JDBC简单范例

连接工具类

import java.sql.Connection;
import java.sql.DriverManager;

public class DBUtil {
    // 建立连接方法
    public static Connection open() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            return DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/GeekDB", "root", "123456");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    // 关闭连接方法
    public static void close(Connection conn) {
        if (conn != null) {
            try {
                conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

}

使用范例

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

public class Test {

    public static void main(String[] args) {

        Connection conn = null;
        String sql = null;
        Statement stmt = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;

        // Statement查询*
        sql = "select * from customertbl";
        conn = DBUtil.open();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);
            while (rs.next()) {
                int id = rs.getInt(1);
                String name = rs.getString(2);
                String email = rs.getString(3);
                System.out.println(id + " " + name + " " + email);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(conn);
            System.out.println("-----DONE-----");
        }

        // PreparedStatement插入一条
        sql = "insert into customertbl (name, email) values (?, ?)";
        conn = DBUtil.open();
        try {
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, "Amy");
            pstmt.setString(2, "[email protected]");
            pstmt.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(conn);
            System.out.println("-----DONE-----");
        }

    }
}