Spring应用程序没有在Postgres数据库上创建表

Posted

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Spring应用程序没有在Postgres数据库上创建表相关的知识，希望对你有一定的参考价值。

Spring不会在我的Postgres数据库中创建我的@Entity类中指定的表。

我在StackOverflow中尝试了很多解决方案，比如application.properties中的一些更改，更改方言，设置架构等。我已经检查了我的数据库权限以及用户/密码信息，这一切都很好。

application.properties: 
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
spring.datasource.url= jdbc:postgresql://localhost:5432/produtosapirest
spring.datasource.username=postgres
spring.datasource.password=postgres
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
pom.xml: 
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.produtos</groupId>
<artifactId>apirest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>apirest</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

Produto.java 
package produtos.api.models;

import java.io.Serializable;
import java.math.BigDecimal;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="TB_PRODUTO")
public class Produto implements Serializable{

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long id;

private String nome;
private BigDecimal quantidade;
private BigDecimal valor;

public long getId() {
    return id;
}
public void setId(long id) {
    this.id = id;
}
public String getNome() {
    return nome;
}
public void setNome(String nome) {
    this.nome = nome;
}
public BigDecimal getQuantidade() {
    return quantidade;
}
public void setQuantidade(BigDecimal quantidade) {
    this.quantidade = quantidade;
}
public BigDecimal getValor() {
    return valor;
}
public void setValor(BigDecimal valor) {
    this.valor = valor;
}

}

terminal: 
 :: Spring Boot ::        (v2.1.4.RELEASE)

2019-04-11 10:21:00.011  INFO 16132 --- [  restartedMain] com.produtos.apirest.ApirestApplication  : Starting ApirestApplication on venancio-MS-7817 with PID 16132 (/home/brenorios/eclipse-workspace/apirest/target/classes started by brenorios in /home/brenorios/eclipse-workspace/apirest)
2019-04-11 10:21:00.014  INFO 16132 --- [  restartedMain] com.produtos.apirest.ApirestApplication  : No active profile set, falling back to default profiles: default
2019-04-11 10:21:00.077  INFO 16132 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2019-04-11 10:21:00.077  INFO 16132 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2019-04-11 10:21:00.880  INFO 16132 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-04-11 10:21:00.901  INFO 16132 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 14ms. Found 0 repository interfaces.
2019-04-11 10:21:01.283  INFO 16132 --- [  restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$84f3c51d] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-04-11 10:21:01.672  INFO 16132 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2019-04-11 10:21:01.698  INFO 16132 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-04-11 10:21:01.698  INFO 16132 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.17]
2019-04-11 10:21:01.778  INFO 16132 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-04-11 10:21:01.778  INFO 16132 --- [  restartedMain] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1701 ms
2019-04-11 10:21:01.988  INFO 16132 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2019-04-11 10:21:02.137  INFO 16132 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2019-04-11 10:21:02.178  INFO 16132 --- [  restartedMain] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2019-04-11 10:21:02.226  INFO 16132 --- [  restartedMain] org.hibernate.Version                    : HHH000412: Hibernate Core {5.3.9.Final}
2019-04-11 10:21:02.227  INFO 16132 --- [  restartedMain] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2019-04-11 10:21:02.343  INFO 16132 --- [  restartedMain] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2019-04-11 10:21:02.455  INFO 16132 --- [  restartedMain] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL95Dialect
2019-04-11 10:21:02.659  INFO 16132 --- [  restartedMain] o.h.e.j.e.i.LobCreatorBuilderImpl        : HHH000421: Disabling contextual LOB creation as hibernate.jdbc.lob.non_contextual_creation is true
2019-04-11 10:21:02.663  INFO 16132 --- [  restartedMain] org.hibernate.type.BasicTypeRegistry     : HHH000270: Type registration [java.util.UUID] overrides previous : org.hibernate.type.UUIDBinaryType@3046a8a9
2019-04-11 10:21:02.834  INFO 16132 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2019-04-11 10:21:02.852  INFO 16132 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2019-04-11 10:21:03.042  INFO 16132 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-04-11 10:21:03.087  WARN 16132 --- [  restartedMain] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2019-04-11 10:21:03.347  INFO 16132 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2019-04-11 10:21:03.349  INFO 16132 --- [  restartedMain] com.produtos.apirest.ApirestApplication  : Started ApirestApplication in 3.783 seconds (JVM running for 4.149)
ApirestApplication.java: 
package com.produtos.apirest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ApirestApplication {

    public static void main(String[] args) {
        SpringApplication.run(ApirestApplication.class, args);
    }

}

基于我正在遵循的教程，此设置应该导致在postgres数据库中创建表，但它不会发生。

答案

我刚试过你的源代码，这里是日志：

2019-04-11 19:58:59.345  INFO 15520 --- [  restartedMain] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL95Dialect
2019-04-11 20:02:42.971  INFO 15520 --- [  restartedMain] o.h.e.j.e.i.LobCreatorBuilderImpl        : HHH000421: Disabling contextual LOB creation as hibernate.jdbc.lob.non_contextual_creation is true
2019-04-11 20:02:42.975  INFO 15520 --- [  restartedMain] org.hibernate.type.BasicTypeRegistry     : HHH000270: Type registration [java.util.UUID] overrides previous : org.hibernate.type.UUIDBinaryType@7893aaa9
2019-04-11 20:02:44.848  WARN 15520 --- [  restartedMain] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Warning Code: 0, SQLState: 00000
2019-04-11 20:02:44.848  WARN 15520 --- [  restartedMain] o.h.engine.jdbc.spi.SqlExceptionHelper   : CREATE TABLE / PRIMARY KEY will create implicit index "tb_produto_pkey" for table "tb_produto"
2019-04-11 20:02:44.850  INFO 15520 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2019-04-11 20:02:44.863  INFO 15520 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2019-04-11 20:02:45.067  INFO 15520 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-04-11 20:02:45.111  WARN 15520 --- [  restartedMain] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning

您可以看到该表是在实例20：02：44.848中创建的。这是在上一个日志的2分钟之后。检查是否设置了@EnableAutoConfiguration。我把它作为@SpringBootApplication的一部分启用了。

等到你看到打印的声明 - “完成---”通过改变你的Application.java：

package produtos.api;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public CommandLineRunner demo() {
        return (args) -> {
            System.out.println("Done---");
        };
    }
}
另一答案

你错过了Postgres方言。您可以尝试在属性/ yml文件中添加Postgres Dialect，如下所示：

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
另一答案

你的问题可能就在这里，

spring.jpa.hibernate.ddl-auto=update

如果您阅读有关此Here的更多信息，您可以确定，

例如，update操作将尝试添加新列，约束等，但永远不会删除先前可能已存在但不再作为先前运行的对象模型的一部分的列或约束。

所以我建议你根据自己的要求使用create或create-drop。

注意：

  1. create和create-drop将在每次运行应用程序时创建DB。因此，如果您不希望这种情况发生，请在创建数据库后将设置更改为update。
  2. 请勿在生产环境中使用此配置。
另一答案

我只是觉得这是一个愚蠢的错误。我的主包和模型包没有相同的名称结构，所以Spring没有得到我的模型包。

之前：com.produtosapirest2 com.produtosapi.models

之后：com.productsapirest2 com.produtosapirest2.models

以上是关于Spring应用程序没有在Postgres数据库上创建表的主要内容，如果未能解决你的问题，请参考以下文章

从 Spring Boot 连接到 Heroku Postgres

Spring Boot + Hibernate + Postgres - 不创建表

带有用户名和密码的 Zonky + Spring Boot + Postgres + Flyway

Spring Boot - MySQL 到 Postgres 的迁移

Spring Batch - 无法在 Postgres 上创建元数据表并将实际数据加载到 mysql

使用 Spring / JPA 写入 Postgres 数据库的 JSON 列