Question

我正在使用dropwizard jdbi和数据库postgresql：

@Mapper(StudentMapper.class)
  @SqlQuery("select user_registration.username,user_registration.user_email,user_registration.picname,"
            +"student_specific.subject_name from user_registration inner join "
            +"student_specific on user_registration.user_email=student_specific"
            +".student_email where (subject_name @> ARRAY[':subject'])"
            )
  StudentDetails searchStudents(@Bind("subject")String subject);

我的问题是当我给ARRAY ['maths']它会给出结果，但是当我给ARRAY ['：subject']时它返回null，似乎它不是绑定主题并且将'：subject'作为值请帮我解决如何通过：主题

Answer 1

您需要使用 @ UseStringTemplate3StatementLocator ，此注释允许我们在查询中使用<arg>语法。例如：

@UseStringTemplate3StatementLocator
public interface StudentDao {

      @Mapper(StudentMapper.class)
      @SqlQuery("select user_registration.username,user_registration.user_email,user_registration.picname,"
                +"student_specific.subject_name from user_registration inner join "
                +"student_specific on user_registration.user_email=student_specific"
                +".student_email where (subject_name @> ARRAY[<subject>])"
                )
      StudentDetails searchStudents(@BindIn("subject") List<String> subject);
}

您可能需要添加显式类型转换。

ARRAY[<subject>]::text[]

并转义::

ARRAY[<subject>]\\:\\:text[]

要使用StringTemplate，请将此依赖项添加到pom.xml

    <dependency>
        <groupId>org.antlr</groupId>
        <artifactId>stringtemplate</artifactId>
        <version>3.2.1</version>
    </dependency>

传递参数时出错

1 个答案: