这是工具类：
private static String driver = null;
private static String url = null;
private static String username = null;
private static String password = null;
static{
try{
InputStream in = jdbcUtils.class.getClassLoader().getResourceAsStream("db.properties");
Properties properties = new Properties();
properties.load(in);
driver = properties.getProperty("name");
url = properties.getProperty("url");
username = properties.getProperty("username");
password = properties.getProperty("password");
//1.驱动只用加载一次
Class.forName(driver);
} catch (Exception e) {
e.printStackTrace();
}
}
//获取连接
public static Connection getConnection() throws SQLException {
return DriverManager.getConnection(url,username,password);
}
//释放连接资源
public static void release(Connection conn, Statement st, ResultSet rs){
if(rs != null){
try {
rs.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
if(st != null){
try {
st.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
if(conn != null){
try {
conn.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
}
配置文件db.properties：
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/jdbcstudy?useUnicode=true&characterEncoding=utf8&useSSL=true
username=root
password=123456
实现代码：
public static void main(String[] args) {
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try {
conn = jdbcUtils.getConnection();//获取数据库连接
st = conn.createStatement();//获得SQL的执行对象
String sql = "INSERT INTO users(id,`name`,`password`,`email`,`birthday`)" +
"VALUES(4,'ding','123456','123456789@qq.com','1990-12-28')";
int i = st.executeUpdate(sql);
if(i > 0){
System.out.println("插入成功");
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
jdbcUtils.release(conn,st,rs);
}
}
然后就是db.properties的位置，在src目录下
我找不出问题，但是有空指针异常
但是在sqlyog中看到数据确实插入成功了
