Question

我正在尝试使用java在sql中插入数据。我写完了但是当我运行它时我收到了这个错误：

线程“main”中的异常java.lang.NullPointerException

没有为jdbc找到合适的驱动程序：sqlite：C：/ Users / inflamesc / Desktop / pp project / neural.sql 在insertapp.insertapp.insert（insertapp.java:26）在insertapp.insertapp.main（insertapp.java:44）

这是我的代码：问题是什么？我做错了什么？

package insertapp;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;



public class insertapp {


private Connection connect() {

    String url = "jdbc:sqlite:C:/Users/inflamesc/Desktop/pp project/neural.db";
    Connection conn = null;
    try {
        conn = DriverManager.getConnection(url);
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    }
    return conn;
}
public void insert(String id, String firstName, String lastName, String userName, String email, String password, String aboutMe ) {
    String sql = "INSERT INTO USERS(id,firstName,lastName,userName,email,password,aboutMe) VALUES(?,?,?,?,?,?,?)";

    try (Connection conn = this.connect();
        PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setString(1, id);
        pstmt.setString(2, firstName);
        pstmt.setString(3, lastName);
        pstmt.setString(4, userName);
        pstmt.setString(5, email);
        pstmt.setString(6, password);
        pstmt.setString(7, aboutMe);

        pstmt.executeUpdate();
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    }
}

public static void main(String[] args) {

    insertapp app = new insertapp();
    app.insert("1", "Jedi","TheLast","TheLastJedi","jedi@example.com","12345","slacker");
    app.insert("2", "Chew","Becca","ChewBecca","chew@example.com","12345","noisy");
}

}

Answer 1

我猜你忘了更换＆＃39; 2＆＃39;在你准备好的声明中：

pstmt.setString(2, firstName);
pstmt.setString(2, lastName);
pstmt.setString(2, userName);
pstmt.setString(2, email);
pstmt.setString(2, password);
pstmt.setString(2, aboutMe);

<强>＆＃39; 2＆＃39;需要以增量方式进行相应修改。

以下是确切的代码：

pstmt.setString(1, id);
pstmt.setString(2, firstName);
pstmt.setString(3, lastName);
pstmt.setString(4, userName);
pstmt.setString(5, email);
pstmt.setString(6, password);
pstmt.setString(7, aboutMe);

希望这能解决你的问题。

错误：线程“main”java.lang.NullPointerException中的异常

1 个答案: