Hibernate 自动生成表要注意事项

自动生成默认的数据表

import lombok.Data;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * @ClassName OrderDetail
 * @Description
 * @Author Sky1in3
 * @Date 2019/1/11 2:11
 * @Version 1.0
 */
@Entity
@Data
public class Order {

    /** 订单详情id */
    private String detailId;

    /** 订单id  */
    private String orderId;

    /** 课程id */
    private String productId;

    /** 课程名 */
    private String productName;

    /** 课程售价 */
    private Double productPrice;

    /** 课程库存 */
    private Integer productQuantity;

    /** 课程图标 */
    private String productIcon;
}

以类名、字段名为表的表名和列名来自动生成数据表。

自定义的方式生成数据表

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * @ClassName OrderDetail
 * @Description
 * @Author Sky1in3
 * @Date 2019/1/11 2:11
 * @Version 1.0
 */
@Entity
@Table(name = "order_detail")
public class OrderDetail {

    /** 订单详情id */
    private String detailId;

    /** 订单id  */
    private String orderId;

    /** 课程id */
    private String productId;

    /** 课程名 */
    private String productName;

    /** 课程售价 */
    private Double productPrice;

    /** 课程库存 */
    private Integer productQuantity;

    /** 课程图标 */
    private String productIcon;

    @Id
    @Column(name = "detail_id", length = 32)
    public String getDetailId() {
        return detailId;
    }

    public void setDetailId(String detailId) {
        this.detailId = detailId;
    }

    @Column(name = "order_id")
    public String getOrderId() {
        return orderId;
    }

    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }

    @Column(name = "product_id")
    public String getProductId() {
        return productId;
    }

    public void setProductId(String productId) {
        this.productId = productId;
    }

    @Column(name = "product_name")
    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    @Column(name = "product_price")
    public Double getProductPrice() {
        return productPrice;
    }

    public void setProductPrice(Double productPrice) {
        this.productPrice = productPrice;
    }

    @Column(name = "product_quantity")
    public Integer getProductQuantity() {
        return productQuantity;
    }

    public void setProductQuantity(Integer productQuantity) {
        this.productQuantity = productQuantity;
    }

    @Column(name = "product_icon")
    public String getProductIcon() {
        return productIcon;
    }

    public void setProductIcon(String productIcon) {
        this.productIcon = productIcon;
    }
}

这种方式可以自定义表名和列名。

注：使用@Table注解必须要在字段的get()方法上面加上@Column，不然生成失败；

如果启动项目的时候报一下异常。

Specified key was too long; max key length is 767 bytes

在主键上声明一下长度就可以解决。
例如：

    @Id
    @Column(name = "detail_id", length = 32)
    public String getDetailId() {
        return detailId;
    }