2.idea上的基本配置
注意 ： 手动测试连接的时候需要注意 4 一定要配置，负责会连接失败
3.出现jdbc驱动找不到的情况的情况 (Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver)
检查是否依赖了mysql-connector-java这个jar (特别注意改jar包的版本号)
在gradle文件下添加依赖
4.代码
public static void main(String[] args)throws SQLException, ClassNotFoundException {
Connection conn =null;
Statement stmt =null;
ResultSet rs =null;
try {
// 加载驱动类
Class.forName("com.mysql.cj.jdbc.Driver");
long start =System.currentTimeMillis();
// 建立连接
// conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/zxdfirst",
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/zxdfirst?serverTimezone=GMT",
"root", "root");
long end = System.currentTimeMillis();
System.out.println(conn);
System.out.println("建立连接耗时： " + (end - start) +"ms 毫秒");
// 创建Statement对象
stmt = conn.createStatement();
// 执行SQL语句
rs = stmt.executeQuery("select * from account");
System.out.println("id\tusername\tpwd\t\tregTime");
while (rs.next()) {
System.out.println("名字" + rs.getString("name"));
System.out.println(rs.getInt(1));
// System.out.println(rs.getInt(1) + "\t" + rs.getString(2)
// + "\t\t" + rs.getString(3) + "\t\t" + rs.getString(4));
}
}catch (SQLException e) {
e.printStackTrace();
}finally {
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();
}
}
}
5.运行成功