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@@ -0,0 +1,17 @@
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+package com.mooctest.crowd.domain.dao;
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+
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+import com.mooctest.crowd.domain.model.ExpertPO;
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+import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
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+import org.springframework.data.repository.CrudRepository;
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+
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+import javax.transaction.Transactional;
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+import java.util.List;
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+import java.util.Optional;
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+
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+@Transactional
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+public interface ExpertDao extends CrudRepository<ExpertPO, Long>, JpaSpecificationExecutor<ExpertPO> {
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+
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+ Optional<ExpertPO> findById(Long id);
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+
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+ List<ExpertPO> findAll();
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+}
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