使用h2数据库和JPA运行spring boot时，出现以下错误。

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.tool.schema.internal.SchemaCreatorImpl.applySqlString(SchemaCreatorImpl.java:440) [hibernate-core-5.2.17.Final.jar:5.2.17.Final]

这是由于低于一

Caused by: org.h2.jdbc.JdbcSQLException: Syntax error in SQL statement "CREATE TABLE EXCHANGE_VALUE (ID INTEGER NOT NULL, CONVERSION_MULTIPLE DECIMAL(19,2), FROM[*] VARCHAR(255), PORT INTEGER NOT NULL, TO VARCHAR(255), PRIMARY KEY (ID)) "; expected "identifier"; SQL statement:
create table exchange_value (id integer not null, conversion_multiple decimal(19,2), from varchar(255), port integer not null, to varchar(255), primary key (id)) [42001-197]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:357) ~[h2-1.4.197.jar:1.4.197]
    at org.h2.message.DbException.getSyntaxError(DbException.java:217) ~[h2-1.4.197.jar:1.4.197]

我的hibernate课

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="Exchange_Value")
public class ExchangeValue {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id; 
    private String from;
    private String to;
    private BigDecimal conversionMultiple;
    private int port;

    public ExchangeValue() {

    }

    public ExchangeValue(String from, String to, BigDecimal conversionMultiple) {
        super();
//      this.id = id;
        this.from = from;
        this.to = to;
        this.conversionMultiple = conversionMultiple;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }   
}

application.properties在下面

spring.application.name=currency-exchange-service
server.port=8000
spring.jpa.hibernate.ddl-auto= create-drop

只想知道我在代码中缺少的内容，尝试添加spring.jpa.hibernate.ddl-auto = create-drop，但没有帮助。