休眠不创建表，但没有错误消息 [英] hibernate not creating table but no error messages

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问题描述

我正在做一个spring-boot项目，并尝试用hibernate创建一个表，当我运行应用程序并且服务器正常启动时，我没有遇到任何错误，但表没有创建。



StatusUpdate.java 

  package model; 
 
 import java.util.Date; 
 
 import javax.persistence.Column; 
 import javax.persistence.Entity; 
 import javax.persistence.GeneratedValue; 
 import javax.persistence.GenerationType; 
 import javax.persistence.Id; 
 import javax.persistence.Table; 
 import javax.persistence.Temporal; 
 import javax.persistence.TemporalType; 
 import javax.persistence.PrePersist; 
 
 @Entity 
 @Table（name =status_update）
 public class StatusUpdate {
 
 @Id 
 @Column（name = id）
 @GeneratedValue（strategy = GenerationType.AUTO）
 private Long id; 
 
 @Column（name =text）
 private String text; 
 
 @Column（name =added）
 @Temporal（TemporalType.TIMESTAMP）
私人添加日期; 
 
 @PrePersist 
 protected void onCreate（）{
 if（added == null）{
 added = new Date（）; 
} 
} 
 
 public StatusUpdate（String text）{
 this.text = text; 
} 
 
 public StatusUpdate（String text，Date added）{
 this.text = text; 
 this.added = added; 
} 
 
 public Long getId（）{
 return id; 
} 
 
 public void setId（Long id）{
 this.id = id; 
} 
 
 public String getText（）{
 return text; 
} 
 
 public void setText（String text）{
 this.text = text; 
} 
 
 public Date getAdded（）{
 return added; 
} 
 
 public void setAdded（添加日期）{
 this.added = added; 
} 
 
 @Override 
 public int hashCode（）{
 final int prime = 31; 
 int result = 1; 
 result = prime * result +（（added == null）？0：added.hashCode（））; 
 result = prime * result +（（id == null）？0：id.hashCode（））; 
 result = prime * result +（（text == null）？0：text.hashCode（））; 
返回结果; 
 
 $ b @Override 
 public boolean equals（Object obj）{
 if（this == obj）
 return true; 
 if（obj == null）
 return false; 
 if（getClass（）！= obj.getClass（））
 return false; 
 StatusUpdate other =（StatusUpdate）obj; 
 if（added == null）{
 if（other.added！= null）
 return false; 
} else if（！added.equals（other.added））
 return false; 
 if（id == null）{
 if（other.id！= null）
 return false; 
} else if（！id.equals（other.id））
 return false; 
 if（text == null）{
 if（other.text！= null）
 return false; 
} else if（！text.equals（other.text））
 return false; 
返回true; 
} 
 
}

pom.xml 

 < project xmlns =http://maven.apache.org/POM/4.0.0xmlns：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> 1.4.0.RELEASE< / version> 
< / parent> 
 
<属性> 
< java.version> 1.8< /java.version> 
< tiles.version> 3.0.7< /tiles.version> 
< / properties> 
 
< groupId> com.voja< / groupId> 
< artifactId> spring-boot-tutorial< / artifactId> 
< version> 0.0.1-SNAPSHOT< / version> 
 
<依赖关系> 
< dependency> 
< groupId> org.springframework.boot< / groupId> 
< artifactId> spring-boot-starter-web< / artifactId> 
< /依赖关系> 
< dependency> 
< groupId> org.apache.tomcat.embed< / groupId> 
< artifactId> tomcat-embed-jasper< / artifactId> 
< /依赖关系> 
< dependency> 
< groupId> org.apache.tiles< / groupId> 
< artifactId> tiles-core< / artifactId> 
< version> $ {tiles.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.apache.tiles< / groupId> 
< artifactId> tiles-jsp< / artifactId> 
< version> $ {tiles.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> javax.servlet< / groupId> 
< artifactId> jstl< / artifactId> 
< /依赖关系> 
< dependency> 
< groupId> org.springframework.boot< / groupId> 
< artifactId> spring-boot-devtools< / artifactId> 
< /依赖关系> 
< dependency> 
< groupId> mysql< / groupId> 
< artifactId> mysql-connector-java< / artifactId> 
< version> 5.1.38< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.springframework.boot< / groupId> 
< artifactId> spring-boot-starter-data-jpa< / artifactId> 
< version> 1.3.5.RELEASE< / version> 
< /依赖关系> 
< /依赖关系> 
 
<包装>战争< / packaging> 
 
< build> 
< plugins> 
< plugin> 
< groupId> org.springframework.boot< / groupId> 
< artifactId> spring-boot-maven-plugin< / artifactId> 
<配置> 
< executable> true< / executable> 
< / configuration> 
< / plugin> 
< / plugins> 
< / build> 
 
< / project>

application.properties 

  debug = true 
 
 spring.datasource.url = jdbc：mysql：// localhost：3306 / springboottutorial 
 spring.datasource.username = springboot 
 spring .datasource.password = hello 
 spring.datasource.driverClassName = com.mysql.jdbc.Driver 
 
 spring.jpa.hibernate.dialect = org.hibernate.dialect.MySQLInnoDBDialect 
 spring.jpa.generate-ddl = true 
 spring.jpa.show-sql = true 
 
 logging.level.org.hibernate.SQL = DEBUG

在这行中 dialect 下面还有一个黄线 spring.jpa.hibernate.dialect = org.hibernate.dialect.MySQLInnoDBDialect 其中说`spring.jpa.hibernate.dialect'是一个未知属性。你的意思是'spring.jpa.hibernate.ddl-auto'，如果这可能是一个问题。

解决方案

发现问题通过阅读另一篇文章，实际上他们内部的软件包和类存在问题，他们无法找到彼此，所以表未创建。



我创建了一个新项目，并将所有类放入同一个包中，并且它可以工作，所以我将根据它修复现有的项目。 b

I am doing a spring-boot project and trying to create a table with hibernate, I get no errors when I run the app and the server starts normally, but the table does not get created.

StatusUpdate.java

package model;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.PrePersist;

@Entity
@Table(name="status_update")
public class StatusUpdate {

    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;

    @Column(name="text")
    private String text;

    @Column(name="added")
    @Temporal(TemporalType.TIMESTAMP)
    private Date added;

    @PrePersist
    protected void onCreate() {
        if (added == null) {
            added = new Date();
        }
    }

    public StatusUpdate(String text) {
        this.text = text;
    }

    public StatusUpdate(String text, Date added) {
        this.text = text;
        this.added = added;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public Date getAdded() {
        return added;
    }

    public void setAdded(Date added) {
        this.added = added;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((added == null) ? 0 : added.hashCode());
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        result = prime * result + ((text == null) ? 0 : text.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        StatusUpdate other = (StatusUpdate) obj;
        if (added == null) {
            if (other.added != null)
                return false;
        } else if (!added.equals(other.added))
            return false;
        if (id == null) {
            if (other.id != null)
                return false;
        } else if (!id.equals(other.id))
            return false;
        if (text == null) {
            if (other.text != null)
                return false;
        } else if (!text.equals(other.text))
            return false;
        return true;
    }

}

pom.xml

<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>1.4.0.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <tiles.version>3.0.7</tiles.version>
    </properties>

    <groupId>com.voja</groupId>
    <artifactId>spring-boot-tutorial</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tiles</groupId>
            <artifactId>tiles-core</artifactId>
            <version>${tiles.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tiles</groupId>
            <artifactId>tiles-jsp</artifactId>
            <version>${tiles.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>1.3.5.RELEASE</version>
        </dependency>
    </dependencies>

    <packaging>war</packaging>

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

</project>

application.properties

debug=true

spring.datasource.url=jdbc:mysql://localhost:3306/springboottutorial
spring.datasource.username=springboot
spring.datasource.password=hello
spring.datasource.driverClassName=com.mysql.jdbc.Driver

spring.jpa.hibernate.dialect=org.hibernate.dialect.MySQLInnoDBDialect
spring.jpa.generate-ddl=true
spring.jpa.show-sql=true

logging.level.org.hibernate.SQL=DEBUG

I also get a yellow line under dialect in this line spring.jpa.hibernate.dialect=org.hibernate.dialect.MySQLInnoDBDialectwhich says `spring.jpa.hibernate.dialect' is an unknown property. Did you mean 'spring.jpa.hibernate.ddl-auto' in case that might be a problem.

解决方案

Found the problem by reading another post, actually there was a problem with packages and classes within them, they couldn't find one another and so the table wasn't created.

I made a new project and put all classes inside the same package and it worked, so I will fix my existing project based on that.

这篇关于休眠不创建表，但没有错误消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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