Java-jdbc增删改查操作

java jdbc增删改查操作：

package com.gordon.jdbc;

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

public class jdbc01 {

	public static void main(String[] args) {
		// selectFunction();
		// insertFunction();
		// updateFunction();
		// deleteFunction();
	}

	public static void deleteFunction() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "root");
			String sql = "DELETE FROM user WHERE ID = ?";
			PreparedStatement st = conn.prepareStatement(sql);
			st.setString(1, "4");
			int res = st.executeUpdate();
			if (res > 0) {
				System.out.println("delete success.");
			} else if (res == 0) {
				System.out.println("deleted.");
			} else {
				System.out.println("delete faild.");
			}
			st.close();
			conn.close();
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	public static void updateFunction() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "root");
			String sql = "UPDATE user SET name = ? WHERE ID = ?";
			PreparedStatement st = conn.prepareStatement(sql);
			st.setString(1, "zhangsan");
			st.setString(2, "4");
			int res = st.executeUpdate();
			if (res > 0) {
				System.out.println("update success.");
			} else {
				System.out.println("update faild.");
			}
			st.close();
			conn.close();

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	public static void insertFunction() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "root");
			String sql = "INSERT INTO user (name) VALUES (?)";
			PreparedStatement st = conn.prepareStatement(sql);
			st.setString(1, "name");
			int res = st.executeUpdate();
			if (res > 0) {
				System.out.println("insert success.");
			} else {
				System.out.println("insert faild.");
			}
			st.close();
			conn.close();

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	public static void selectFunction() {
		try {
			// 1.设置驱动
			Class.forName("com.mysql.jdbc.Driver");

			// 2.获取连接
			Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "root");

			// 3.sql语句
			String sql = "SELECT * FROM user";

			// 3.获取SQL执行者
			PreparedStatement st = conn.prepareStatement(sql);

			// 4.设置参数

			// 5.执行sql语句
			ResultSet rs = st.executeQuery();

			// 6.处理数据
			while (rs.next()) {
				System.out.println(rs.getString("id") + ":" + rs.getString("name"));
			}

			// 7.释放资源
			rs.close();
			st.close();
			conn.close();
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}
}