还原用Java中mysqldump创建的备份文件时发生错误
还原用Java中mysqldump创建的备份文件时发生错误
提问于 2014-09-17 23:24:00
我有一个Swing应用程序，允许用户备份或恢复数据库。作为后援，没问题。
对于导入，在mysql命令行中完成时，一切都可以正常工作，例如，C:\Export_DB_Philatelio_18_09_2014_12_39_34.sql C:\Users\Admin71>mysql -u root -p philateliodb <
但是，当试图从Java代码中导入时，它不起作用。下面是我使用的代码：
try
{
File file = fileChooser.getSelectedFile();
//DISABLE FOREIGN KEY CHECKS FOR IMPORT
Connection con = Share.connection;
Statement stmt = con.createStatement();
stmt.execute("SET FOREIGN_KEY_CHECKS=0");
stmt.close();
//////////
String dbUserName = "root";
String dbPassword = "";
String dbName = "philateliodb";
String executeCmd = "mysql -u " + dbUserName + " -p" + dbPassword + " " + dbName + " <" + "\""
+ file.getCanonicalPath() + "\"";
Process runtimeProcess = Runtime.getRuntime().exec(executeCmd);
InputStream is = runtimeProcess.getInputStream();
int byteRead = -1;
while ( (byteRead = is.read()) != -1 )
{
System.out.print((char) byteRead);
}
int processComplete = runtimeProcess.waitFor();
if ( processComplete == 0 )
{
System.out.println("The database has been restored !");
}
else
{
System.out.println("Error : the database could not be restored !");
}
//RE_ENABLE FOREIGN KEY CHECKS AFTER IMPORT
stmt = con.createStatement();
stmt.execute("SET FOREIGN_KEY_CHECKS=1");
stmt.close();
//////////
}
catch (IOException e)
{
e.printStackTrace();
}
catch (SQLException e)
{
e.printStackTrace();
}
catch (InterruptedException e)
{
e.printStackTrace();
}但我总是得到“错误:数据库无法恢复!”消息。
下面是我从Eclipse中的控制台输出中得到的信息：
mysql Ver 14.14 Distrib 5.6.17, for Win64 (x86_64)
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Usage: mysql [OPTIONS] [database]
-?, --help Display this help and exit.
-I, --help Synonym for -?
--auto-rehash Enable automatic rehashing. One doesn't need to use
'rehash' to get table and field completion, but startup
and reconnecting may take a longer time. Disable with
--disable-auto-rehash.
(Defaults to on; use --skip-auto-rehash to disable.)
-A, --no-auto-rehash
No automatic rehashing. One has to use 'rehash' to get
table and field completion. This gives a quicker start of
mysql and disables rehashing on reconnect.
--auto-vertical-output
Automatically switch to vertical output mode if the
result is wider than the terminal width.
-B, --batch Don't use history file. Disable interactive behavior.
(Enables --silent.)
--bind-address=name IP address to bind to.
--character-sets-dir=name
Directory for character set files.
--column-type-info Display column type information.
-c, --comments Preserve comments. Send comments to the server. The
default is --skip-comments (discard comments), enable
with --comments.
-C, --compress Use compression in server/client protocol.
-#, --debug[=#] This is a non-debug version. Catch this and exit.
--debug-check Check memory and open file usage at exit.
-T, --debug-info Print some debug info at exit.
-D, --database=name Database to use.
--default-character-set=name
Set the default character set.
--delimiter=name Delimiter to be used.
--enable-cleartext-plugin
Enable/disable the clear text authentication plugin.
-e, --execute=name Execute command and quit. (Disables --force and history
file.)
-E, --vertical Print the output of a query (rows) vertically.
-f, --force Continue even if we get an SQL error.
-G, --named-commands
Enable named commands. Named commands mean this program's
internal commands; see mysql> help . When enabled, the
named commands can be used from any line of the query,
otherwise only from the first line, before an enter.
Disable with --disable-named-commands. This option is
disabled by default.
-i, --ignore-spaces Ignore space after function names.
--init-command=name SQL Command to execute when connecting to MySQL server.
Will automatically be re-executed when reconnecting.
--local-infile Enable/disable LOAD DATA LOCAL INFILE.
-b, --no-beep Turn off beep on error.
-h, --host=name Connect to host.
-H, --html Produce HTML output.
-X, --xml Produce XML output.
--line-numbers Write line numbers for errors.
(Defaults to on; use --skip-line-numbers to disable.)
-L, --skip-line-numbers
Don't write line number for errors.
-n, --unbuffered Flush buffer after each query.
--column-names Write column names in results.
(Defaults to on; use --skip-column-names to disable.)
-N, --skip-column-names
Don't write column names in results.
--sigint-ignore Ignore SIGINT (CTRL-C).
-o, --one-database Ignore statements except those that occur while the
default database is the one named at the command line.
-p, --password[=name]
Password to use when connecting to server. If password is
not given it's asked from the tty.
-W, --pipe Use named pipes to connect to server.
-P, --port=# Port number to use for connection or 0 for default to, in
order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/services, built-in default (3306).
--prompt=name Set the mysql prompt to this value.
--protocol=name The protocol to use for connection (tcp, socket, pipe,
memory).
-q, --quick Don't cache result, print it row by row. This may slow
down the server if the output is suspended. Doesn't use
history file.
-r, --raw Write fields without conversion. Used with --batch.
--reconnect Reconnect if the connection is lost. Disable with
--disable-reconnect. This option is enabled by default.
(Defaults to on; use --skip-reconnect to disable.)
-s, --silent Be more silent. Print results with a tab as separator,
each row on new line.
--shared-memory-base-name=name
Base name of shared memory.
-S, --socket=name The socket file to use for connection.
--ssl Enable SSL for connection (automatically enabled with
other flags).
--ssl-ca=name CA file in PEM format (check OpenSSL docs, implies
--ssl).
--ssl-capath=name CA directory (check OpenSSL docs, implies --ssl).
--ssl-cert=name X509 cert in PEM format (implies --ssl).
--ssl-cipher=name SSL cipher to use (implies --ssl).
--ssl-key=name X509 key in PEM format (implies --ssl).
--ssl-crl=name Certificate revocation list (implies --ssl).
--ssl-crlpath=name Certificate revocation list path (implies --ssl).
--ssl-verify-server-cert
Verify server's "Common Name" in its cert against
hostname used when connecting. This option is disabled by
default.
-t, --table Output in table format.
--tee=name Append everything into outfile. See interactive help (\h)
also. Does not work in batch mode. Disable with
--disable-tee. This option is disabled by default.
-u, --user=name User for login if not current user.
-U, --safe-updates Only allow UPDATE and DELETE that uses keys.
-U, --i-am-a-dummy Synonym for option --safe-updates, -U.
-v, --verbose Write more. (-v -v -v gives the table output format).
-V, --version Output version information and exit.
-w, --wait Wait and retry if connection is down.
--connect-timeout=# Number of seconds before connection timeout.
--max-allowed-packet=#
The maximum packet length to send to or receive from
server.
--net-buffer-length=#
The buffer size for TCP/IP and socket communication.
--select-limit=# Automatic limit for SELECT when using --safe-updates.
--max-join-size=# Automatic limit for rows in a join when using
--safe-updates.
--secure-auth Refuse client connecting to server if it uses old
(pre-4.1.1) protocol.
(Defaults to on; use --skip-secure-auth to disable.)
--server-arg=name Send embedded server this as a parameter.
--show-warnings Show warnings after every statement.
--plugin-dir=name Directory for client-side plugins.
--default-auth=name Default authentication client-side plugin to use.
--histignore=name A colon-separated list of patterns to keep statements
from getting logged into mysql history.
--binary-mode By default, ASCII '\0' is disallowed and '\r\n' is
translated to '\n'. This switch turns off both features,
and also turns off parsing of all clientcommands except
\C and DELIMITER, in non-interactive mode (for input
piped to mysql or loaded using the 'source' command).
This is necessary when processing output from mysqlbinlog
that may contain blobs.
--connect-expired-password
Notify the server that this client is prepared to handle
expired password sandbox mode.
Default options are read from the following files in the given order:
C:\Windows\my.ini C:\Windows\my.cnf C:\my.ini C:\my.cnf C:\wamp\bin\mysql\mysql5.6.17\my.ini C:\wamp\bin\mysql\mysql5.6.17\my.cnf
The following groups are read: mysql client
The following options may be given as the first argument:
--print-defaults Print the program argument list and exit.
--no-defaults Don't read default options from any option file,
except for login file.
--defaults-file=# Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.
--defaults-group-suffix=#
Also read groups with concat(group, suffix)
--login-path=# Read this path from the login file.
Variables (--variable-name=value)
and boolean options {FALSE|TRUE} Value (after reading options)
--------------------------------- ----------------------------------------
auto-rehash FALSE
auto-vertical-output FALSE
bind-address (No default value)
character-sets-dir (No default value)
column-type-info FALSE
comments FALSE
compress FALSE
debug-check FALSE
debug-info FALSE
database (No default value)
default-character-set auto
delimiter ;
enable-cleartext-plugin FALSE
vertical FALSE
force FALSE
named-commands FALSE
ignore-spaces FALSE
init-command (No default value)
local-infile FALSE
no-beep FALSE
host (No default value)
html FALSE
xml FALSE
line-numbers TRUE
unbuffered FALSE
column-names TRUE
sigint-ignore FALSE
port 3306
prompt mysql>
quick FALSE
raw FALSE
reconnect FALSE
shared-memory-base-name (No default value)
socket /tmp/mysql.sock
ssl FALSE
ssl-ca (No default value)
ssl-capath (No default value)
ssl-cert (No default value)
ssl-cipher (No default value)
ssl-key (No default value)
ssl-crl (No default value)
ssl-crlpath (No default value)
ssl-verify-server-cert FALSE
table FALSE
user root
safe-updates FALSE
i-am-a-dummy FALSE
connect-timeout 0
max-allowed-packet 16777216
net-buffer-length 16384
select-limit 1000
max-join-size 1000000
secure-auth TRUE
show-warnings FALSE
plugin-dir (No default value)
default-auth (No default value)
histignore (No default value)
binary-mode FALSE
connect-expired-password FALSE这个mysql输出似乎没有显式地引用错误。或者是真的？有人有主意吗？
Stack Overflow用户
回答已采纳
发布于 2014-09-17 23:50:41
您发布的MySQL输出是帮助/使用信息，通常在您请求它或不正确地调用mysql时会看到。您的第一个问题是尝试重定向，并使用one-arg Runtime.getRuntime().exec(String)。
是windows cmd.exe或unix/linux将<解释为从某个地方重定向stdin，然后打开并启动该程序，设置文件描述符进行重定向。
Runtime.exec是，而不是，它是命令行处理器，您在executeCommand中使用的<对它没有意义。它只是作为另一个参数传递给程序mysql，该程序不知道如何处理它。
因此，您使用的System.out.print((char) byteRead);只是打印到您的Java程序的标准输出，而不是重定向到mysql的标准输入。您必须使用runtimeProcess.getOutputStream()，它从javadoc中“返回连接到子进程的正常输入的输出流”，然后将文件内容提供给该流，而不是System.out。
作为一种最佳实践--永远不要使用.exec(String command) --总是再次使用.exec(String[] cmdarray)，因为.exec不是命令处理程序，只是在空格上中断单个字符串(中断使用空格使用文件名的所有尝试)。
使用String[]表单可以让您完全控制实际的args传递给您调用的程序。
还请参阅.exec(cmdarry, envp, File dir)，以获得对流程的更多控制。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/25901902
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