JPA使用

JPA复合主键使用

1. 实体类(存在多个主键)

import lombok.Data;

import javax.persistence.*;
import java.io.Serializable;

@Data
@Table(name = YGGX.TABLE_NAME)
@Entity
@IdClass(com.southgis.ibase.entity.YGGX.class)
public class YGGX implements Serializable {
    public static final String TABLE_NAME = "YGGX";
    @Id
    @Column(name = "STID1")
    private String STID1;

    @Id
    @Column(name = "STID2")
    private String STID2;

    @Column(name = "GX")
    private String GX;
}

2. 需要一个中间类

import lombok.Data;

import java.io.Serializable;

@Data
public class YGGXInfo implements Serializable{
    private String STID1;
    private String STID2;
}

3. Dao层

import com.southgis.ibase.entity.YGGX;
import com.southgis.ibase.test.YGGXInfo;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.stereotype.Repository;

@Repository(IYggxDao.DAO_BEAN_NAME)
public interface IYggxDao extends JpaRepository<YGGX,YGGXInfo>, JpaSpecificationExecutor<YGGX>{
    public static final String DAO_BEAN_NAME = "yggxDao";
}

大字段使用

import org.hibernate.annotations.Type;
import javax.persistence.Lob;

/**
     * 图片转base64存储
     */
    @Type(type = "org.hibernate.type.TextType")
    @Lob
    @Column(name="BASEURL")
    @Comment("图片转base64存储")
    private String baseUrl;

动态查询

分页排序动态查询示例

import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;


		page = (null == page || page < 1) ? 0 : (page - 1);
        rows = (null == rows || rows <= 0) ? 5 : rows;
        Sort sort = Sort.by(Sort.Direction.ASC,"sort");
        PageRequest pageRequest = PageRequest.of(page,rows,sort);

        Specification<MapLibConfig> specification = new Specification<MapLibConfig>() {
            @Override
            public Predicate toPredicate(Root<MapLibConfig> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
                List<Predicate> predicatesList = new ArrayList<>();
                if(!CheckUtil.isNullorEmpty(name)){
                    final String nameTemp = "%" + name + "%";
                    Predicate namePredicate = criteriaBuilder.like(root.get("name"),nameTemp);
                    predicatesList.add(namePredicate);
                }
                if(!CheckUtil.isNullorEmpty(ridListTemp)){
                    Predicate ridsPredicate = root.get("libRid").in(ridListTemp);
                    predicatesList.add(ridsPredicate);
                }
                Predicate[] predicates = new Predicate[predicatesList.size()];
                return criteriaBuilder.and(predicatesList.toArray(predicates));
            }
        };
        Page<MapLibConfig> pageTemp = mapLibConfigDao.findAll(specification,pageRequest);

条件拼接

//root填充的key == 实体类属性名

1. 模糊查询

final String nameTemp = "%" + name + "%";
Predicate namePredicate = criteriaBuilder.like(root.get("name"),nameTemp);

2. in查询

List<String> ridListTemp = new ArrayList();
Predicate ridsPredicate = root.get("libRid").in(ridListTemp);

Date格式化成字符串

import com.fasterxml.jackson.annotation.JsonFormat;

/***
 * 创建时间
 */
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date createTime;