JDBC 复习笔记2

public class JDBC2 {

public static void main(String[] args) {

Connection cn = null;
PreparedStatement psm = null;
ResultSet rs = null;
String url = "jdbc:mysql://localhost:3306/test";
String user = "root";
String password = "piao";

try {

//mysql对于接口实现的驱动进行加载
Class.forName("com.mysql.jdbc.Driver");

cn = DriverManager.getConnection(url, user, password);

//设置事务提交
cn.setAutoCommit(false);

//PreparedStatement可预编译，效率更高，并且有防止sql注入等优势于Statement
psm = cn.prepareStatement("INSERT INTO student(name, password) VALUES(?,?);");
psm.setString(1, "xiaoqiang");
psm.setString(2, "123");
//添加到批处理中
psm.addBatch();
psm.setString(1, "xiaoruo");
psm.setString(2, "123");
//添加到批处理中
psm.addBatch();
//执行批处理
psm.executeBatch();
cn.commit();

//查询，如果把错误注掉便能查到刚插入的数据
rs = psm.executeQuery("SELECT * FROM student");

//根据数据库显示行返回，如果到最后的空行返回false
while(rs.next()){

//根据列取
System.out.println("name " + rs.getString(2) + "password" + rs.getString(3));

}

} catch (Exception e) {
e.printStackTrace();
try {

cn.rollback();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}finally{

//关闭资源
if (psm != null){
try {
psm.close();
} catch (SQLException e) {
e.printStackTrace();
}
psm = null;
}
if (cn != null){
try {
cn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
cn = null;
}
}

}

}