一、Postgresql介绍

PostgreSQL是一种特性非常齐全的自由软件的对象-关系型数据库管理系统（ORDBMS），是以加州大学计算机系开发的POSTGRES，4.2版本为基础的对象关系型数据库管理系统。POSTGRES的许多领先概念只是在比较迟的时候才出现在商业网站数据库中。PostgreSQL支持大部分的SQL标准并且提供了很多其他现代特性，如复杂查询、外键、触发器、视图、事务完整性、多版本并发控制等。同样，PostgreSQL也可以用许多方法扩展，例如通过增加新的数据类型、函数、操作符、聚集函数、索引方法、过程语言等。另外，因为许可证的灵活，任何人都可以以任何目的免费使用、修改和分发PostgreSQL。

1.、 PostgostreSQL 稳定性很强，在崩溃等场景下抗打击能力特别强，对比mysql在电脑崩溃等情景下的丢失数据情况，PG数据库这方面要好一些。

2.、对比Mysql，PostgostreSQL支持的数据类型更多

3.、PostgostreSQL可以使用sql进行编程

4.、PG 的有多种集群架构可以选择，plproxy 可以支持语句级的镜像或分片，slony 可以进行字段级的同步设置，standby 可以构建WAL文件级或流式的读写分离集群，同步频率和集群策略调整方便，操作非常简单。

5.、PostgreSQL的可以使用函数和条件索引

6.、PG 的 TEXT 类型可以直接访问，SQL语法内置正则表达式，能够索引，还可以全文检索。用PG的话，文档数据库都可以省了。

7.、 PostgreSQL的性能很强，在高并发读写的场景下，PostgreSQL的性能指标依旧可以维持顶峰，相对比 MySQL 在同样的场景下会出现一个明显的下滑（mysql5.5之后，在企业级版本中有个插件可以改善很多，不过需要付费）。

二、Postgresql+Springboot yml基本使用

1.导入Maven

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>

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2.编写yml配置文件

spring:
  datasource:

    url: jdbc:postgresql://localhost:5432/postgres # url: jdbc:mysql://localhost:3306/tis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
    username: postgres
    password: 123456
    driverClassName: org.postgresql.Driver
  jackson:
    time-zone: GMT+8
  jpa:
    properties:
      open-in-view: true
      hibernate:
        show_sql: false
        format_sql: true
        dialect: org.hibernate.dialect.PostgreSQLDialect
        temp:
          use_jdbc_metadata_defaults: false
        hbm2ddl:
          auto: update
    database: postgresql

  rabbitmq:
    host: 192.168.90.205
    port: 5672
    username: admin
    password: admin
    virtual-host: /

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3.编写Entity实体类

package com.supcon.oms.entity;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import lombok.Data;
import javax.persistence.*;
import java.io.Serializable;
/**
* @author: zhaoxu
* @date: 2020/9/8 20:43
*/
@Data
@Entity
@Table(name = "t_tank", schema = "public", catalog = "")
@JsonIgnoreProperties(ignoreUnknown = true)
public class TTankEntity implements Serializable { 

private static final long serialVersionUID = 4718371560086576837L;
@Id
@Column(name="tank_id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer tankId;
@Basic
@Column(name = "tank_no", nullable = false, length = 255)
private String tankNo;
@Basic
@Column(name = "equipment_type", nullable = true, length = 255)
private String equipmentType;
@Basic
@Column(name = "tank_name", nullable = true, length = 255)
private String tankName;
@Basic
@Column(name = "tank_description", nullable = true, length = 1000)
private String tankDescription;
@Basic
@Column(name = "equipment_status", nullable = true, length = 255)
private String equipmentStatus;
@Basic
@Column(name = "tank_keepwarm", nullable = true, length = 100)
private String tankKeepwarm;
@Basic
@Column(name = "tank_status", nullable = true, length = 255)
private String tankStatus;
@Basic
@Column(name = "tank_farmid", nullable = true, length = 255)
private String tankFarmid;
@Basic
@Column(name = "tank_type", nullable = true, length = 255)
private String tankType;
@Basic
@Column(name = "tank_diameter", nullable = true, precision = 0)
private Double tankDiameter;
@Basic
@Column(name = "tank_height", nullable = true, precision = 0)
private Double tankHeight;
@Basic
@Column(name = "tank_capacity_standard", nullable = true, precision = 0)
private Double tankCapacityStandard;
@Basic
@Column(name = "liquid_level_temperature", nullable = true, precision = 0)
private Double liquidLevelTemperature;
@Basic
@Column(name = "tank_capacity_safe", nullable = true, precision = 0)
private Double tankCapacitySafe;
@Basic
@Column(name = "calculate_type", nullable = true, length = 255)
private String calculateType;
@Basic
@Column(name = "working_level_min", nullable = true, precision = 0)
private Double workingLevelMin;
@Basic
@Column(name = "working_level_max", nullable = true, precision = 0)
private Double workingLevelMax;    @Basic
@Column(name = "nominal_volume", nullable = true, precision = 0)
private Double nominalVolume;
@Basic
@Column(name = "thermal_expansion_system", nullable = true, length = 255)
private String thermalExpansionSystem;
@Basic
@Column(name = "floating_point_quality", nullable = true, length = 255)
private String floatingPointQuality;
@Basic
@Column(name = "level_change_dead", nullable = true, length = 100)
private String levelChangeDead;
@Basic
@Column(name = "alarm_events", nullable = true, length = 255)
private String alarmEvents;
@Basic
@Column(name = "tank_capacity_now", nullable = true, precision = 0)
private Double tankCapacityNow;
@Basic
@Column(name = "tank_quality", nullable = true, precision = 0)
private Double tankQuality;
@Basic
@Column(name = "tank_temperature", nullable = true, precision = 0)
private Double tankTemperature;
@Basic
@Column(name = "tank_pressure", nullable = true, precision = 0)
private Double tankPressure;
@Basic
@Column(name = "flow_speed", nullable = true, precision = 0)
private Double flowSpeed;
@Basic
@Column(name = "flow_amount", nullable = true, precision = 0)
private Double flowAmount;
@Basic
@Column(name = "remaining_space", nullable = true, precision = 0)
private Double remainingSpace;
@Basic
@Column(name = "vcf", nullable = true, precision = 0)
private Double vcf;
@Basic
@Column(name = "liquid_level_status", nullable = true, length = 255)
private String liquidLevelStatus;
@Basic
@Column(name = "net_standard_volume", nullable = true, precision = 0)
private Double netStandardVolume;
@Basic
@Column(name = "water_bottom_volume", nullable = true, precision = 0)
private Double waterBottomVolume;
@Basic
@Column(name = "tank_flow_inout", nullable = true, precision = 0)
private Double tankFlowInout;
@Basic
@Column(name = "usable_volume", nullable = true, precision = 0)
private Double usableVolume;
@Basic
@Column(name = "standard_quality_sum", nullable = true, precision = 0)
private Double standardQualitySum;
@Basic
@Column(name = "standard_quality_net", nullable = true, precision = 0)
private Double standardQualityNet;
@Basic
@Column(name = "working_volume_max", nullable = true, precision = 0)
private Double workingVolumeMax;
@Basic
@Column(name = "working_volume_min", nullable = true, precision = 0)
private Double workingVolumeMin;
@Basic
@Column(name = "liquid_level", nullable = true, precision = 0)
private Double liquidLevel;
@Basic
@Column(name = "physical_temperature", nullable = true, precision = 0)
private Double physicalTemperature;
@Basic
@Column(name = "ambient_temperature", nullable = true, precision = 0)
private Double ambientTemperature;
@Basic
@Column(name = "density_of_material", nullable = true, precision = 0)
private Double densityOfMaterial;
@Basic
@Column(name = "police_liquid_level", nullable = true, length = 255)
private String policeLiquidLevel;
@Basic
@Column(name = "police_temperature", nullable = true, length = 255)
private String policeTemperature;
@Basic
@Column(name = "police_liquid_switch", nullable = true, length = 255)
private String policeLiquidSwitch;
@Basic
@Column(name = "police_instrument_system", nullable = true, length = 255)
private String policeInstrumentSystem;
@Basic
@Column(name = "police_inout_volume", nullable = true, length = 255)
private String policeInoutVolume;
@Basic
@Column(name = "oms_source_target", nullable = true)
private Integer omsSourceTarget;
@Basic
@Column(name = "oms_share", nullable = true)
private Integer omsShare;
@Basic
@Column(name = "oms_share_depth", nullable = true)
private Integer omsShareDepth;
@Basic
@Column(name = "oms_occupy", nullable = true)
private Integer omsOccupy;
@Basic
@Column(name = "materiel_name", nullable = true, length = 255)
private String materielName;
@Basic
@Column(name = "materiel_type", nullable = true, length = 255)
private String materielType;
@Basic
@Column(name = "materiel_quality_attributes", nullable = true, length = 255)
private String materielQualityAttributes;
@Basic
@Column(name = "materiel_density", nullable = true, precision = 0)
private Double materielDensity;
}

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其他的按照正常的框架写就可以了，和mysql的使用方式基本上没有区别