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Top Forums Shell Programming and Scripting to extract string from main string and string comparison Post 302573926 by vivek d r on Wednesday 16th of November 2011 07:17:44 AM
Old 11-16-2011
my goal is to write a shell script which takes two mysql dump files(one is latest dump which has new changes to be made and other one is older mysql dump) the script compares both the files and and give the delta (that is changed to to be made ) as output. the changes in the sense.. new mysql dump file has two more columns added in the table blahblahblah so the scipt finds out which are the columns missing and from which table and writes alter table query to that particular table. i am stuck in the part where i need to extract table wise from the file and also in comparison between files. right now i have wrote shell script which just prints out lines missing from one file compared to other.. its copy is shown in
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https://www.unix.com/shell-programming-scripting/171076-shell-scripting.html#post302573569

thanks for replying in short time

---------- Post updated at 03:45 PM ---------- Previous update was at 03:41 PM ----------

this is required for my project since currently we use mysql testbench to get this delta changes of database compared to new changes. and use this delta changes file to alter the old database so that it reflects all the new changes. but i want to avoid using testbench for this function and write a shell script which performs its functions.

---------- Post updated at 05:47 PM ---------- Previous update was at 03:45 PM ----------

Quote:
Originally Posted by ahamed101
Whatever you have mentioned can be done, but what is your ultimate goal?...

Code:
table_name=$( awk -F\` '/CREATE TABLE/{print $2}' input_file )

--ahamed
the above query works good thanks.. :-)
consider the below code

Code:
`id` int(11) NOT NULL AUTO_INCREMENT,
`action` enum('Change','Delete','Add','Locked','Unlocked') COLLATE utf8_unicode_ci DEFAULT 'Change',
`date` datetime DEFAULT NULL,

`reserved1` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`reserved2` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`zoneId` int(11) DEFAULT NULL,

these are the column names in the earlier mentioned table. how to extract these column names dynamically cause i want to use it in a function so if i send either
`reserved2` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL
or
`zoneId` int(11) DEFAULT NULL
(the above two line will be stored in the variable.. i am using while loop to read from file so technically in first run one column will be held in $line )
it should extract reserved2 or zoneid respectively.. how to do it..?
 

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INSERT(7)							   SQL Commands 							 INSERT(7)

NAME
INSERT - create new rows in a table SYNOPSIS
INSERT INTO table [ ( column [, ...] ) ] { DEFAULT VALUES | VALUES ( { expression | DEFAULT } [, ...] ) | SELECT query } INPUTS table The name (optionally schema-qualified) of an existing table. column The name of a column in table. DEFAULT VALUES All columns will be filled by null values or by values specified when the table was created using DEFAULT clauses. expression A valid expression or value to assign to column. DEFAULT This column will be filled in by the column DEFAULT clause, or NULL if a default is not available. query A valid query. Refer to the SELECT statement for a further description of valid arguments. OUTPUTS INSERT oid 1 Message returned if only one row was inserted. oid is the numeric OID of the inserted row. INSERT 0 # Message returned if more than one rows were inserted. # is the number of rows inserted. DESCRIPTION
INSERT allows one to insert new rows into a table. One can insert a single row at a time or several rows as a result of a query. The col- umns in the target list may be listed in any order. Each column not present in the target list will be inserted using a default value, either a declared DEFAULT value or NULL. PostgreSQL will reject the new column if a NULL is inserted into a column declared NOT NULL. If the expression for each column is not of the correct data type, automatic type coercion will be attempted. You must have insert privilege to a table in order to append to it, as well as select privilege on any table specified in a WHERE clause. USAGE
Insert a single row into table films: INSERT INTO films VALUES ('UA502','Bananas',105,'1971-07-13','Comedy',INTERVAL '82 minute'); In this second example the last column len is omitted and therefore it will have the default value of NULL: INSERT INTO films (code, title, did, date_prod, kind) VALUES ('T_601', 'Yojimbo', 106, DATE '1961-06-16', 'Drama'); In the third example, we use the DEFAULT values for the date columns rather than specifying an entry. INSERT INTO films VALUES ('UA502','Bananas',105,DEFAULT,'Comedy',INTERVAL '82 minute'); INSERT INTO films (code, title, did, date_prod, kind) VALUES ('T_601', 'Yojimbo', 106, DEFAULT, 'Drama'); Insert a single row into table distributors; note that only column name is specified, so the omitted column did will be assigned its default value: INSERT INTO distributors (name) VALUES ('British Lion'); Insert several rows into table films from table tmp: INSERT INTO films SELECT * FROM tmp; Insert into arrays (refer to the PostgreSQL User's Guide for further information about arrays): -- Create an empty 3x3 gameboard for noughts-and-crosses -- (all of these queries create the same board attribute) INSERT INTO tictactoe (game, board[1:3][1:3]) VALUES (1,'{{"","",""},{},{"",""}}'); INSERT INTO tictactoe (game, board[3][3]) VALUES (2,'{}'); INSERT INTO tictactoe (game, board) VALUES (3,'{{,,},{,,},{,,}}'); COMPATIBILITY
SQL92 INSERT is fully compatible with SQL92. Possible limitations in features of the query clause are documented for SELECT [select(7)]. SQL - Language Statements 2002-11-22 INSERT(7)
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