How can I make SQL queries from within emacs scripts to MySql then print the result set?
#!/usr/bin/emacs --script
(setq sql "select id, name
from foobar
order by name
")
(princ sql)
If you need a really reliable way to use mysql I would suggest using python mysql libraries via pymacs.
If you need it just working use mysql comand line client? Mysql is quite easy to use in scripts.
Check out the example below
$ mysql -u root -p<password> -B <db> --execute="select * from projects"
p_id p_timestamp p_name p_manager_id p_status
1 2009-04-14 14:42:00 Test1 3 1
2 2009-04-14 14:42:13 Test2 3 1
The output should be easy to interpret as it looks like tab separated CSV. So it should be ok for most scenarios.
These may assist you:
http://www.emacswiki.org/emacs/SqlMode
http://atomized.org/2008/10/enhancing-emacs%E2%80%99-sql-mode/
Related
I have one script script.sql which I want to execute from command line using oracle and passing it two parameters, as shown below
sqlplus user/pass # script.sql my_parameter1_value my_parameter2_value
What should it be in script.sql in order to be able to run it with the parameter values?
The solution can be prepared looking at oracle blogs:
https://blogs.oracle.com/opal/sqlplus-101-substitution-variables#2_7
For the question above, the solution would be to create a script.sql like this:
DEFINE START_VALUE = &1;
DEFINE STOP_VALUE = &2;
SELECT * FROM my_table
WHERE
value BETWEN &&START_VALUE AND &&STOP_VALUE;
I wanted to run a script that would return all orders raised during the last seven days. Here's how...
the script
SELECT * FROM orders_detail WHERE order_date BETWEEN '&1' AND '&2';
EXIT;
the command
sqlplus ot/Orcl1234#xepdb1 #"/opt/oracle/oradata/Custom Scripts/orders_between_dates.sql" $(date +%d-%b-%Y -d '-7 days') $(date +%d-%b-%Y)
Hope that helps someone. Luck.
recently I started to work with db2, and created few databases.
To drop a single DB I should use db2 drop db demoDB, is there a way to drop all DBs at once?
Thanks
Taking into account the previous answer, this set of lines do the same without creating a script.
db2 list db directory | tail -n +6 | sed 'N;N;N;N;N;N;N;N;N;N;N;s/\n/ /g' | awk '$28 = /Indirect/ {print "db2 drop database "$7}' | source /dev/stdin
This filters the local databases, and executes the generated output.
(Only works in English environment)
first , i don't think there is any db2 nature way to do that. But I usually do the following thing. At start, the way to see all the databases on your instance is one of the following:
db2 list db directory
db2 list active active databases
Depends on your need ( all DBs or just the active DBs)
I'm sure there is more DBs lists you can get.(at DB2 user guide)
The way I usually drop all my DBs is by using shell script:
1. create new script by using 'vi db2_drop_all.sh' or some other way you want.
2. paste the code:
#!/bin/bash -x
for db_name in $(db2 list db directory | grep Database | \
grep name | cut -d= -f2); do
db2 drop db $db_name || true
done
exit 0
3. save changes
4. and just run the script (after you switched to your instance of course ) sh db2_drop_all.sh
Notice that in step 2 you can change the list of DBs as you wish. ( for example to db2 list active databases)
Hope it helped you. :)
I am working on a test in which I must find out the number of partitions of a table and check if it is right. If I use show partitions TableName I get all the partitions by name, but I wish to get the number of partitions, like something along the lines show count(partitions) TableName (which retuns OK btw.. so it's not good) and get 12 (for ex.).
Is there any way to achieve this??
Using Hive CLI
$ hive --silent -e "show partitions <dbName>.<tableName>;" | wc -l
--silent is to enable silent mode
-e tells hive to execute quoted query string
You could use:
select count(distinct <partition key>) from <TableName>;
By using the below command, you will get the all partitions and also at the end it shows the number of fetched rows. That number of rows means number of partitions
SHOW PARTITIONS [db_name.]table_name [PARTITION(partition_spec)];
< failed pictoral example >
You can use the WebHCat interface to get information like this. This has the benefit that you can run the command from anywhere that the server is accessible. The result is JSON - use a JSON parser of your choice to process the results.
In this example of piping the WebHCat results to Python, only the number 24 is returned representing the number of partitions for this table. (Server name is the name node).
curl -s 'http://*myservername*:50111/templeton/v1/ddl/database/*mydatabasename*/table/*mytablename*/partition?user.name=*myusername*' | python -c 'import sys, json; print len(json.load(sys.stdin)["partitions"])'
24
In scala you can do following:
sql("show partitions <table_name>").count()
I used following.
beeline -silent --showHeader=false --outputformat=csv2 -e 'show partitions <dbname>.<tablename>' | wc -l
Use the following syntax:
show create table <table name>;
This question already has an answer here:
Closed 10 years ago.
Possible Duplicate:
Select columns into local variable from sql script using shell script
im trying to write a unix script that will retrieve a parameter using sql query and run a script afterwards with this parameter.
for the time being, im just tryin to make it echo the retrieved parameter.
the sql query that works fine on toad (oracle 8) is :
select billcycle from bc_run
where billcycle not in (50,16)
and control_group_ind is null
and billseqno=6043
the above query give a number.
now the script i wrote is:
#!/bin/bash
echo "this script will print the billcycle date"
v_bc=`sqlplus -s /#bscsprod <<EOF
select billcycle from bc_run
where billcycle not in (50,16)
and control_group_ind is null
and billseqno=6043`
echo "billcycle number is $v_bc"
the result when i run the file is
billcycle number is
with no number that follows.
any ideas what's wrong ? maybe the syntax for connecting to the sql server ?
thanks
Assaf.
The duplicate question APC linked to shows a working example, but to clarify you have two problems. The first is non-fatal and is just that you don't have EOF, as Rembunator pointed out (though it's in the wrong place in that answer).
More importantly though you don't have a terminating ; in your query, so SQL*Plus won't execute it - it just exits with no output.
If you typed your original query in as the SQL*Plus command prompt it would leave you at a further prompt waiting for input, and then go back to a normal prompt if you just hit return again, without actually executing the query:
SQL> select billcycle from bc_run
2 where billcycle not in (50,16)
3 and control_group_ind is null
4 and billseqno=6043
5
SQL>
You also probably want at least some formatting of the output. So this should work:
v_bc=`sqlplus -s /#bscsprod <<EOF
set pagesize 0
select billcycle from bc_run
where billcycle not in (50,16)
and control_group_ind is null
and billseqno=6043;
EOF`
I think you should end with EOF as well:
v_bc=`sqlplus -s /#bscsprod <<EOF
select billcycle from bc_run
where billcycle not in (50,16)
and control_group_ind is null
and billseqno=6043
EOF`
Edited: Oops, as corrected by Alex Poole.
What is the best way to pass multiple values from one variable into separate records in an oracle db?
I want to take the output from:
hddlist=`iostat -Dl|awk '{print ""$1"="$(NF)}'
This returns output like this:
hdisk36=0.8
hdisk37=0.8
hdisk38=0.8
hdisk40=5.5
hdisk52=4.9
I want to insert them into a database like so:
sqlplus -s /nolog <<EOF1
connect / as sysdba
set verify off
insert into my_table ##Single Record Here
EOF1
How can I systematically separate out the values so i can create individual records that look like this:
Disk Value
--------- -------
hdisk36 0.8
hdisk37 0.8
hdisk38 0.8
hdisk40 5.5
hdisk52 4.9
I originally tried a while loop with a counter but could not seem to get it to work. An exact solution would be nice but some directional advice would be just as helpful.
Loop and generate insert statements.
sql=$(iostat -Dl | awk '{print ""$1"="$(NF)}' | while IFS== read -r k v ; do
printf 'insert into mytable (k, v) values (%s, %s);\n' "$k" "$v"
done)
This output can be passed in some manner to sqlplus, perhaps like this
sqlplus -s /nolog <<EOF1
connect / as sysdba
set verify off
$sql
EOF1
Although, depending on the line format of iostat, it might be simpler to just omit awk and parse with read directly.
You can redirect the output to a file and then use an external table
It should look something like this:
CREATE TABLE hddlist_ext_table (
disk CHAR(16),
value CHAR(3)
ORGANIZATION EXTERNAL (
TYPE ORACLE_LOADER DEFAULT DIRECTORY tab_dir
ACCESS PARAMETERS (RECORDS DELIMITED BY NEWLINE
FIELDS TERMINATED BY '=')
LOCATION ('your_file_name'));
Then you can either use this table for your data or insert-select from it to your table;
insert into my_table
select disk, value from hddlist_ext_table;
You can insert multiple rows in a single SQL statement in Oracle like this
INSERT ALL
INTO mytable (column1, column2, column3) VALUES ('val1.1', 'val1.2', 'val1.3')
INTO mytable (column1, column2, column3) VALUES ('val2.1', 'val2.2', 'val2.3')
INTO mytable (column1, column2, column3) VALUES ('val3.1', 'val3.2', 'val3.3')
SELECT * FROM dual;
If you intend to run this script automatically at intervals to then see the results of each disk, you will probably need additional columns to hold the date and time.
You might also look at sqlldr as you can specify a control file telling it what your data contains and then this will load the data into a table. It is more suited to the purpose if you are loading lots of data than SQL Plus.