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HelloJDBC.java
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HelloJDBC.java
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package com.micro.profession.jdbc.practice;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class HelloJDBC {
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static String DB_URL = "jdbc:mysql://localhost/cloud_study";
static final String USER = "root";
static final String PASSWORD = "root";
public static void helloword() throws ClassNotFoundException {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
//1. 加载数据库驱动
Class.forName(JDBC_DRIVER);
//2. 建立数据库连接
try {
// 获得数据库连接
conn = DriverManager.getConnection(DB_URL, USER, PASSWORD);
//3. 执行SQL语句
stmt = conn.createStatement();
rs = stmt.executeQuery("select userName from user");
//4. 获取执行结果
while(rs.next()) {
System.out.println("hello " + rs.getString("userName"));
}
} catch (SQLException e) {
// 异常处理
e.printStackTrace();
} finally {
//5. 清理环境
try {
if(conn != null)
conn.close();
if(stmt != null)
stmt.close();
if(rs != null)
rs.close();
} catch (SQLException e) {
// ignore
}
}
}
public static void main(String[] args) throws ClassNotFoundException {
helloword();
}
}