如果我的EmployeeEntity包含多个字段:
first_name
last_name
department
office_name
state,
etc..
有没有一种方法可以让我的CRUDRepository接口中只有一个find ...()接口,可以根据查询参数搜索雇员而无需对该接口进行硬编码?
http://localhost:8080/employees?last_name='me'&state='tx'
或
http://localhost:8080/employee?state='tx'&office_name='alpha'
答案 0 :(得分:1)
您可以使用QueryDSL根据您的实体字段在存储库中动态生成任何查询。
要将其与Spring Data JPA集成,请在项目中添加以下两个依赖项和JPA注释处理器:
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-apt</artifactId>
<version>4.1.4</version>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-jpa</artifactId>
<version>4.1.4</version>
</dependency>
<plugin>
<groupId>com.mysema.maven</groupId>
<artifactId>apt-maven-plugin</artifactId>
<version>1.1.3</version>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<configuration>
<outputDirectory>target/generated-sources/java</outputDirectory>
<processor>com.mysema.query.apt.jpa.JPAAnnotationProcessor</processor>
</configuration>
</execution>
</executions>
</plugin>
...并以这种方式扩展您的存储库:
public interface EmployeeRepository extends JpaRepository<EmployeeEntity, Long>,
QuerydslPredicateExecutor<EmployeeEntity>, QuerydslBinderCustomizer<QEmployeeEntity> {
}
现在,您可以表达所有类型的查询组合:
BooleanExpression name = QEmployeeEntity.employeeEntity.last_name.eq("brawn");
BooleanExpression stateAndName = QEmployeeEntity.employeeEntity.state.eq("tx").and(name);
也请咨询 Spring Data JPA reference manual以获取更多功能。