时间:2021-07-01 10:21:17 帮助过:16人阅读
欢迎进入Java社区论坛,与200万技术人员互动交流 >>进入 * 导出一小时内的数据 * @param conn */ public static void Exp(Connection conn) { int counter = 0; //一小时内的数据 Long timestamp = System.currentTimeMillis() - (600 * 60 * 1000);
欢迎进入Java社区论坛,与200万技术人员互动交流 >>进入
* 导出一小时内的数据
* @param conn
*/
public static void Exp(Connection conn) {
int counter = 0;
//一小时内的数据
Long timestamp = System.currentTimeMillis() - (600 * 60 * 1000);
boolean flag = true;
while (flag) {
flag = false;
String Sql = "SELECT * FROM t_test WHERE createTime>"
+ timestamp + " LIMIT 50";
System.out.println("sql===" + Sql);
try {
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(Sql);
while (rs.next()) {
flag = true;
int id = rs.getInt("id");
String title = rs.getString("title");
Long lastmodifytime = rs.getLong("createTime");
timestamp = lastmodifytime;
counter++;
System.out.println("i="+counter+"--id--"+id+"--title-"+title);
}
rs.close();
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void Test() {
Connection Conn=null;
try {
Class.forName("com.mysql.jdbc.Driver")。newInstance();
String jdbcUrl = "jdbc:mysql://127.0.0.1:3306/test?characterEncoding=GBK";
String jdbcUsername = "root";
String jdbcPassword = "mysql";
Conn = DriverManager.getConnection(jdbcUrl, jdbcUsername, jdbcPassword);
System.out.println("conn"+Conn);
for(int i=1;i<=10000;i++)
{
add(Conn,"testTitle"+i+"-"+System.currentTimeMillis());
}
} catch (SQLException e) {
e.printStackTrace();
}
catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
try {
Conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void add(Connection conn,String title)
{
PreparedStatement pstmt = null;
String insert_sql = "insert into t_test(title,createTime) values (?,?)";
System.out.println("sql="+insert_sql);
try {
pstmt = conn.prepareStatement(insert_sql);
pstmt.setString(1,title);
pstmt.setLong(2,System.currentTimeMillis());
int ret = pstmt.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
try {
pstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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