backup mysql database java code - java

I tried to run the following code which is to create a backup of my database but it shows some run time errors.
But, I tried to run the System.out.println() output part, (which I've commented in the given code) in mysql shell and it worked.
It shows io file problem. Plz somebody help me.
package files;
public class tableBackup_1 {
public boolean tbBackup(String dbName,String dbUserName, String dbPassword, String path) {
String executeCmd = "mysqldump -u " + dbUserName + " -p" + dbPassword + " --add-drop-database -B " + dbName + " -r " + path;
Process runtimeProcess;
try
{
System.out.println(executeCmd);//this out put works in mysql shell
runtimeProcess = Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();
if (processComplete == 0)
{
System.out.println("Backup created successfully");
return true;
}
else
{
System.out.println("Could not create the backup");
}
} catch (Exception ex)
{
ex.printStackTrace();
}
return false;
}
public static void main(String[] args){
tableBackup_1 bb = new tableBackup_1();
bb.tbBackup("test","harin","1234","C:/Users/Master/Downloads/123.sql");
}
}
mysqldump -u harin -p1234 --add-drop-database -B test -r C:/Users/Master/Downloads/123.sql
java.io.IOException: Cannot run program "mysqldump": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
at java.lang.Runtime.exec(Runtime.java:593)
at java.lang.Runtime.exec(Runtime.java:431)
at java.lang.Runtime.exec(Runtime.java:328)
at files.tableBackup_1.tbBackup(tableBackup_1.java:12)
at files.tableBackup_1.main(tableBackup_1.java:34)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:81)
at java.lang.ProcessImpl.start(ProcessImpl.java:30)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
... 5 more

Please check whether your Global PATH environment variable has <Path to MySQL>\bin in it (Do a echo %PATH% and see). Effectively you should be able to type your System.out.println() content in a Plain DOS prompt and should be able to run it.
Even with that if it doesn't work try changing the code to execute like below
runtimeProcess = Runtime.getRuntime().exec(new String[] { "cmd.exe", "/c", executeCmd });
This should ideally fix the issue.
UPDATE:
If you don't have it in the PATH environment variable change the code to following
String executeCmd = "<Path to MySQL>/bin/mysqldump -u " + dbUserName + " -p" + dbPassword + " --add-drop-database -B " + dbName + " -r " + path;

runtimeProcess = Runtime.getRuntime().exec(new String[] { "cmd.exe", "/c", executeCmd });
i tried this one but it didn't work so i replaced it with
this runtimeProcess = Runtime.getRuntime().exec(executeCmd);
and it worked

I solved this problem by giving full path to mysqldump.exe
You can get SO environment variables by
Map<String, String> env = System.getenv();
final String LOCATION = env.get("MYSQLDUMP");
I setup the system variable like this :
Variable Name : MYSQLDUMP
Value : D:\xampp\mysql\bin\mysqldump.exe
Now just execute this code below,
String executeCmd = LOCATION+" -u " + DBUSER + " --add-drop-database -B " + DBNAME + " -r " + PATH + ""+FILENAME
Process runtimeProcess = = Runtime.getRuntime().exec(executeCmd);
Note : If you don't have configured password for mysql server just remove the -p PASSWORD attribute from the code. And don't forget to restart your computer after creating a new system variable.

Related

Run batch with java return error

I need send parameter and execute batch file from java code. I used this method:
private void run(){
if (atmUsernameField.getText().length() > 0 &&
atmPasswordField.getText().length() > 0 &&
serverURLField.getText().length() > 0){
String atmUsername= atmUsernameField.getText();
String atmPassword = atmPasswordField.getText();
String url = serverURLField.getText();
String userHomePath = System.getProperty("user.home");
userHomePath = userHomePath + File.separator + "INFOKIOSK" + File.separator + "device_jar";
String fileName = userHomePath + File.separator + "restart.bat";
if (SystemUtils.IS_OS_WINDOWS_XP || SystemUtils.IS_OS_WINDOWS) {
try {
String processID = ManagementFactory.getRuntimeMXBean().getName();
int endIndex = processID.indexOf("#");
processID = processID.substring(0, endIndex);
new ProcessBuilder("cmd", "/c", "start " + fileName, processID, atmUsername, atmPassword, url).start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
this is the restart.bat:
TASKKILL /F /PID %1 /T
cd /d %~dp0
java -jar device.jar --atm.autoload.page=%4 --atm.username=%2 --atm.password=%3 -debug
restart.bat need at first killed process where PID = processID
and go to folder where is located he
and running device.jar with parameters.
When I runnin this code on Windows 7 machine, code is worked. If running on Windows XP SP3 machine return error "Not Found C:\Documents ...."
I need running this code on Windows XP machine. where the error is, why the code does not work?
userHomePath contains spaces on winXP.
On Win7 it does not anymore.
Try to add quotes as shown below, it will work in either environment:
new ProcessBuilder("cmd", "/c", "start \"" + fileName + "\"", processID, atmUsername, atmPassword, url).start();
Maybe you'll need to add quotes in your .bat too
cd /d "%~dp0"

executing mysql restore cmd in java runtimeProcess.waitFor() returns 1 always

The following code is always returning 1. I do not understand why.
String executeCmd[] = {"mysql"," -u" + dbUser," -p" + dbPass," -A"," -D"+dbName ," < " + restorePath};
Process runtimeProcess = Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();
if (processComplete == 0) {
System.out.println("Successfully restored from SQL : " + s);
} else {
System.out.println("Error at restoring");
}
I have grilled my head trying to solve this problem for a week and I have finally figured it out.
The problem is, the < in above code (stream redirection). You cannot use stream redirection when executing a process in Java (it simply does not work in this case).
So, you have to do it without using stream redirection. One way of doing it is:
mysql -u root -p**** --execute "SOURCE \\path\\to\\sql"
Try:
String executeCmd[] = {"mysql"," -u "+dbUser," -p"+dbPass," -A"," -D"+dbName," --execute"," \"SOURCE "+restorePath+"\""};
or simply:
String executeCmd = "mysql -u "+dbUser+" -p"+dbPass+" -A -D "+"dbName -e \"SOURCE "+restorePath+"\"";
Redirect < is interpreted by the command shell. Try
String executeCmd[] =
{"bash", "-c", "mysql", "-u", dbUser, "-p", dbPass, "-A","-D", dbName , "< ", restorePath};

mysqldump file creates an empty sql file

i apply comment 1 and 2 alternatively.But i didn't get myqldump file using java.mysqldump working in cmd. i think in cmd it ask password after typing mysqldump comment. please help me fast.thanks in advance.
String dumpCommand = "C:\\Program Files\\MySQL\\MySQL Server 5.0\\bin\\mysqldump" + " -u " + user + " -p" + " " + database + " > " + path;
**//command 1**
Runtime rt = Runtime.getRuntime();
File test = new File(path);
PrintStream ps;
try {
// Process child = rt.exec("Cmd /c \"C:/Program Files/MySQL/MySQL Server 5.0/bin/mysqldump\" -u root -p saxco > "+path);//command 2
Process child = rt.exec(dumpCommand);
ps = new PrintStream(test);
InputStream in = child.getInputStream();
int ch;
while ((ch = in.read()) != -1) {
ps.write(ch);
System.out.write(ch);
}
As documented here you can specify the password in the command like this [...] -pPASSWORD [...]. Note that there must not be a space between the -p option flag and the actual password.
Keep in mind that specifying the password this way is a security risk!
If you don't use a password just don't use the -p option too.
String dumpCommand = "C:\Program Files\MySQL\MySQL Server 5.0\bin\mysqldump" + " -u " + user + database + " > " + path;
or this if you have one (without the gaps)
String dumpCommand = "C:\Program Files\MySQL\MySQL Server 5.0\bin\mysqldump" + " -u " + user + " -p" + password + " " + database + " > " + path;
try this-
String cmd="mysqldump -u "+USER+" -p"+PASSWORD+" "+database+" --routines -r"+PATH;
Runtime runtime = Runtime.getRuntime();
Process exec;
exec = runtime.exec(cmd);
int processComplete = exec.waitFor();
if(processComplete == 0){
System.out.println("Backup taken successfully in "+PATH+" on "+new Date());
} else {
System.out.println("Could not take mysql backup :ERROR:");
}

Error in executing mysql command from java

I was trying to execute the mysql command using java but this always keeps giving error.
String dbName = "dth";
String dbUser = "root";
String dbPass = "root";
String executeCmd = "";
executeCmd = "mysqldump -u " + dbUser + " -p" + dbPass + " " + dbName + " -r C:\\backup.sql";
Process runtimeProcess = Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();
if (processComplete == 0) {
System.out.println("Backup taken successfully");
} else {
System.out.println("Could not take mysql backup");
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
I tried the above code but I couldn't get it done, keeps giving me
CreateProcess error=2, The system cannot find the file specified
error.
I have tried it by creating a .sql file on the location and still I get the same error.
Add the directory in which mysqldump resides into your path environment variable or use the full pathname I.e c:\directory\mysqldump

Exporting database through my java code

I want to export my MySQL database using my java code. But I have not found any way to do. What I want to do that there is a button in my app as "Export Database". When that button is clicked, my database should be exported to specified path. I have used the following code but it does'nt worked :
Runtime runtime = Runtime.getRuntime();
runtime.exec("C:\\Program Files\\MySql\\MySql Server 5.5\\bin\\mysqldump -u root -p myDatabase> D:\\backup.sql");
How should I do this task. Thanks.
Two problems :
the space between -p and the password
the space inside the path to the executable
Prefer this :
runtime.exec(new String[]{"C:\\Program Files\\MySql\\MySql Server 5.5\\bin\\mysqldump", "-u", "root", "-pmyDatabase" "> D:\\backup.sql"});
Note that if you have a problem with runtime.exec, you should look at the streams you can get from the returned Process. Not looking at those streams in case of error is a little like not looking at the exception when one is thrown.
Backup:
/******************************************************/
//Database Properties
/******************************************************/
String dbName = “dbName”;
String dbUser = “dbUser”;
String dbPass = “dbPass”;
/***********************************************************/
// Execute Shell Command
/***********************************************************/
String executeCmd = “”;
executeCmd = “mysqldump -u “+dbUser+” -p”+dbPass+” “+dbName+” -r backup.sql”;
}
Process runtimeProcess =Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();
if(processComplete == 0){
out.println(“Backup taken successfully”);
} else {
out.println(“Could not take mysql backup”);
}
Restore:
/******************************************************/
//Database Properties
/******************************************************/
String dbName = “dbName”;
String dbUser = “dbUser”;
String dbPass = “dbPass”;
/***********************************************************/
// Execute Shell Command
/***********************************************************/
String executeCmd = “”;
executeCmd = new String[]{“/bin/sh”, “-c”, “mysql -u” + dbUser+ ” -p”+dbPass+” ” + dbName+ ” < backup.sql” };
}
Process runtimeProcess =Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();
if(processComplete == 0){
out.println(“success”);
} else {
out.println(“restore failure”);
}
You can try this.
public void actionPerformed(ActionEvent evt)
{
private String m_MySqlPath="";
ResultSet res=null;
res = DBHandler.getInstance().executeQuery("select ##basedir",null);
while(res.next())
{
m_MySqlPath=res.getString(1) ;
}
m_MySqlPath = m_MySqlPath.replace("\\Data\\", "\\bin\\");
if (exportDB.isSelected()
{
try {
String executeCmd = m_MySqlPath + "\\mysqldump -u " + DB_USER
+" -p" + DB_PASSWORD + " " + DB_NAME + " -r " + "\""+FilePath + "\\"
+ FileName+"\"";
Process runtimeProcess = Runtime.getRuntime().exec(executeCmd, null);
BufferedReader r=new BufferedReader(new InputStreamReader(runtimeProcess.getInputStream()));
String s;
while((s=r.readLine())!=null)
{
System.out.println(s);
}
return true;
}
catch (final Exception ex) {
ex.printstackTrace();
return false;
}
}

Categories

Resources