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Copy pathJDBCUtils.java
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100 lines (85 loc) · 2.47 KB
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package jdbc.util;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.Properties;
/**
* @author ： CodeWater
* @create ：2022-03-09-11:03
* @Function Description ：jdbc工具类
*/
public class JDBCUtils {
private static String url;
private static String user;
private static String password;
private static String driver;
/*文件的读取，只需要读取一次即可拿到这些值，所以使用静态代码块*/
static {
try {
Properties pro = new Properties();
ClassLoader classLoader = JDBCUtils.class.getClassLoader();
URL res = classLoader.getResource("jdbc.properties");
String path = res.getPath();
//加载文件
pro.load(new FileReader(path));
//获取数据、赋值
url = pro.getProperty("url");
user = pro.getProperty("user");
password = pro.getProperty("password");
driver = pro.getProperty("driver");
Class.forName(driver);
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
/*获取连接
* */
public static Connection getConnection() throws SQLException {
return DriverManager.getConnection(url, user, password);
}
/*释放资源*/
public static void close(Statement stmt, Connection conn) {
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
/*释放资源，多个ResultSet
* */
public static void close(ResultSet rs, Statement stmt, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}