servlet向MySQL插入数据，Int可以成功，String无法插入

Z时代
2024-01-10
分类：IT

下面是报出的错误，百度之后我已经删除了对应表的外键和约束，重启了服务器，还是无法插入。
java.sql.SQLException: Duplicate key or integrity constraint violation message from server: "Column 'CourlerTitle' cannot be null"
servlet中的相应代码

`String sql = "insert into t_courler(CourlerId,CourlerTitle,UserId,CourlerContent) values(?,?,?,?)";
                //String sql = "insert into t_courler(CourlerId,UserId) values(?,?)";
                // 获取PreparedStatement  
               PreparedStatement ps = conn.prepareStatement(sql);  
                // 对SQL语句中的第1个参数赋值  
                ps.setInt(1, book.getCourierId());  
               ps.setString(2, book.getCourierTitle());  
                ps.setInt(3, book.getUserId());                
               ps.setString(4, book.getCourierContent());  
                // 执行更新操作，返回所影响的行数  
                int row = ps.executeUpdate();  
                // 判断是否更新成功  
                if (row > 0) {  
                    // 更新成输出信息  
                    System.out.print("成功添加了 " + row + "条数据！");  
                }  
                // 关闭PreparedStatement，释放资源  
                ps.close();  
                // 关闭Connection，释放资源  
                conn.close();  `

对应的javabean代码

package com.fz.bean;
public class courierData {
        public int getCourierId() {
        return CourierId;
    }
    public void setCourierId(int courierId) {
        this.CourierId = courierId;
    }
    public String getCourierTitle() {
        return CourierTitle;
    }
    public void setCourierTitle(String courierTitle) {
        this.CourierTitle = courierTitle;
    }
    public String getCourierContent() {
        return CourierContent;
    }
    public void setCourierContent(String courierContent) {
        this.CourierContent = courierContent;
    }
    public int getUserId() {
        return UserId;
    }
    public void setUserId(int userId) {
        this.UserId = userId;
    }
    public String getCourierImage() {
        return CourierImage;
    }
    public void setCourierImage(String courierImage) {
        this.CourierImage = courierImage;
    }
    public float getCourierMoney() {
        return CourierMoney;
    }
    public void setCourierMoney(float courierMoney) {
        this.CourierMoney = courierMoney;
    }
    public String getCourierDate() {
        return CourierDate;
    }
    public void setCourierDate(String courierDate) {
        this.CourierDate = courierDate;
    }
    public int getOrderId() {
        return OrderId;
    }
    public void setOrderId(int orderId) {
        this.OrderId = orderId;
    }
        public String getCourierWeight() {
        return CourierWeight;
    }
    public void setCourierWeight(String courierWeight) {
        CourierWeight = courierWeight;
    }
        private int CourierId;                        //快递信息id
        private String CourierTitle;                //快递标题
        private String CourierContent;        //快递内容
        private int UserId;                            //发布人id
        private String CourierImage;            //快递图片
        private float CourierMoney;            //快递悬赏
        private String CourierDate;                //快递发布日期
        private int OrderId;                    //接单人
        private String CourierWeight;        //快递重量}

请求的jsp页面相应代码

<form action="courierServlet?method=update" method="post" onsubmit="check(this)">  
    <table align="center" width="450">  
        <tr>  
            <td align="center" colspan="2">  
                <h2>添加图书信息</h2>  
                <hr>  
            </td>  
        </tr>  
        <tr>  
            <td align="right">快递ID：</td>  
            <td><input type="text" name="courierId"></td>  
        </tr>  
        <tr>  
            <td align="right">title：</td>  
            <td><input type="text" name="courierTitle"></td>  
        </tr>  
        <tr>  
            <td align="right">用户ID：</td>  
            <td><input type="text" name="userId" /></td>  
        </tr>  
        <tr>  
            <td align="right">content：</td>  
            <td><input type="text" name="courierContent" /></td>  
        </tr>  
        <tr>  
            <td align="center" colspan="2"><input type="submit" value="添　加">  
            </td>  
        </tr>  
    </table>  </form>