries with MyBatis safely and DB-agnostic?

Question

In MyBatis, you mark the places where parameters should be inserted into your SQL like so:

SELECT * FROM Person WHERE id = #{id}

Answer 1

The bind feature is available with mybatis version 3.2 or greater. For versions below that:- The following worked for me, in Mysql. I have used the concat function.

<select id="getUserNamesAndEmails" parameterType="com.ashish.cardservices.models.UserCreds" resultMap="userCreds">
        select name,email from users where upper(name) like concat("%",concat(upper(#{searchQuery}),"%")) or upper(email) like concat("%",concat(upper(#{searchQuery}),"%")) and upper(email) != upper(#{email}) ;
</select>

Answer 2

the bind include inside the if

<select id="select" parameterType="java.util.Map" resultType="ViajeDTO">

SELECT A.ID_VIAJE ID, A.NOMBRE, A.DESCRIPCION, A.FINICIO, A.FFIN, A.LOGO, A.URL, 
        A.ID_CLIENTE IDCLIENTE, B.NOMBRE CLIENTE
FROM VIAJE A
INNER JOIN CLIENTE B ON (A.ID_CLIENTE = B.ID_CLIENTE)
WHERE A.ESTATUS = 1 

<if test="P_NOMBRE != null">
    <bind name="pattern" value="'%' + P_NOMBRE + '%'" />
      AND A.NOMBRE LIKE #{pattern}
</if>
</select>

Answer 3

We can make use of Bind. The bind element lets you create a variable out of an expression and bind it to the context. For example:

<select id="select" parameterType="java.util.Map" resultType="ViajeDTO">

    <bind name="pattern" value="'%' + P_NOMBRE + '%'" />

    SELECT A.ID_VIAJE ID, A.NOMBRE, A.DESCRIPCION, A.FINICIO, A.FFIN, A.LOGO, A.URL, 
            A.ID_CLIENTE IDCLIENTE, B.NOMBRE CLIENTE
    FROM VIAJE A
    INNER JOIN CLIENTE B ON (A.ID_CLIENTE = B.ID_CLIENTE)
    WHERE A.ESTATUS = 1 

    <if test="P_NOMBRE != null">
        AND A.NOMBRE LIKE #{pattern}
    </if>
</select>

Taking into account that the parameter to look for is P_NAME.