1. Description
In the java development process, some classes like Scanner and Random are often used in the code. They are classes for keyboard input and random number generation, like a Like tools, they are called tool classes in Java.
2. Steps
Encapsulate the JDBC tool class
Add a method to obtain the database connection object
Add a method to release the connection
3. Example
package com.qianfeng.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* JDBC工具类
* 有获取连接的方法
* @author dushine
*/
public class JDBCUtil {
/**
* 获取数据库连接的方法
* @return Connection conn
* @throws SQLException
*/
public static Connection getConnection() throws SQLException {
String url = "jdbc:mysql://localhost:3306/class?useSSL=false";
String user = "root";
String password = "root";
Connection conn = DriverManager.getConnection(url,user,password);
return conn;
}
/**
* 释放连接的方法
* @param conn
* @throws SQLException
*/
public static void releaseSourse(Connection conn) throws SQLException {
if (conn != null) {
conn.close();
}
}
/**
* 释放连接的方法
* @param conn 数据库连接对象
* @param stmt 执行SQL语句的对象
* @throws SQLException
*/
public static void releaseSourse(Connection conn,Statement stmt) throws SQLException {
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
/**
* 释放连接的方法
* @param conn 数据库连接对象
* @param stmt 执行SQL语句的对象
* @param resultSet 执行SQL语句的返回的结果集
* @throws SQLException
*/
public static void releaseSourse(Connection conn,Statement stmt,ResultSet resultSet) throws SQLException {
if (resultSet != null) {
resultSet.close();
}
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
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