i have a table that i want to query to that and get some values from my bash script and use it in while loop,when i use one column it works as a champ but i cant use more than one i get error like:
read: `IP, PL_Seq': not a valid identifier
here is my SELECT result
and here is may bash script
sql="SELECT IP,PL_Seq FROM mytabel WHERE FLAG=0 AND CIDR =24";
i=0
while IFS=$'\t' read IP, PL_Seq ;do
IP[$i]=$IP
PL_Seq[$i]=$PL_Seq
((i++))
echo $IP
echo $PL_Seq
done < <(mysql TestDB -u $DB_USER --password=$DB_PASSWD -N -e "$sql")
You are nearly there, you just need to remove the comma from the line:
while IFS=$'\t' read IP, PL_Seq ;do
and so:
sql="SELECT IP FROM mytabel WHERE FLAG=0 AND CIDR =24";
i=0
while IFS=$'\t' read IP PL_Seq ;do
IP[$i]=$IP
PL_Seq[$i]=$PL_Seq
((i++))
echo $IP
done < <(mysql TestDB -u $DB_USER --password=$DB_PASSWD -N -e "$sql")
I have a bash script with a variable for mysql connection details and a variable for the query I want to run...
#!/bin/bash
#listed in the for loop are query numbers = names
declare -a array=(
"1=Unprocessed===\"select count(*) from db where test='unknown'\""
"2=Total===\"SELECT count(*) FROM db\""
)
sqlconnection=$"/usr/local/bin/mysql -u user -passwd -h xx.xx.xx.xx -se"
for i in "${array[#]}";
do
#map s=selection n= name q=== sql query
s=$(echo "$i" | awk -F "=" '{print $1}')
n=$(echo "$i" | awk -F "=" '{print $2}')
q=$(echo "$i" | awk -F "===" '{print $2}')
$sqlconnection \("$query"\)
done
while I can get the sql connection and query to echo out it doesn't actually run the query! - there's gotta be something I'm missing :)
sqlconnection should be a function, not a string. Also, you don't need to quote the entire command in each array element; quoting $q when you call your function is sufficient.
declare -a array=(
"1=Unprocessed===select count(*) from db where test='unknown'"
"2=Total===SELECT count(*) FROM db"
)
sqlconnection () {
/usr/local/bin/mysql -u user -passwd -h xx.xx.xx.xx -se "$#"
}
for i in "${array[#]}"; do
IFS== read s n _ _ q <<< "$i"
sqlconnection "$q"
done
please advise how to use select statement result as a variable and pass it further to the script. Simple script:
#!/bin/sh
# --mysql part START--
pwd="pass"
D="db"
mysql -uuser -p$pwd -D$D -s -N -e "SELECT port FROM table where username='$1';"
/usr/bin/mysql -uroot -p$pwd -D$D<< eof
eof
port=$(mysql Select) # declaring select result as a variable , probably wrong
echo "port $port;" >> /tmp/blabla.txt # <- this part is not working
Please advise.
Thanks in advance
You can put it into an a variable, follow this example:
#!/bin/sh
# --mysql part START--
pwd="pass"
D="db"
user="user"
port=$(mysql -u $user -p $pwd -D $D -s -N -e "SELECT port FROM table where username='$1';")
echo "PORT: $port" > /tmp/blabla.txt
I was following this guide on extracting a table from a mysql dump with grep, so I wouldn't have to restore all 50GB of data to have a peek at one table. The two main commands to pull the table are:
grep -n "Table structure" [MySQL_dump_filename].sql
which gets the line numbers for table definitions, then
sed -n '[starting_line_number],[ending_line_number] p' [MySQL_dump_filename].sql > [table_output_filename].sql
I would like to search the .sql dump in reverse order though, as what I need is towards the end of the file and will take quite awhile to grep though the first 48GB of data. I'm on OS X and installed tac (via brew as noted here). But is it possible to setup the command to accomplish this and have it quit after sed grabs the needed lines? If not I might as well grep from the beginning and not tac at all, just wait it out. Or ctrl-c once I see the file populated in another terminal.
Example run:
$ tac dump.sql | grep -n "Table structure"
...
751:-- Table structure for table `answer`
779:-- Table structure for table `template`
806:-- Table structure for table `resource`
...
But of course those are the line numbers in reverse, so if you need the 'template' table you would need to sed -n '752,779 p', but from the end of the file otherwise you'll get the wrong line number (sed will count from the beginning of the file).
a few quick pointers:
dd can help you to skip very fast N bytes/blocks/whatever if you are sure those first N gb are not usefull
after skipping, no need to 1) grep to find line number then 2) sed to skip until line number n (reading twice the huge remaining): you could directly:
awk '/beginningpattern/,/endpattern/ { print $0 ; }' #warning: syntax uncomplete, better read about awk and its prowess. You can do all sort of neat stuff.
Here is a more streamlined way to know where all table definitions begin and end.
For a give file rolando.sql, create a script that does the following:
DAT=rolando.sql
TBLMAP=tblmap.txt
TBLLST=${TBLLST}.lst
TBLTMP=${TBLMAP}.tmp
RUNMAP=DisplayTables.sh
grep -n "^-- Table structure" ${DAT} |sed 's/:/ /'| awk '{print $1}' > ${TBLTMP}
grep -n "^) ENGINE=" ${DAT} |sed 's/:/ /'| awk '{print $1}' >> ${TBLTMP}
sort -n < ${TBLTMP} > ${TBLLST}
rm -f ${TBLTMP}
rm -f ${TBLMAP}
POS=1
for X in `cat ${TBLLST}`
do
(( POS = 1 - POS ))
if [ ${POS} -eq 0 ]
then
(( Y = X - 2 ))
fi
if [ ${POS} -eq 1 ]
then
echo "${Y},${X}" >> ${TBLMAP}
fi
done
rm -f ${TBLLST}
echo "Table Structures From ${DAT}"
for XY in `cat ${TBLMAP}`
do
echo "sed -n '${XY}p' ${DAT}" >> ${RUNMAP}
done
chmod +x ${RUNMAP}
./${RUNMAP}
This script will output every create table statement for you. It will include the DROP TABLE statements also. If you do not want the drop table statements, you this one:
DAT=rolando.sql
TBLMAP=tblmap.txt
TBLLST=${TBLLST}.lst
TBLTMP=${TBLMAP}.tmp
RUNMAP=DisplayTables.sh
grep -n "^CREATE TABLE" ${DAT} | sed 's/:/ /' | awk '{print $1}' > ${TBLTMP}
grep -n "^) ENGINE=" ${DAT} | sed 's/:/ /' | awk '{print $1}' >> ${TBLTMP}
sort -n < ${TBLTMP} > ${TBLLST}
rm -f ${TBLTMP}
rm -f ${TBLMAP}
POS=1
for X in `cat ${TBLLST}`
do
(( POS = 1 - POS ))
if [ ${POS} -eq 0 ]
then
(( Y = X ))
fi
if [ ${POS} -eq 1 ]
then
echo "${Y},${X}" >> ${TBLMAP}
fi
done
rm -f ${TBLLST}
echo echo "Table Structures From ${DAT}" > ${RUNMAP}
for XY in `cat ${TBLMAP}`
do
echo "sed -n '${XY}p' ${DAT}" >> ${RUNMAP}
done
chmod +x ${RUNMAP}
./${RUNMAP}
Give it a Try !!!
I'd like to get dumps of each mysql table into separate files. The manual indicates that the syntax for this is
mysqldump [options] db_name [tbl_name ...]
Which indicates that you know the table names before hand. I could set up the script that knows each table name now, but say I add a new table down the road and forget to update the dump script. Then I'm missing dumps for one or more table.
Is there a way to automagically dump each existing table into a separate file? Or am I going to have to do some script-fu; query the database, get all the table names, and dump them by name.
If I go the script-fu route, what scripting langauges can access a mysql database?
Here's a script that dumps table data as SQL commands into separate, compressed files. It does not require being on the MySQL server host, doesn't hard-code the password in the script, and is just for a specific db, not all db's on the server:
#!/bin/bash
# dump-tables-mysql.sh
# Descr: Dump MySQL table data into separate SQL files for a specified database.
# Usage: Run without args for usage info.
# Author: #Trutane
# Ref: http://stackoverflow.com/q/3669121/138325
# Notes:
# * Script will prompt for password for db access.
# * Output files are compressed and saved in the current working dir, unless DIR is
# specified on command-line.
[ $# -lt 3 ] && echo "Usage: $(basename $0) <DB_HOST> <DB_USER> <DB_NAME> [<DIR>]" && exit 1
DB_host=$1
DB_user=$2
DB=$3
DIR=$4
[ -n "$DIR" ] || DIR=.
test -d $DIR || mkdir -p $DIR
echo -n "DB password: "
read -s DB_pass
echo
echo "Dumping tables into separate SQL command files for database '$DB' into dir=$DIR"
tbl_count=0
for t in $(mysql -NBA -h $DB_host -u $DB_user -p$DB_pass -D $DB -e 'show tables')
do
echo "DUMPING TABLE: $DB.$t"
mysqldump -h $DB_host -u $DB_user -p$DB_pass $DB $t | gzip > $DIR/$DB.$t.sql.gz
tbl_count=$(( tbl_count + 1 ))
done
echo "$tbl_count tables dumped from database '$DB' into dir=$DIR"
The mysqldump command line program does this for you - although the docs are very unclear about this.
One thing to note is that ~/output/dir has to be writable by the user that owns mysqld. On Mac OS X:
sudo chown -R _mysqld:_mysqld ~/output/dir
mysqldump --user=dbuser --password --tab=~/output/dir dbname
After running the above, you will have one tablename.sql file containing each table's schema (create table statement) and tablename.txt file containing the data.
If you want a dump with schema only, add the --no-data flag:
mysqldump --user=dbuser --password --no-data --tab=~/output/dir dbname
You can accomplish this by:
Get the list of databases in mysql
dump each database with mysqldump
# Optional variables for a backup script
MYSQL_USER="root"
MYSQL_PASS="something"
BACKUP_DIR=/srv/backup/$(date +%Y-%m-%dT%H_%M_%S);
test -d "$BACKUP_DIR" || mkdir -p "$BACKUP_DIR"
# Get the database list, exclude information_schema
for db in $(mysql -B -s -u $MYSQL_USER --password=$MYSQL_PASS -e 'show databases' | grep -v information_schema)
do
# dump each database in a separate file
mysqldump -u $MYSQL_USER --password=$MYSQL_PASS "$db" | gzip > "$BACKUP_DIR/$db.sql.gz"
done
Here is the corresponding import.
#!/bin/bash
# import-files-mysql.sh
# Descr: Import separate SQL files for a specified database.
# Usage: Run without args for usage info.
# Author: Will Rubel
# Notes:
# * Script will prompt for password for db access.
[ $# -lt 3 ] && echo "Usage: $(basename $0) <DB_HOST> <DB_USER> <DB_NAME> [<DIR>]" && exit 1
DB_host=$1
DB_user=$2
DB=$3
DIR=$4
DIR=$DIR/*
echo -n "DB password: "
read -s DB_pass
echo
echo "Importing separate SQL command files for database '$DB' into '$DB'"
file_count=0
for f in $DIR
do
echo "IMPORTING FILE: $f"
gunzip -c $f | mysql -h $DB_host -u $DB_user -p$DB_pass $DB
(( file_count++ ))
done
echo "$file_count files importing to database '$DB'"
#!/bin/bash
for i in $(mysql -uUser -pPASSWORD DATABASE -e "show tables;"|grep -v Tables_in_);do mysqldump -uUSER -pPASSWORD DATABASE $i > /backup/dir/$i".sql";done
tar -cjf "backup_mysql_"$(date +'%Y%m%d')".tar.bz2" /backup/dir/*.sql
I have had recently the need to backup a big database (more than 250GB uncompressed dump file) and I found the answers to this question really helpful.
I started using #Trutane approach and it worked like a charm. But I was concerned about dumping tables in different mysql sessions because that could, in some moment, drive to a non-consistent backup.
After some research and testing, I have developed a different solution based on gawk. The basic idea is creating a dump of the whole database using mysqldump with --single-transaction=true and then process the output with gawk to produce a different file for every table.
So I can call:
mysqldump --single-transaction=true -u DBUSERNAME -p DBNAME | \
gawk -v 'database=DBNAME' -f 'backup.awk' -
And it produces, in current folder, a bunch of $database.$table.sql files with the schema of every table and $database.$table.sql.gz files with the content of every table. Thanks to the param --single-transaction=true, all the dump happens in a single transaction and data consistency is ensured.
The content of backup.awk is:
# Split mysqldump output in different files, two per table:
# * First file is named $database.$table.sql and it contains the table schema
# * Second file is named $database.$table.sql.gz and it contains the table data
# The 'database' variable is expected to be provided in command-line
BEGIN {
insert=0
filename=sprintf("%s.header.sql", database);
}
# A line starting with "INSERT INTO" activates inserting mode
/INSERT INTO/ { insert=1 }
# A line containing "-- Table structure for table `name-of-table`" finishes inserting mode
# It is also used to detect table name and change file names accordingly
match($0, /-- Table structure for table `(.*)`/, m) {
insert=0;
table=m[1];
filename=sprintf("%s.%s.sql", database, table);
print sprintf("Dumping table %s\n", table);
}
# If in inserting mode, line is piped to a gzipped file,
# if it is not, it is redirected to an uncompressed schema file
{
if (insert == 1) {
output = sprintf("gzip > %s.gz", filename);
print | output
} else {
print > filename;
}
}
It looks everybody here forgot of autocommit=0;SET unique_checks=0;SET foreign_key_checks=0; that is suppose to speed up the import process ...
#!/bin/bash
MYSQL_USER="USER"
MYSQL_PASS="PASS"
if [ -z "$1" ]
then
echo "Dumping all DB ... in separate files"
for I in $(mysql -u $MYSQL_USER --password=$MYSQL_PASS -e 'show databases' -s --skip-column-names);
do
echo "SET autocommit=0;SET unique_checks=0;SET foreign_key_checks=0;" > "$I.sql"
mysqldump -u $MYSQL_USER --password=$MYSQL_PASS $I >> "$I.sql";
echo "SET autocommit=1;SET unique_checks=1;SET foreign_key_checks=1;commit;" >> "$I.sql"
gzip "$I.sql"
done
echo "END."
else
echo "Dumping $1 ..."
echo "SET autocommit=0;SET unique_checks=0;SET foreign_key_checks=0;" > "$1.sql"
mysqldump -u $MYSQL_USER --password=$MYSQL_PASS $1 >> "$1.sql";
echo "SET autocommit=1;SET unique_checks=1;SET foreign_key_checks=1;commit;" >> "$1.sql"
gzip "$1.sql"
fi
If You want to dump all tables from all databases just combine Elias Torres Arroyo's and Trutane's answer:
And if You don't want to give Your password on terminal, just store Your password in an extra config file (chmod 0600)- see Mysqldump launched by cron and password security
#!/bin/bash
# this file
# a) gets all databases from mysql
# b) gets all tables from all databases in a)
# c) creates subfolders for every database in a)
# d) dumps every table from b) in a single file
# this is a mixture of scripts from Trutane (http://stackoverflow.com/q/3669121/138325)
# and Elias Torres Arroyo (https://stackoverflow.com/a/14711298/8398149)
# usage:
# sk-db.bash parameters
# where pararmeters are:
# d "dbs to leave"
# t " tables to leave"
# u "user who connects to database"
# h "db host"
# f "/backup/folder"
user='root'
host='localhost'
backup_folder=''
leave_dbs=(information_schema mysql)
leave_tables=()
while getopts ":d:t:u:h:f:" opt; do
case $opt in
d) leave_dbs=( $OPTARG )
;;
t) leave_tables=( $OPTARG )
;;
u) user=$OPTARG
;;
h) host=$OPTARG
;;
f) backup_folder=$OPTARG
;;
\?) echo "Invalid option -$OPTARG" >&2
;;
esac
done
echo '****************************************'
echo "Database Backup with these options"
echo "Host $host"
echo "User $user"
echo "Backup in $backup_folder"
echo '----------------------------------------'
echo "Databases to emit:"
printf "%s\n" "${leave_dbs[#]}"
echo '----------------------------------------'
echo "Tables to emit:"
printf "%s\n" "${leave_tables[#]}"
echo '----------------------------------------'
BACKUP_DIR=$backup_folder/$(date +%Y-%m-%dT%H_%M_%S);
CONFIG_FILE=/root/db-config.cnf
function contains() {
local n=$#
local value=${!n}
for ((i=1;i < $#;i++)) {
if [ "${!i}" == "${value}" ]; then
echo "y"
return 0
fi
}
echo "n"
return 1
}
test -d "$BACKUP_DIR" || mkdir -p "$BACKUP_DIR"
# Get the database list, exclude information_schema
database_count=0
tbl_count=0
for db in $(mysql --defaults-extra-file=$CONFIG_FILE -B -s -u $user -e 'show databases' )
do
if [ $(contains "${leave_dbs[#]}" "$db") == "y" ]; then
echo "leave database $db as requested"
else
# dump each database in a separate file
(( database_count++ ))
DIR=$BACKUP_DIR/$db
[ -n "$DIR" ] || DIR=.
test -d $DIR || mkdir -p $DIR
echo
echo "Dumping tables into separate SQL command files for database '$db' into dir=$DIR"
for t in $(mysql --defaults-extra-file=$CONFIG_FILE -NBA -h $host -u $user -D $db -e 'show tables')
do
if [ $(contains "${leave_tables[#]}" "$db.$t") == "y" ]; then
echo "leave table $db.$t as requested"
else
echo "DUMPING TABLE: $db.$t"
# mysqldump --defaults-extra-file=$CONFIG_FILE -h $host -u $user $db $t > $DIR/$db.$t.sql
tbl_count=$(( tbl_count + 1 ))
fi
done
echo "Database $db is finished"
echo '----------------------------------------'
fi
done
echo '----------------------------------------'
echo "Backup completed"
echo '**********************************************'
And also, this helped:
Check if bash array contains value
arrays in bash
named arguments in script
I'm not bash master, but I'd just do it with a bash script. Without hitting MySQL, with knowledge of the data directory and database name, you could just scan for all .frm files (one for every table in that db/directory) for a list of tables.
I'm sure there are ways to make it slicker and accept arguments or whatnot, but this worked well for me.
tables_in_a_db_to_sql.sh
#!/bin/bash
database="this_is_my_database"
datadir="/var/lib/mysql/"
datadir_escaped="\/var\/lib\/mysql\/"
all_tables=($(ls $datadir$database/*.frm | sed s/"$datadir_escaped$database\/"/""/g | sed s/.frm//g))
for t in "${all_tables[#]}"; do
outfile=$database.$t.sql
echo "-- backing up $t to $outfile"
echo "mysqldump [options] $database $t > $outfile"
# mysqldump [options] $database $t > $outfile
done
Fill in the [options] and desired outfile convention as you need, and uncomment the last mysqldump line.
For Windows Servers, you can use a batch file like so:
set year=%DATE:~10,4%
set day=%DATE:~7,2%
set mnt=%DATE:~4,2%
set hr=%TIME:~0,2%
set min=%TIME:~3,2%
IF %day% LSS 10 SET day=0%day:~1,1%
IF %mnt% LSS 10 SET mnt=0%mnt:~1,1%
IF %hr% LSS 10 SET hr=0%hr:~1,1%
IF %min% LSS 10 SET min=0%min:~1,1%
set backuptime=%year%-%mnt%-%day%-%hr%-%min%
set backupfldr=C:\inetpub\wwwroot\backupfiles\
set datafldr="C:\Program Files\MySQL\MySQL Server 5.5\data"
set zipper="C:\inetpub\wwwroot\backupfiles\zip\7za.exe"
set retaindays=21
:: Switch to the data directory to enumerate the folders
pushd %datafldr%
:: Get all table names and save them in a temp file
mysql --skip-column-names --user=root --password=mypassword mydatabasename -e "show tables" > tables.txt
:: Loop through all tables in temp file so that we can save one backup file per table
for /f "skip=3 delims=|" %%i in (tables.txt) do (
set tablename = %%i
mysqldump --user=root --password=mypassword mydatabasename %%i > "%backupfldr%mydatabasename.%backuptime%.%%i.sql"
)
del tables.txt
:: Zip all files ending in .sql in the folder
%zipper% a -tzip "%backupfldr%backup.mydatabasename.%backuptime%.zip" "%backupfldr%*.sql"
echo "Deleting all the files ending in .sql only"
del "%backupfldr%*.sql"
echo "Deleting zip files older than 21 days now"
Forfiles /p %backupfldr% /m *.zip /d -%retaindays% /c "cmd /c del /q #path"
Then schedule it using Windows Task Scheduler.
Also, if you want to exclude certain tables in your backup, note that you can use a where clause on the "show tables" statement, but the column name depends on your database name.
So for example, if your database name is "blah" then your column name in the "show tables" result set will be "tables_in_blah". Which means you could add a where clause something similar to this:
show tables where tables_in_blah <> 'badtable'
or
show tables where tables_in_blah like '%goodtable%'
They complete the route where they would store the backups. East
case we are creating one per day of the week, so we have 7 days of backup and they are recycled.
check how many databases it has and then how many tables each database has. and create a file named by db.tablename.sql
which can then be restored.
regards
#!/bin/bash
USER="root"
MYSQL_PASSWORD="password"
RUTA=/hdd/backup/mysql
diasemana=$(date +\%w)
mkdir -m 7777 $RUTA
mkdir -m 7777 $RUTA/infodb
mkdir -m 7777 $RUTA/$diasemana
mysql -u$USER -p$MYSQL_PASSWORD -e "SHOW DATABASES where \`Database\` <> 'information_schema' and \`Database\` <> 'mysql' and \`Database\` <> 'sys' and \`Database\` <> 'performance_schema';" -N > $RUTA/infodb/db.txt;
for i in $(cat $RUTA/infodb/db.txt);
do
mysql -u$USER -p$MYSQL_PASSWORD -e "USE $i;show tables;" -N >$RUTA/infodb/$i.txt;
for j in $(cat $RUTA/infodb/$i.txt);
do
mysqldump -u$USER -p$MYSQL_PASSWORD $i $j > $RUTA/$diasemana/$i"_"$j".sql";
echo $RUTA/$diasemana/$i"_"$j".sql"
done
done
See the following article by Pauli Marcus:
Howto split a SQL database dump into table-wise files
Splitting a sql file containing a whole database into per-table files
is quite easy: Grep the .sql for any occurence of DROP TABLE. Generate
the file name from the table name that is included in the DROP TABLE
statement. Echo the output to a file. Here is a little script that
expects a .sql file as input:
#!/bin/bash
file=$1 # the input file
directory="$file-splitted" # the output directory
output="$directory/header" # the first file containing the header
GREP="DROP TABLE" # what we are looking for
mkdir $directory # create the output directory
while read line
do
# if the current line contains the wanted statement
if [ $(echo "$line" | grep -c "$GREP") == "1" ]
then
# extract the file name
myfile=$(echo $line | awk '{print $5}' | sed -e 's/`//g' -e 's/;//g')
# set the new file name
output="$directory/$myfile"
fi
echo "$line" >> $output # write to file
done < $file