I'm trying to restore a MySQL database from a file generated with mysqldump.
I do it with an ArrayList that contains each query of the restoration plan and I execute each one of them with a Statement.
But sometimes, it stops on some point of the proccess (it can be different on different executions). It doesn't show any error message; it just hangs (when this happens, I need to restart the Mysql service).
This is the code of the restoration:
ArrayList<String> sql;
int res;
FileSQLCommandManager fichero = null;
try {
if (pass == null)
conectar(conn);
else
conectar(conn, pass);
Statement st = null;
st = conn.createStatement();
st.executeUpdate("SET FOREIGN_KEY_CHECKS=0");
PreparedStatement stConstraints = null;
String cadenaSQL = null;
String cadenaSQLConstraints = null;
String cadenaConstraints;
ResultSet rs;
boolean ejecutar = false;
fichero = new FileSQLCommandManager(fic);
fichero.open();
sql = fichero.read();
cadenaSQL = "";
for (int i = 0; i < sql.size(); i++) {
cadenaSQL = sql.get(i);
ejecutar = true;
if (ejecutar) {
st = null;
st = conn.createStatement();
res = st.executeUpdate(cadenaSQL);
if (res == Statement.EXECUTE_FAILED) {
System.out.println("HA FALLADO LA CONSULTA " + cadenaSQL);
}
}
}
st.executeUpdate("SET FOREIGN_KEY_CHECKS=1");
st.close();
fichero.close();
commit();
desconectar();
fichero = null;
return true;
} catch (Exception ex) {
ex.printStackTrace();
rollback();
desconectar();
return false;
}
}
FileSQLCommandManager is a class that fills the ArrayList. This works, the ArrayList content is all right. It stops on executeUpdate of any query (not always, sometimes it works without problems WITH THE SAME SQL FILE).
First I disable the foreign key checks because it can drop a table with a reference (the order of recreation of tables is set by the SQL dump).
Any hint?
Thank's; I'm getting mad with this :(
Why are you going through all that work, when a simple mysql < db_backup.dump will restore the whole thing for you?
this really work for restore
String comando = "C:\\MySQL\\bin\\mysql.exe --host=localhost --port=3306 --user=root --password=123 < D:\\back.sql";
File f = new File("restore.bat");
FileOutputStream fos = new FileOutputStream(f);
fos.write(comando.getBytes());
fos.close();
Process run = Runtime.getRuntime().exec("cmd /C start restore.bat ");
and for backup
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.forLanguageTag("ru"));
java.util.Date currentDate = new java.util.Date();
Process p = null;
try {
Runtime runtime = Runtime.getRuntime();
p = runtime.exec("C:\\MySQL\\bin\\mysqldump.exe --default-character-set=utf8 -uroot -p123 -c -B shch2 -r " + "D:/" + dateFormat.format(currentDate) + "_backup" + ".sql");
//change the dbpass and dbname with your dbpass and dbname
int processComplete = p.waitFor();
if (processComplete == 0) {
System.out.println("Backup created successfully!");
} else {
System.out.println("Could not create the backup");
}
} catch (Exception e) {
e.printStackTrace();
}
but you need to convey the exact path to mysql.exe and mysqldump.exe
Related
So i have database with value like this...
i'm trying to append the value by using insert into without replacing it,the data from this txt file...
but when i reload/refresh the database there is no new data being appended into the database...,
here is my code....
public static void importDatabase(String fileData){
try{
File database = new File(fileData);
FileReader fileInput = new FileReader(database);
BufferedReader in = new BufferedReader(fileInput);
String line = in.readLine();
line = in.readLine();
String[] data;
while (line != null){
data = line.split(",");
int ID = Integer.parseInt(data[0]);
String Nama = data[1];
int Gaji = Integer.parseInt(data[2]);
int Absensi = Integer.parseInt(data[3]);
int cuti = Integer.parseInt(data[4]);
String Status = data[5];
String query = "insert into list_karyawan values(?,?,?,?,?,?)";
ps = getConn().prepareStatement(query);
ps.setInt(1,ID);
ps.setString(2,Nama);
ps.setInt(3,Gaji);
ps.setInt(4,Absensi);
ps.setInt(5,cuti);
ps.setString(6,Status);
line = in.readLine();
}
ps.executeUpdate();
ps.close();
con.close();
System.out.println("Database Updated");
in.close();
}catch (Exception e){
System.out.println(e);
}
}
When i run it, it shows no error but the data never get into database, where did i go wrong?.,...
Auto-commit mode is enabled by default.
The JDBC driver throws a SQLException when a commit or rollback operation is performed on a connection that has auto-commit set to true.
Symptoms of the problem can be unexpected application behavior
update the JVM configuration for the ActiveMatrix BPM node to use the following Oracle connection property:
autoCommitSpecCompliant=false Try once
Note:I am not able to put as comment so i posted as a answer
So I'm trying to import a CSV file into my MySQL database through my Java program. The program imports everything that's in the file, like it's suppose to, but the first row, it send to the end of the table, and the program see it's there, but if I search for that nr, it says it doesn't exists. And if I go directly to the database table and edit the nr(if the nr is 137, and I edit and write 137 again) the program recognize that nr, and if I search for it, it will find, and the database table organizes itself and sends that entry where is suppose to be.
I just don't see any logic in this. I someone could help me out, I'd appreciated.
LOAD DATA INFILE 'C:\\Users\\carla.DESKTOP-9364K9K\\Desktop\\Alunos_1.csv'
INTO TABLE utentes character set utf8
FIELDS TERMINATED BY ','
(NrProcesso, Nome, #Nome_Resumido, Ano, Turma, #Subsidio, #Nome_EE, #NIF, #email, #Obs)
SET
Subsidio = IF(#Subsidio='','Nenhum',#Subsidio),
Nome_Resumido = IF(#Nome_Resumido='',NULL,#Nome_Resumido),
Nome_EE = IF(#Nome_EE='',NULL,#Nome_EE),
NIF = IF(#NIF = '', NULL,#NIF),
email = IF(#email='',NULL,#email),
Obs = IF(#Obs='',NULL,#Obs);
Thanks in advance.
You have do do something to check cell/column value and form a sql to inject in MySQL.
public List<Object> getRecordingsListFromCsv(String csvFileLocation, String mp3FileLocation, String mp3FileLocation2, String saveFileLocation, ChannelSftp sftp) {
Map<String, File> recordingsFilesMap = null;
BufferedReader br = null;
List<String> errorFilesList = new ArrayList<>();
List<Object> tempList = new LinkedList<>();
try {
csvRows = 0;
recordingsFilesMap = new LinkedHashMap<>();
br = new BufferedReader(new FileReader(csvFileLocation));
String line = br.readLine();
scriptLog.info("\n" + csvFileLocation + " loaded. Parsing File...");
while ((line = br.readLine()) != null) {
String[] csvArray = parseCsvLineToArray(line);
// System.out.println(Arrays.asList(csvArray) + "\n\n");
if (csvArray[0].trim().isEmpty()) {
continue;
}
/* Do your stuff here */
csvRows++;
}
} catch (FileNotFoundException e) {
scriptLog.error("\n---ERROR---\n FILE NOT FOUND: " + csvFileLocation);
String errorStr = "Type=" + e.toString();
errorStr += "StackTrace=" + Arrays.toString(e.getStackTrace());
scriptLog.error(errorStr);
} catch (IOException e) {
String errorStr = "Type=" + e.toString();
errorStr += "StackTrace=" + Arrays.toString(e.getStackTrace());
scriptLog.error(errorStr);
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
System.out.println(e.toString());
}
}
}
Hope it will help you at some extent!!
Im getting an image from server as InputStream and then saving it to mySQL database. It works when I use Thread.sleep(5000);. But if I dont use it no picture is saved to the DB or only one picture and half of it or less. So I understand that the program needs time writing image to the database, but how much time? This is the question, I would like to know exactly when it finished writing image to the database and can start with the next image. Below is my code:
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
int ID = rs.getInt(1);
String myName = rs.getString(2);
try {
String myCommand = "take picture and save /mydir/mydir2/mydir3" + myName + ".png";
telnet.sendCommand(myCommand); // Here taking a picture via telnet
// Thread.sleep(5000);// If I uncomment this line it works
String sqlCommand = "UPDATE my_table SET Picture = ? WHERE ID ='" + ID +"';";
PreparedStatement statement = conn.prepareStatement(sqlCommand);
String ftpUrl = "ftp://"+server_IP+"/mydir/mydir2/mydir3" + myName + ".png;type=i";
URL url = new URL(ftpUrl);
URLConnection connUrl = url.openConnection();
//Thread.sleep(5000); // If I uncomment this line, it works too.
InputStream inputStreamTelnet = connUrl.getInputStream();
statement.setBlob(1, inputStreamTelnet);
int row = statement.executeUpdate();
if (row > 0) {
System.out.println("A picture was inserted into DB.");
System.out.println("Value of row(s) : " + row);
}
} catch (Exception e) {
e.printStackTrace();
}
} // End of while
I would expect to put the waiting(sleep) after InputStream inputStreamTelnet = connUrl.getInputStream(); but it doesnt work when I put the sleep after this line. It works only when the sleep is before. Could someone explain me why and I would like to avoid using Thread.sleep(5000); and instead would like to wait exact time or not wait at all which will make the program faster also there might be a case saving the picture can take more than 5 seconds or maybe saving the picture doesnt take time but opening the url connection. There are 2 sleep lines on the code when I uncomment one of them the program works(saves the images to mysql DB successfully). I also verified on the server that the images exist but in the end I dont see them in the mysql DB.
UPDATE : I removed the try block and telnet stuff now it works without waiting but I really need the telnet stuff...
UPDATE 2: After inspecting my telnet class found out that I forgot to apply a change I made to single line... now it works without wait!
Huh, I tested my code on JDK 1.7.0_67 / PostgreSQL 9.2 and it works well:
public class ImageLoader {
private static final int START_IMAGE_ID = 1;
private static final int END_IMAGE_ID = 1000;
private static final String IMAGE_URL = "http://savepic.net/%d.jpg";
public static void main(String[] args) throws SQLException, IOException {
Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost:5432/test", "username", "password");
PreparedStatement imageStatement = connection.prepareStatement("INSERT INTO public.image VALUES(?, ?)");
for (int i = START_IMAGE_ID; i <= END_IMAGE_ID; i++) {
String imageUrl = String.format(IMAGE_URL, i);
URL url = new URL(imageUrl);
URLConnection urlConnection = url.openConnection();
imageStatement.setLong(1, i);
imageStatement.setBytes(2, read(urlConnection.getInputStream()));
int count = imageStatement.executeUpdate();
if (count != 1) {
throw new IllegalStateException("Image with ID = " + i + " not inserted");
} else {
System.out.println("Image (" + imageUrl + ") saved to database");
}
}
imageStatement.close();
connection.close();
}
private static byte[] read(InputStream inputStream) throws IOException {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1 << 15); // assume image average size ~ 32 Kbytes
BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
byte[] buffer = new byte[1 << 10];
int read = -1;
while ((read = bufferedInputStream.read(buffer)) != -1) {
byteArrayOutputStream.write(buffer, 0, read);
}
return byteArrayOutputStream.toByteArray();
}
}
I am getting null value when I am reading the blob data from database. What might be the issue? Can some one help me on this?
Connection con = null;
PreparedStatement psStmt = null;
ResultSet rs = null;
try {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
con =
DriverManager.getConnection("jdbc:oracle:thin:#MyDatabase:1535:XE","password","password");
System.out.println("connection established"+con);
psStmt = con
.prepareStatement("Select Photo from Person where Firstname=?");
int i = 1;
psStmt.setLong(1, "Nani");
rs = null;
rs = psStmt.executeQuery();
InputStream inputStream = null;
while (rs.next()) {
inputStream = rs.getBinaryStream(1);
//Blob blob = rs.getBlob(1);
//Blob blob1 = (Blob)rs.getObject(1);
//System.out.println("blob length "+blob1);//rs.getString(1);
}
System.out.println("bytessssssss "+inputStream);//here i am getting null value.
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I believe you didn't use setString function to assign any value to firstname which leads to null
for example:
ps.preparedStatement("Select photo from person where firstname = ?");
ps.setString(1,"kick"); <----- add this line
system.out.println("bytes "+rs.getBinaryStream(1));
Another suggestions
there is no need to use rs = null; inside try catch block because you have rs=null; at beginning of
your code.
change
InputStream inputStream = null;
to
InputStream inputStream = new InputStream();
or
get rid of InputStream inputStream = null;
source you should take a look at
The most obvious error is using setLong instead of setString.
However one practice is fatal: declaring in advance. This in other languages is a good practice, but in java one should declare as close as possible.
This reduces scope, by which you would have found the error! Namely inputStream is called after a failed rs.next() - outside the loop. Maybe because no records were found.
This practice, declaring as near as feasible, also helps with try-with-resources which were used here to automatically close the statement and result set.
Connection con = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(
"jdbc:oracle:thin:#MyDatabase:1535:XE","password","password");
System.out.println("connection established"+con);
try (PreparedStatement psStmt = con.prepareStatement(
"Select Photo from Person where Firstname=?")) {
int i = 1;
psStmt.setString(1, "Nani");
try (ResultSet rs = psStmt.executeQuery()) {
while (rs.next()) {
try (InputStream inputStream = rs.getBinaryStream(1)) {
//Blob blob = rs.getBlob(1);
//Blob blob1 = (Blob)rs.getObject(1);
//System.out.println("blob length "+blob1);//rs.getString(1);
Files.copy(inputStream, Paths.get("C:/photo-" + i + ".jpg"));
}
++i;
}
//ERROR System.out.println("bytessssssss "+inputStream);
} // Closes rs.
} // Closes psStmt.
}
1- In your code when setting the parameter's value of SQL query, be sure to use the appropriate data type of the field. So here you should use
psStmt.setString(1, "Nani");
instead of
psStmt.setLong(1, "Nani");
2- Make sure that the query is correct (Table name, field name).
3- Make sure that the table is containing data.
How do I connect to data base from servlet. I have tried the following code, but control goes to exception everytime.
try
{
int num_rows = 0;
Connection con = null;
Statement st = null;
Statement search = null;
ResultSet rs = null;
ResultSet searchRS = null;
// Connecting to the database
PrintWriter out = response.getWriter();
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/employees","root","");
st = con.createStatement();
rs = st.executeQuery("select employees.first_name,employees.last_name,employees.gender,employees.hire_date,departments.dept_name,salaries.salary from employees,departments,salaries,dept_emp where employees.emp_no=salaries.emp_no AND dept_emp.emp_no=employees.emp_no AND dept_emp.dept_no=departments.dept_no AND salaries.to_date='9999-01-01' AND (employees.first_name='"+Sname+"' OR employees.last_name='"+Sname+"')");
//Retrieval of data from result set retrieved from database
String[][] str = new String[10][6];
while( rs.next())
{
str[num_rows][0] = rs.getString("first_name");
str[num_rows][1] = rs.getString("last_name");
str[num_rows][2] = rs.getString("gender");
str[num_rows][3] = rs.getString("hire_date");
str[num_rows][4] = rs.getString("dept_name");
str[num_rows][5] = rs.getString("salary");
num_rows++;
}
if(num_rows <10)
{
isLast = true;
var = 0;
}
request.setAttribute("listvalue",str);
request.setAttribute("rows",num_rows);
RequestDispatcher RequestDispatcherObj =request.getRequestDispatcher("SearchName.jsp");
RequestDispatcherObj.forward(request, response);
out.flush();
con.close();
var = var +10;
}
catch(Exception e)
{
e.printStackTrace();
}
Your string array can hold 10 records; probably you are getting more than that from the database.
You may try this-
while( rs.next() && num_rows < 10 )
In case you need to collect all the records, better use some collection like List.
For me looks like the line
RequestDispatcherObj.forward(request, response);
is creating the problem. It is forwarding the request to some other place. The requestdispatcheobj may have closed the out object. So after that use of flush() and write() will lead to an IllegalStateException.
out.flush();
con.close();
var = var +10;
So make sure this is not the case.