I want to execute some mysql statements that are stored in a text file from my C program using the mysql.h library.
My inclination was to do something like the following, but this doesn't work:
mysql_query(conn, "source test.mysql");
This is because the SOURCE command is not a mysql statement in and of itself.
Is there a way call the SOURCE command programmatically and not from the command line?
The source command is a built-in command in the mysql client program, it isn't a SQL command. Your best bet is to either call the mysql client program using the C system function (or an equivalent), or read the file text file yourself a command at a time and pass them to your query function.
Related
I'm trying to add the employee sample database for practicing with MySQL however there's an error since there's a source command and from what I've found it says that MySQL doesn't support this command anymore.
So, how could I add the complete database without any error?
[this is the code line where the source command is called]
SOURCE is one of the mysql client builtin commands. These are recognized by the mysql client, but not by the MySQL Server's SQL parser.
See https://dev.mysql.com/doc/refman/8.0/en/mysql-commands.html
I am trying to import a .csv file with 2 columns (...and just 3 rows...just for testing) using the query:
IMPORT FROM "C:\db2\dtest.csv" OF DEL INSERT INTO TEST_DATA.DTEST (CAR, NICKNAME)
I am getting this error:
SQL0104N: SQL0104N An unexpected token "IMPORT FROM "C:\db2\dtest.csv"
OF DEL" was found following "BEGIN-OF-STATEMENT". Expected tokens may
include: "". SQLSTATE=42601
If I'm just being stupid here please do tell me :)
The IMPORT is not SQL, it is a command. That means you must submit the IMPORT from the Db2 command window (CLP), or from a script, or from a stored procedure . You cannot submit it directly via SQL, unless you use the ADMIN_CMD stored procedure. See the documentation for details and examples. You would use the ADMIN_CMD if you normally interact with databases via a GUI tool.
Using the command line is best ONLY if you will regularly use batch commands, or write scripts in any scripting language - and you are competent at scripting and using command-lines. But this method has pre-requisites especially if the database is on a different hostname or a different Db2-instance than the one you are working with (i.e. the db is remote). For remote databases the database needs to be catalogued via db2 catalog tcpip node .... and db2 catalog database ... commands.
Additionally you must first connect to the database via db2 connect to .... You have to do this regardless of whether the database is local or remote. See docs for details. For local databases you just use db2 connect to dbname where dbname must be your database name.
Using the ADMIN_CMD stored procedure if often easier for new users who are not familiar with using command line tools.
To use the Db2 command window (CLP), you can either use it interactively, or you can use your operating-system shell. On Windows use db2cwadmin.bat to open such a window (for batch or command usage), or run the db2.exe to enter interactive mode. You can then in interactive mode run your import command.
This happened to me when i was importing data from CSV to Sql DB
--In my case this happened because of incorrectly formatted CSV File.
When extracting data from CSV file have a look at the preview of data which will give an idea of where the data is wrong.
It may be because of different characters like , ' ' etc..
--t
I run a MySQL client in windows console and I'm running an SQL script file using the source command. But some characters from the SQL script file gets distorted.
For example if I write the following in the my SQL script file:
INSERT INTO Unit (Unit, Symbol) VALUES ('CELSIUS', '°C');
When I run the SQL script file in my MYSQL client (using verbose):
mysql> source MYFILE.sql
I get this:
INSERT INTO Unit (Unit, Symbol) VALUES ('CELSIUS', '┬░C');
The degrees symbol is replaced with ┬░.
My question is, how can I tell it to read the file characters using a different character map?
The SQL script file is in UTF-8 format.
Try to invoke mysql with an option such as --default-character-set=utf8.
mysql --default-character-set=utf8
I'm building a tool using Delphi and MySQL to restore a script generated with MySQLDump.
It was supposed to load and execute a SQL file and log any possible errors into a given output file.
I thought about execute the mysql command line and send command lines but i don't know if its possible ou how to do it since I just know how to call mysql using windows cmd and execute a single command line using ShellExecute or CreateProcess
I tried to do it with a single command line but it did'nt logged the errors properly
I tried this:
cmd /c mysql.exe --user root < "C:\restore.sql" > "C:\restore_log.txt"
the content of restore.sql was:
drop database test;
It does execute my script, but on the second attempt it should log "database doesn't exist" but restore_log.txt was empty
It would help if anyone could point the way to call mysql and send multiple lines OR a help with my cmd line to log properly
Anyone can help me?
I don't know what components you've got available to connect to the MySQL db, but using TADOQuery to access SQL Server, I simply load up the queries into a TADOQuery's .SQL property and then call Open or ExecSQL. As long as it's just vanilla SQL that was generated by SQLDump, I'd guess that should work. It's worth a try anyway.
digging more at stackoverflow I found previous answers that helped, the difference is that the output goes to a Memo that I can save to a file.
Thank you all for the help and the insights.
The answers can be found on the following links:
Getting output from a shell/dos app into a Delphi app
How do I run a command-line program in Delphi?
Getting output from a shell/dos app into a Delphi app
Attempting to change directories, view directory contents, etc., but for some reason I don't have the system command to use the command line once I run mysql. These are the options I get:
List of all MySQL commands:
Note that all text commands must be first on line and end with ';'
? (\?) Synonym for `help'.
clear (\c) Clear the current input statement.
connect (\r) Reconnect to the server. Optional arguments are db and host.
delimiter (\d) Set statement delimiter.
ego (\G) Send command to mysql server, display result vertically.
exit (\q) Exit mysql. Same as quit.
go (\g) Send command to mysql server.
help (\h) Display this help.
notee (\t) Don't write into outfile.
print (\p) Print current command.
prompt (\R) Change your mysql prompt.
quit (\q) Quit mysql.
rehash (\#) Rebuild completion hash.
source (\.) Execute an SQL script file. Takes a file name as an argument.
status (\s) Get status information from the server.
tee (\T) Set outfile [to_outfile]. Append everything into given outfile.
use (\u) Use another database. Takes database name as argument.
charset (\C) Switch to another charset. Might be needed for processing binlog
with multi-byte charsets.
warnings (\W) Show warnings after every statement.
nowarning (\w) Don't show warnings after every statement.
Any ideas what could cause this? It seems to be possible using windows (using \!).
As stated in the MySQL documentation, the MySQL system command works only in Unix and therefore not in Windows:
http://dev.mysql.com/doc/refman/5.6/en/mysql-commands.html