SpringCloud的JPA连接PostgreSql的教程

项目目录结构

父build.gradle文件如下

spring-cloud-dependencies 和 spring-cloud-alibaba-dependencies 之间有版本对应关系的。 并不是可以随意搭配的。

具体版本对应关系参考：
版本关系

本想使用WebFlux模块的，奈何openfeign 不支持。

buildscript {
    ext {
        springBootVersion = '2.1.13.RELEASE'
        springBootManagementVersion = '1.0.8.RELEASE'
    }
    repositories {
        mavenLocal()
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        mavenCentral()
        maven { url 'https://repo.spring.io/snapshot' }
        maven { url 'https://repo.spring.io/milestone' }
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        classpath("io.spring.gradle:dependency-management-plugin:${springBootManagementVersion}")
    }
}

subprojects {
    apply plugin: "idea"
    apply plugin: "java"
    
    apply plugin: 'org.springframework.boot'
    apply plugin: "io.spring.dependency-management"

    sourceCompatibility = JavaVersion.VERSION_11
    targetCompatibility = JavaVersion.VERSION_11

    group "xyz.xiezc.mzix"
    version "1.0.0"

    repositories {
        mavenLocal()
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        mavenCentral()
        maven { url 'https://repo.spring.io/snapshot' }
        maven { url 'https://repo.spring.io/milestone' }
    }

    dependencies{
        compile group: 'cn.hutool', name: 'hutool-all', version: '5.6.6'
        compileOnly "org.projectlombok:lombok:1.18.20"

        compile 'com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-config'
        compile 'com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-discovery'

        compile 'org.springframework.boot:spring-boot-starter-actuator'
        compile 'org.springframework.boot:spring-boot-starter-aop'
        compile 'org.springframework.cloud:spring-cloud-starter-openfeign'

        annotationProcessor("org.projectlombok:lombok:1.18.20")
    }
    dependencyManagement {
        imports {
            mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Greenwich.SR6'
            mavenBom "com.alibaba.cloud:spring-cloud-alibaba-dependencies:2.1.4.RELEASE"
        }
    }
}

repositories {
    mavenLocal()
    maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
    mavenCentral()
    maven { url 'https://repo.spring.io/snapshot' }
    maven { url 'https://repo.spring.io/milestone' }
}

Schedule模块引入JPA相关配置

:hibernate-types-52 和 commons-lang3 两个模块需要引入。 不然PSql的jsonb 等类型的字段无法使用

dependencies {

    implementation project(":common")

    compile('org.springframework.boot:spring-boot-starter-data-redis-reactive')
    compile('org.springframework.boot:spring-boot-starter-web')


    implementation group: 'org.postgresql', name: 'postgresql', version: '42.2.20'
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'

    implementation 'org.apache.commons:commons-lang3:3.12.0'
    implementation 'com.vladmihalcea:hibernate-types-52:2.10.3'

    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
}

test {
    useJUnitPlatform()
}

对象的定义 基本 对象的定义：

json 类型的字段， 必须 @Type(type = “jsonb”) @Column(columnDefinition = “jsonb”) 同时定义。

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.vladmihalcea.hibernate.type.array.IntArrayType;
import com.vladmihalcea.hibernate.type.array.StringArrayType;
import com.vladmihalcea.hibernate.type.json.JsonBinaryType;
import com.vladmihalcea.hibernate.type.json.JsonNodeBinaryType;
import com.vladmihalcea.hibernate.type.json.JsonNodeStringType;
import com.vladmihalcea.hibernate.type.json.JsonStringType;
import lombok.Data;
import org.hibernate.annotations.*;

import javax.persistence.Column;
import javax.persistence.MappedSuperclass;
import java.time.LocalDateTime;
import java.util.Map;
/**
 * 数据库一些特殊类型 序列化方式 定义在底层 基类中 
 */
@TypeDefs({
        @TypeDef(name = "string-array", typeClass = StringArrayType.class),
        @TypeDef(name = "int-array", typeClass = IntArrayType.class),
        @TypeDef(name = "json", typeClass = JsonStringType.class),
        @TypeDef(name = "jsonb", typeClass = JsonBinaryType.class),
        @TypeDef(name = "jsonb-node", typeClass = JsonNodeBinaryType.class),
        @TypeDef(name = "json-node", typeClass = JsonNodeStringType.class),
})
@Data
@MappedSuperclass
public class BaseEntity {
    
    @Column
    @CreationTimestamp
    private LocalDateTime createTime;

    @Column
    @UpdateTimestamp
    private LocalDateTime updateTime;

    /**
     * 0: 是默认状态
     * -1: 是默认的删除状态
     */
    @Column
    private Integer status = 0;

    @Type(type = "jsonb")
    @Column(columnDefinition = "jsonb")
    private Map attribute;
}

表对象的定义：

Psql的schema 和 mysql的schema的略有不同。 @Table中必须指定schema

import lombok.Data;
import lombok.EqualsAndHashCode;
import org.hibernate.annotations.Type;

import javax.persistence.*;
import java.util.Map;

@Data
@EqualsAndHashCode(callSuper = true)
@Entity
@Table(name = "t_page", schema = "xiezc")
public class PageDO extends BaseEntity {

    /**
     * 页面的id
     */
    @Id
    @GeneratedValue
    Long id;

    @Column
    String code;

    @Column(unique = true)
    String url;

    @Column
    String contentType;

    @Type(type = "jsonb")
    @Column(columnDefinition = "jsonb")
    Map request;

    @Type(type = "jsonb")
    @Column(columnDefinition = "jsonb")
    Map response;
}

Repository 对象

@Repository
public interface PageRepository extends CrudRepository {

  List findByStatus(Integer status, Pageable pageable);

}

数据连接配置

## 数据库
spring.datasource.url=jdbc:postgresql://psotgres:5432/postgres
spring.datasource.username=xiezc
spring.datasource.password=1234567
spring.datasource.driverClassName=org.postgresql.Driver
spring.jpa.generate-ddl=true
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

数据库连接池等等

连接池等不用配置， 相关的包也可以不用引入， 默认使用的是 HikariPool 连接池。

后期 我句接入Druid 连接池，并配置完善的监控。

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