Question

我是一名Android开发人员。但现在，我需要创建一个Web服务项目。我试图通过STS创建一个弹簧项目。我从互联网上找到了一些演示代码。但它不起作用。当我运行应用程序。控制台输出错误日志：

错误日志：

 Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'test_spring.customer' doesn't exist
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2825)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2459)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2376)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2360)
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:187)
        ... 48 more

Application.java

public class Application {

    public static void main(String[] args) {
    ConfigurableApplicationContext context = SpringApplication.run(Application.class);

    CustomerRepository repository = context.getBean(CustomerRepository.class);

    // save a couple of customers
    repository.save(new Customer("Jack", "Bauer"));
    repository.save(new Customer("Chloe", "O'Brian"));
    repository.save(new Customer("Kim", "Bauer"));
    repository.save(new Customer("David", "Palmer"));
    repository.save(new Customer("Michelle", "Dessler"));

    // fetch all customers
    Iterable<Customer> customers = repository.findAll();
    System.out.println("Customers found with findAll():");
    System.out.println("-------------------------------");
    for (Customer customer : customers) {
        System.out.println(customer);
    }
    System.out.println();

    // fetch an individual customer by ID
    Customer customer = repository.findOne(1L);
    System.out.println("Customer found with findOne(1L):");
    System.out.println("--------------------------------");
    System.out.println(customer);
    System.out.println();

    // fetch customers by last name
    List<Customer> bauers = repository.findByLastName("Bauer");
    System.out.println("Customer found with findByLastName('Bauer'):");
    System.out.println("--------------------------------------------");
    for (Customer bauer : bauers) {
        System.out.println(bauer);
    }

          context.close();
    }
}

Customer.java

    @Entity
    public class Customer {

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

        protected Customer() {}

        public Customer(String firstName, String lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
        }

        @Override
        public String toString() {
            return String.format(
                    "Customer[id=%d, firstName='%s', lastName='%s']",
                    id, firstName, lastName);
        }

    }

CustomerRespository.java

  public interface CustomerRepository extends CrudRepository<Customer, Long> {

       List<Customer> findByLastName(String lastName);
  }

application.properties

   spring.datasource.url=jdbc:mysql://localhost/test_spring
   spring.datasource.username=user
   spring.datasource.password=123456
   spring.datasource.driverClassName=com.mysql.jdbc.Driver


   spring.jpa.hibernate.ddl-auto=create-drop
   spring.jpa.database-platform=org.hibernate.dialect.SQLServerDialect
   spring.jpa.show-sql=true

的pom.xml

 <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-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.27</version>
    </dependency>
</dependencies>

=================================

为什么它不会自动创建表格。

请帮我修理或告诉我如何创建一个Web服务项目，非常感谢。哈哈

Answer 1

我认为您可能只需要将以下内容添加到application.properties：

spring.jpa.generate-ddl=true

但是，您还将其配置为使用SQLServerDialect。那应该是：

org.hibernate.dialect.MySQL5InnoDBDialect

或

org.hibernate.dialect.MySQLDialect

如何使用STS创建“spring boot + mysql + hibernate”webservice

1 个答案: