1.新建module
2.构建如下目录,项目目录下新建libs文件夹,将mysql驱动jar包拷贝到里面,然后,右键add as library
3.JDBCUtils.java
import java.sql.*;
public class JDBCUtils {
public static Connection getConnection() {
String driver = "com.mysql.jdbc.Driver"; // 获取mysql数据库的驱动类
String url = "jdbc:mysql://localhost:3306/myworks"; // 连接数据库,myworks为数据库
String name = "root"; //连接mysql的用户名
String pwd = "root"; //连接mysql的密码
try {
Class.forName(driver);
Connection conn = DriverManager.getConnection(url, name, pwd);
return conn;
} catch (ClassNotFoundException e) {
e.printStackTrace();
return null;
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
public static void closeAll(Connection conn, PreparedStatement ps, ResultSet rs) {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (ps != null) {
ps.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws SQLException {
Connection cc = JDBCUtils.getConnection();
// 判断是否连接数据库成功
if (!cc.isClosed()) {
System.out.println("Succeeded connecting to the Database!");
}
Statement statement = cc.createStatement();
// 执行查询语句
String sql = "select * from t_user";
ResultSet rs = statement.executeQuery(sql);
while (rs.next()) {
System.out.println(rs.getString("name") + "");
}
}
}
将配置文件提取成properties文件
jdbc.properties,注意不能加空格
#获取mysql数据库的驱动类
Driver=com.mysql.jdbc.Driver
#连接数据库,myworks为数据库
url=jdbc:mysql://localhost:3306/myworks
#连接mysql的用户名
user=root
#连接mysql的密码
password=root
DataConnection.java
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
public class DataConnection {
private Properties p;
private Connection conn;
private FileInputStream f;
public static void main(String[] args) {
new DataConnection().loadDriver();
}
public void loadDriver(){
p = new Properties();
try{
f = new FileInputStream(new File("D:\\jdbc.properties"));
p.load(f);
System.out.println("数据库正在连接,请等待...");
Class.forName(p.getProperty("Driver").trim());
System.out.println("驱动加载成功!!!");
try{
conn = DriverManager.getConnection(p.getProperty("url").trim(),p.getProperty("user").trim(),p.getProperty("password").trim());
System.out.println("数据库连接成功!!!");
}catch(SQLException e){
System.out.println("不能连接到指定的数据库,请检查相应的基本信息!!!");
e.printStackTrace();
}
}catch(FileNotFoundException e){
System.out.println("指定路径的文件不存在或者无权限访问!!!");
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}catch (ClassNotFoundException e){
System.out.println("无法找到所加载的驱动,或驱动文件不存在!!!");
e.printStackTrace();
}finally {
try{
f.close();
conn.close();
}catch (IOException e){
e.printStackTrace();
}catch(SQLException e){
e.printStackTrace();
}
}
}
}