MyBatis中动态SQL的使用指南

//Lombok
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class User implements Serializable {
    private Long id;            // 用户id
    private String username;    // 用户名
    private String password;    // 密码
    private String phone;       // 注册手机号
    private String info;        // 详细信息
    private Integer status;     // 使用状态（1正常 2冻结）
    private Integer balance;     // 账户余额
    private Date createTime;    // 创建时间
    private Date updateTime;    // 更新时间
}

<select id="findByConditions" resultType="com.lps.domain.User">
    SELECT * FROM user
    <where>
        <if test="username != null and username != ''">
            AND USERNAME LIKE CONCAT('%', #{username}, '%')
        </if>
        <if test="phone != null and phone != ''">
            AND PHONE LIKE CONCAT('%', #{phone}, '%')
        </if>
    </where>
</select>

<select id="findByIds" resultType="com.lps.domain.User">
    SELECT * FROM user WHERE id IN
    <foreach item="id" collection="idList" open="(" separator="," close=")">
        #{id}
    </foreach>
</select>

<update id="updateUser">
    UPDATE user
    <set>
        <if test="username != null">username = #{username},</if>
        <if test="phone != null">phone = #{phone},</if>
    </set>
    WHERE id = #{id}
</update>

<select id="findByStatus" resultType="com.lps.domain.User">
    SELECT * FROM user
    <where>
        <choose>
            <when test="status == 1">AND status = 1</when>
            <when test="status == 2">AND status = 2</when>
            <otherwise>AND status IS NULL</otherwise>
        </choose>
    </where>
</select>

<select id="findUsersWithTrim" resultType="com.lps.domain.User">
    SELECT * FROM user
    <trim prefix="WHERE" prefixOverrides="AND |OR ">
        <if test="username != null">AND username = #{username}</if>
        <if test="phone != null">AND phone = #{phone}</if>
        <if test="status != null">AND status = #{status}</if>
    </trim>
</select>

<select id="selectUserByLike" resultType="com.lps.domain.User">
    <bind name="username" value="'%' + username + '%'" />
    SELECT * FROM user
    WHERE username LIKE #{username}
</select>