Spring boot2 JPA 命名策略用于 SQLite

Question

我想用CrudRepository实现Spring boot 2应用程序。我无法弄清楚我的应用程序中的命名策略是怎么回事。当我调用存储库中的方法(例如 findAll((时，它会转换数据库中表的名称，并且查询崩溃。 当然，我尝试了类似问题的解决方案： 改进的命名策略在Hibernate 5中不再有效 休眠命名策略更改表名

spring boot 2.1.8 (spring-boot-starter-data-jpa)

Spring 引导完全忽略 application.properties 文件中的命名策略属性(其他属性运行良好(

在 Spring boot 2.1.8 的源代码中，我找到了策略道具的名称并将它们复制到属性中：

物理和隐式策略实现的完全限定类名可以通过分别设置spring.jpa.hibernate.naming.physical-strategy和spring.jpa.hibernate.naming.implicit-strategy属性来配置。 或者，如果应用程序上下文中有ImplicitNamingStrategy或PhysicalNamingStrategy个 bean，则 Hibernate 将自动配置为使用它们。但它不起作用。

谢谢。

应用程序属性

spring.application.name=file parser
driverClassName=org.sqlite.JDBC
url=jdbc:sqlite:C:\Java\ParseSite\sample.db
user=admin
pass=123
#nothing works
spring.jpa.hibernate.naming.implicit-strategy=ru.laz.db.ImplicitNamingStrategyImpl
spring.jpa.hibernate.naming.physical-strategy=ru.laz.db.PhysicalNamingStrategyImpl
spring.jpa.properties.hibernate.physical_naming_strategy = ru.laz.db.PhysicalNamingStrategyImpl
spring.jpa.properties.hibernate.dialect = ru.laz.db.SQLitePrefs.SQLiteDialect

绒球.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<properties>
<spring.boot.version>2.1.8.RELEASE</spring.boot.version>
<java.version>1.8</java.version>
</properties>
<groupId>ru.laz</groupId>
<artifactId>parse-site</artifactId>
<version>0.1.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>${spring.boot.version}</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<dependency>
<groupId>org.asynchttpclient</groupId>
<artifactId>async-http-client</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.11.3</version>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.16.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.10</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

新闻区块回购.java

@Repository
public interface NewsBlockRepo extends CrudRepository<NewsBlock,Integer> {
//only this method works ok
@Modifying
@Transactional
@Query(value = "insert or replace into news_blocks (date, title, url, body, sent) values (:date, :title, :url, :body, :sent)", nativeQuery = true)
void insertOrIgnore(@Param("date") String date, @Param("title") String title, @Param("url") String url, @Param("body") String body, @Param("sent") int sent);
}

新闻块.java

package ru.laz.db;

import javax.persistence.*;
@Entity
@Table(name = "news_blocks")
public class NewsBlock {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@Column(name = "date")
private String date = "";//for unique constaint in sqlite
@Column(name = "title")
private String title = "";
@Column(name = "url")
private String url = "";
@Column(name = "body")
private String body = "";
@Column(name = "sent")
private int sent = 0;
public long getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public int getSent() {
return sent;
}
public void setSent(int sent) {
this.sent = sent;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof NewsBlock)) {
return false;
}
NewsBlock nb = (NewsBlock) o;
return this.url.equals(nb.getUrl()) && this.title.equals(nb.getTitle()) && this.body.equals(nb.getBody() );
}
@Override
public String toString() {
return "date: " + date + " title: "+title + " url: " + url + " text: " + body;
}
}

我的物理命名策略

public class PhysicalNamingStrategyImpl extends PhysicalNamingStrategyStandardImpl implements Serializable {
public static final PhysicalNamingStrategyImpl INSTANCE = new PhysicalNamingStrategyImpl();
@Override
public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment context) {
String nameModified = name.getText();
// Do whatever you want with the name modification
return new Identifier(nameModified, name.isQuoted());
}
}

甚至隐式命名策略

public class ImplicitNamingStrategyImpl extends ImplicitNamingStrategyJpaCompliantImpl {
@Override
protected Identifier toIdentifier(String stringForm, MetadataBuildingContext buildingContext) {
return super.toIdentifier(stringForm, buildingContext);
}
}

最终控制器从存储库调用方法

@RequestMapping("/getUnsent")
public String getUnsent() throws Exception {
return objectMapper.writeValueAsString(newsBlockRepo.findAll());
}

错误：

org.sqlite.SQLiteException: [SQLITE_ERROR] SQL error or missing database (no such column: newsblock0_.id)

Answer 1

错误no such column: newsblock0_.id。显然，它在news_block块表中说，没有id这意味着，spring-boot 被认为是您的 Entity 类中的id，因为您声明了它。实体类或多或少等于您的表。

它期望您声明的所有变量都必须在表中，但有时您声明的变量不需要在表中。所以你应该表示@Transient.

@Transient注释用于指示字段不会保留在数据库中。