如何使用 JDBC API 将字符串转换为 Date 对象?
jdbcjava 8object oriented programmingprogramming更新于 2025/3/1 6:04:17
Date 对象的 valueOf() 方法接受表示 JDBC 转义格式(即 yyyy-mm-dd)的 Date 的字符串值，并将给定的字符串值转换为 java.sql.Date 对象。
Date date = Date.valueOf(“date_string”);
假设我们创建了一个名为 employee_data 的表，其描述如下所示:
+----------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+-------+ | id | int(11) | YES | | NULL | | | Name | varchar(255) | YES | | NULL | | | Dob | date | YES | | NULL | | | Location | varchar(255) | YES | | NULL | | +----------+--------------+------+-----+---------+-------+
以下 JDBC 程序接受员工的 ID(整数)、姓名(字符串)、出生日期(字符串)和位置(字符串)，将以 JDBC 转义语法格式传递的出生日期值转换为 Date 对象，并将给定的详细信息插入到 employee_data 表中。最后，它会检索表中的所有记录并显示。
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Scanner;
public class StringtoDate {
public static void main(String args[])throws Exception {
//注册驱动程序
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//获取连接
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//创建 Statement 对象
Statement stmt = con.createStatement();
Scanner sc = new Scanner(System.in);
System.out.println("输入需要插入的记录数:");
int num = sc.nextInt();
//将值插入表中
String query = "INSERT INTO employee_data VALUES (?, ?, ?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
for(int i=1; i<=num; i++) {
System.out.println("Enter the Employee ID: ");
int id = sc.nextInt();
System.out.println("Enter the Employee name: ");
String name =sc.next();
System.out.println("Enter the Employee DOB in the format yyyy-mm-dd : ");
String dateOfBirth = sc.next();
System.out.println("Enter the Employee Location : ");
String loc = sc.next();
pstmt.setInt(1,id);
pstmt.setString(2, name );
pstmt.setDate(3, Date.valueOf(dateOfBirth));
pstmt.setString(4, loc);
pstmt.executeUpdate();
}
System.out.println("data inserted");
//创建 Statement 对象
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from employee_data");
//检索值
while(rs.next()) {
System.out.println("Employee_Id: "+rs.getInt("ID"));
System.out.println("Employee_Name: "+rs.getString("Name"));
System.out.println("Employee_DOB: "+rs.getInt("DOB"));
System.out.println("Employee_Location: "+rs.getString("Location"));
System.out.println();
}
}
}
输出
Connection established...... table created...... Enter the number of records you need to insert in the table: 3 Enter the Employee ID: 1001 Enter the Employee name: Krishna Enter the Employee DOB in the format yyyy-mm-dd : 1989-09-26 Enter the Employee Location : Hyderabad Enter the Employee ID: 1002 Enter the Employee name: Kasyap Enter the Employee DOB in the format yyyy-mm-dd : 1990-06-25 Enter the Employee Location : Vishakhapatnam Enter the Employee ID: 1003 Enter the Employee name: Maruthi Enter the Employee DOB in the format yyyy-mm-dd : 1995-06-06 Enter the Employee Location : Vijayawada data inserted Employee_Id: 1001 Employee_Name: Krishna Employee_DOB: 1989 Employee_Location: Hyderabad Employee_Id: 1002 Employee_Name: Kasyap Employee_DOB: 1990 Employee_Location: Vishakhapatnam Employee_Id: 1003 Employee_Name: Maruthi Employee_DOB: 1995 Employee_Location: Vijayawada
