Question

我正在使用Spring Boot和PostgreSQL数据库。我有这个实体类：

@Entity
@Table(name = "TEST")

public class Test {
@Id
@GeneratedValue
private Long id;
}

这是我的application.properties文件：

spring.datasource.url = jdbc:postgresql://localhost:5432/postgres
spring.datasource.username = postgres
spring.datasource.password = 1234
spring.jpa.hibernate.ddl-auto= update
spring.jpa.properties.hibernate.dialect = 
org.hibernate.dialect.PostgreSQL94Dialect

它创建表，但表的名称为test（小写）。如何使其大写？

这是我的pom.xml文件：

<?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>

<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>demo</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <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.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>

编辑

用Maven安装项目时，出现以下错误（清理，安装）：

java.lang.reflect.InvocationTargetException: null at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171] at .................................... Caused by: java.sql.SQLFeatureNotSupportedException: Method org.postgresql.jdbc.PgConnection.createClob() is not yet implemented at org.postgresql.Driver.notImplemented(Driver.java:688) ~[postgresql-42.2.4.jar:42.2.4] at org.postgresql.jdbc.PgConnection.createClob(PgConnection.java:1269) ~[postgresql-42.2.4.jar:42.2.4] ... 70 common frames omitted

与之相关吗？

Answer 1

您应该尝试以下方法：

1）如此添加到应用程序application.properties spring.jpa.hibernate.naming.physical：

spring.datasource.url = jdbc:postgresql://localhost:5432/postgres
spring.datasource.username = postgres
spring.datasource.password = 1234
spring.jpa.hibernate.ddl-auto= update
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQL94Dialect
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

2）或尝试将org.hibernate.dialect.PostgreSQL94Dialect更改为org.hibernate.dialect.PostgreSQLDialect

spring.datasource.url = jdbc:postgresql://localhost:5432/postgres
spring.datasource.username = postgres
spring.datasource.password = 1234
spring.jpa.hibernate.ddl-auto= update
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect

有关更多信息，您应该看到this或this

Answer 2

尝试一下：

@Table(name = "\"TEST\"")

在postgres中：

引用标识符也使其区分大小写，而未引用名称总是折叠为小写。例如，标识符 PostgreSQL认为FOO，foo和“ foo”相同，但是“ Foo” 和“ FOO”彼此不同。（折叠 PostgreSQL中无引号的小写字母名称与 SQL标准，该标准指出未加引号的名称应折叠成大写案件。因此，foo应该等效于“ FOO”而不是“ foo” 标准。如果您想编写可移植的应用程序，那么您就是建议始终引用一个特定名称，或者永远不要引用它。）

来自文档https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html

Answer 3

尝试使用双引号将您的实体名称转义，如下所示：

@Entity
@Table(name = "\"TEST\"")
public class Test {
   @Id
   @GeneratedValue
   private Long id;
}

或

@Entity
@Table(name = "TEST")
public class Test implements Serializable {
   @Id
   @GeneratedValue
   private Long id;
}

Spring Boot：使用小写字母创建的表

3 个答案: