Postgresql+Springboot yml基本使用

系统管理员 2022-12-10 10:13 143阅读 0赞

# 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>

## 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:
          hibernate:
            show_sql: true
            format_sql: true
            ddl-auto: update #框架会自动帮我们创建或更新表结构
    
      rabbitmq:
        host: 192.168.90.205
        port: 5672
        username: admin
        password: admin
        virtual-host: /

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;
    }

**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**