JDBC工具类

className=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mydb2
user=root
password=root

package com.huowolf.util;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class JdbcUtil {
private static String className;
private static String url;
private static String user;
private static String password;
static{
try {
InputStream in = JdbcUtil.class.getClassLoader().getResourceAsStream("dbinfo.properties");
Properties props = new Properties();
props.load(in);
className = props.getProperty("className");
url = props.getProperty("url");
user = props.getProperty("user");
password = props.getProperty("password");
Class.forName(className);
} catch (Exception e) {
e.printStackTrace();
}
}
public static Connection getConnection() throws Exception{
return DriverManager.getConnection(url, user, password);
}
public static void release(ResultSet rs,Statement stmt,Connection conn){
try {
if(rs!=null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
if(stmt!=null)
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
if(conn!=null)
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

package com.huowolf;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import com.huowolf.util.JdbcUtil;
public class JdbcDemo {
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
conn = JdbcUtil.getConnection();
stmt = conn.createStatement();
rs = stmt
.executeQuery("select id,name,password,email,birthday from users");
while (rs.next()) {
System.out.println("------------------------");
System.out.println(rs.getObject("id"));
System.out.println(rs.getObject("name"));
System.out.println(rs.getObject("password"));
System.out.println(rs.getObject("email"));
System.out.println(rs.getObject("birthday"));
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
JdbcUtil.release(rs, stmt, conn);
}
}
}

JDBC工具类

标签：jdbc   工具类   连接数据库