我正在尝试在后台调用查询来删除在5分钟之前插入的记录，并且此刻不会更新。
我已经尝试过这个查询但它有效，但我不知道如何每5分钟调用一次。
DELETE FROM bus WHERE created_at < (NOW() - INTERVAL 5 MINUTE)
正在为来自其他类的每个请求调用insertData方法。
public int insertData(String mac, int route, double latD, double longD) {
int status = 201;
connection();
String host = "jdbc:mysql://localhost/busTracker";
String user = "root";
String password = "";
try {
Connection con = DriverManager.getConnection(host, user, password);
// Create a statement
Statement stt = con.createStatement();
boolean result = stt.execute("SELECT 1 FROM bus LIMIT 1");
if (result) {
PreparedStatement prepBefore = con
.prepareStatement("SELECT latitude, longitude from bus");
ResultSet rs = prepBefore.executeQuery();
ArrayList<Double> array = new ArrayList<Double>();
while (rs.next()) {
double lat2 = rs.getDouble("latitude");
double lon2 = rs.getDouble("longitude");
double dist = haversineDistance(latD, longD, lat2, lon2);
array.add(dist);
}
System.out.println("Array size: " + array.size());
for (double item : array) {
if (item < 4) {
status = 208;
System.out.println("Status: " + status);
return status;
} else {
insert_update_data(mac, route, latD, longD, con);
}
}
return status;
} else {
// Create bus table
stt.execute("CREATE TABLE IF NOT EXISTS bus"
+ "(id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,"
+ "mac VARCHAR(30) NOT NULL UNIQUE,"
+ "route int(11) NOT NULL,"
+ "latitude FLOAT(10,6) NOT NULL,"
+ "longitude FLOAT(10,6) NOT NULL,"
+ "created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)");
insert_update_data(mac, route, latD, longD, con);
return status;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return status = 501;
}
}
正在调用insert方法的storeData方法。
@POST
@Consumes(MediaType.APPLICATION_JSON)
public Response storeData(Data data) {
String macD = data.getMac();
int routeD = data.getRoute();
float latD = data.getLatitude();
float longD = data.getLongitude();
Database db = new Database();
int status = db.insertData(macD, routeD, latD, longD);
return Response.status(status).build();
}
}