SpringBoot+jpa/mybatis+postgrepsql 实现 Postgresql数据查询
1.加入jar包
org.springframework.boot
spring-boot-starter-data-jpa
org.postgresql
postgresql
runtime
2’配置application.yml文件
spring:
datasource:
url: jdbc:postgresql://localhost:5432/gupaodb
username: root
password: 123456
driverClassName: org.postgresql.Driver
jpa:
show_sql: true
hibernate:
ddl-auto: none # none: 关闭hibernate的自动创建表结构的机制 DDL 级别 (create, create-drop, validate, update)
properties:
hibernate:
dialect: org.hibernate.dialect.PostgreSQLDialect
format_sql: true
temp:
# 兼容SpringBoot2.X, 关闭 Hibernate尝试验证PostgreSQL的CLOB特性
use_jdbc_metadata_defaults: false
3、创建entity类
package com.gupao.springkafkademo.entity;
import javax.persistence.*;
@Entity(name = "Company")//名字
@Table(name = "Company")//对应数据库表中名字
public class Company {
@Id//数据库中主键标识
@GeneratedValue//自增标识
private int id;
@Column(name = "name")//name属性为表的字段别名
private String name;
@Column(name = "age")
private int age;
@Column(name = "address")
private String address;
@Column(name = "salary")
private float salary;
public Company() {
}
public Company(int id, String name, int age, String address, float salary) {
this.id = id;
this.name = name;
this.age = age;
this.address = address;
this.salary = salary;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public float getSalary() {
return salary;
}
public void setSalary(float salary) {
this.salary = salary;
}
}
4、创建Respository
package com.gupao.springkafkademo.repository;
import com.gupao.springkafkademo.entity.Company;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.stereotype.Repository;
import javax.transaction.Transactional;
import java.util.List;
@Repository
public interface CompanyRepository
extends PagingAndSortingRepository
{
@Query(value = "select * from company",nativeQuery = true)
List GetAllCompanyData();
//根据id查询用户
@Query(value = "SELECT * FROM company WHERE id=?",
nativeQuery = true)
Company findCompanyById(int id);
//根据name查询用户
@Query(value = "SELECT * FROM company WHERE name=?",
nativeQuery = true)
public List getCompanyByName(String name);
//修改用户
@Query(value = "UPDATE company SET address=:#{#company.address} WHERE id=:#{#company.id}"
, nativeQuery = true)
@Modifying
@Transactional
int updateCompanyById(Company company);
//删除用户
@Modifying
@Transactional
@Query(value = "delete from company where id=?", nativeQuery =
true)
int deleteCompanyById(int id);
//增加用户
@Query(value = "insert into company(name,address)" +
" values(:#{#company.name},:#{#company.address})",
nativeQuery =
true)
int addCompany(Company company);
//分页查询
@Query(value = "select id,name,address from " +
"company limit ?1 offset ?2", nativeQuery = true)
List getPage(int pageSize, int pageNumber);
//获取记录总数
@Query(value = "SELECT \"count\"(*) from company",
nativeQuery = true)
int getAccount();
}
@Service
public class CompanyService {
@Autowired
private CompanyRepository companyRepository;
public List GetAllCompanyData(){
return companyRepository.GetAllCompanyData();
}
}
5、我所遇到的坑，一直报这个错，虽然不影响使用，但是膈应人，难受
PgSQL-JDBC:"org.postgresql.jdbc.PgConnection.createClob() 方法尚未被实作"
网上搜索设置方法，全都不好使，
# jpa:
# properties:
# hibernate:
# temp:
# # 兼容SpringBoot2.X, 关闭 Hibernate尝试验证PostgreSQL的CLOB特性
# use_jdbc_metadata_defaults: false
# jdbc:
# lob:
# non_contextual_creation: true
改投 springboot+mybatis+postgresql
1、加jar包
org.mybatis.spring.boot mybatis-spring-boot-starter 1.1.1 org.postgresql postgresql 42.2.11 runtime
2、配置yml
spring:
datasource:
platform: postgres
url: jdbc:postgresql://127.0.0.1:5432/gupaodb
username: postgres
password: 123456
driverClassName: org.postgresql.Driver
mybatis: # 坑死我点之一 mybatis是跟spring一个级别的 mapper-locations: classpath:mapper/*Mapper.xml # 坑死我点之二 Mapper.xml 必须在classpath之下，不想讲理论， type-aliases-package: com.gupao.springkafkademo.entity # 坑死我点之三 这是实体entity对应的文件夹
#坑死我点四：
* mapper.java文件，要用@Mapper注解，不需要在在启动时候写加入包扫描了，用@Resposity的，要扫描
3 、实体
package com.gupao.springkafkademo.entity;
import java.io.Serializable;
public class Employee implements Serializable {
private int id;
private String name;
private int age;
public Employee() {
}
public Employee(int id, String name, int age) {
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
4、javamapper
package com.gupao.springkafkademo.mapper;
import com.gupao.springkafkademo.entity.Employee;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
import java.util.Map;
@Mapper
public interface EmployeeMapper{
public List findALL();
public int getSize();
public int insertEmployee(Employee employee);
public int updateEmployee(Employee employee);
public Employee queryById(int id);
}
5、mapper.xml
id,name,age update employee set name = #{name} where id = #{id} INSERT INTO employee(id,name,age) VALUES (#{id},#{name},#{age})
烦死，破玩意，看了简单，一堆堆细节地方