how to compare array of String with column of a table

7 Message(s) by 3 Author(s) originally posted in mysql discussion

From: kath

Date: Friday, October 26, 2007

Hi,
I have a array

1. <programming> A collection of identically typed data items
	distinguished by their indices (or "subscripts").  The number
	of dimensions an array can have depends on the language but is
	usually unlimited.

	An array is a kind of {aggregate} data type.  A single
	ordinary variable (a "{scalar}") could be considered as a
	zero-dimensional array.  A one-dimensional array is also known
	as a "{vector}".

	A reference to an array element is written something like
	A[i,j,k] where A is the array name and i, j and k are the
	indices.  The {C} language is peculiar in that each index is
	written in separate brackets, e.g. A[i][j][k].  This expresses
	the fact that, in C, an N-dimensional array is actually a
	vector, each of whose elements is an N-1 dimensional array.

	Elements of an array are usually stored contiguously.
	Languages differ as to whether the leftmost or rightmost index
	varies most rapidly, i.e. whether each row is stored
	contiguously or each column (for a 2D array).

	Arrays are appropriate for storing data which must be accessed
	in an unpredictable order, in contrast to {lists} which are
	best when accessed sequentially.

	See also {associative array}.

	2. <architecture> A {processor array}, not to be confused with
	an {array processor}.

	(1995-01-25)

of string

<programming> A sequence of {data} values, usually {bytes},
	which usually stand for {characters} (a "character string").
	The {mapping} between values and characters is determined by
	the {character set} which is itself specified implcitly or
	explicitly by the environment in which the string is being
	interpreted.

	The most common character set is {ASCII} but, since the late
	1990s, there has been increased interest in larger character
	sets such as {Unicode} where each character is represented by
	more than eight {bits}.

	Most programming languages consider strings (e.g.
	"124:shabooya:\n", "hello world") basically distinct from
	numbers which are typically stored in fixed-length {binary} or
	{floating-point} representation.

	A {bit string} is a sequence of {bits}.

	(1999-12-21)

(say array is of length 1000). I want to
compare those string in array with one table

<database> A collection of {records} in a {relational database}.

	(1997-06-04)

column
- whether that table column has a string
if yes
don'thing.
if no
then insert that string into table.
- whether table has obsolete row

<data, database, programming> An {ordered set} of {fields},
	usually stored contiguously.  The term is used with similar
	meaning in several different contexts.  In a file, a "record"
	probably has some fixed length, in contrast to a "line" which
	may have any length and is terminated by some {End Of Line}
	sequence).  A {database} record is also called a "row".  In a
	{spreadsheet} it is always called a "row".  Some programming
	languages use the term to mean a type composed of fields of
	several other types ({C} calls this a "{struct}").

	In all these cases, a record represents an entity with certain
	field values.

	Fields may be of a fixed width ({bits} or {characters}) or
	they may be separated by a {delimiter} character, often
	{comma} ({CSV}) or {HT} ({TSV}).

	In a database the list of values of a given field from all
	records is called a column.

	(2002-03-22)

i.e, the one present in table and
not in array
then delete

1. <operating system> (Or "erase") To make a file
	inaccessible.

	Usually this operation only deletes information from the
	tables the {file system} uses to locate named files; the
	file's contents still exist on {disk} and can sometimes be
	recovered by scanning the whole disk for strings which are
	known to have been in the file.  Files created subsequently on
	the same disk are quite likely to reuse the same blocks and
	thus overwrite the deleted file's data permanently.

	2. <character> The {control character} with {ASCII} code 127.
	Usually entering this character from the keyboard deletes the
	last character typed from the {input buffer}.  Sadly there is
	great confusion between {operating systems} and keyboard
	manufacturers as to whether this function should be assigned
	to the delete or {backspace} key/character.

	The choice of code 127 (binary 1111111) is not arbitrary but
	dates back to the use of {paper tape} for input.  The delete
	key rewound the tape by one character and punched out all
	seven holes, thus obliterating whatever character was there
	before.  The tape reading software ignored any delete
	characters in the input.

	(1996-12-01)

that row.

How do I go about this, because I see, it isn't feasible

<algorithm> A description of an {algorithm} that takes
	{polynomial} time (that is, for a problem set of size N, the
	resources required to solve the problem can be expressed as
	some polynomial involving N).

	Problems that are "feasible" are said to be "in P" where P is
	polynomial time.  Problems that are "possible" but not
	"feasible" are said to be "in NP".

	(2001-04-12)

to loop

<programming> A sequence of {instructions} that the
	{processor} repeats, either until some condition is met, or
	indefinitely.

	In an {structured language} (e.g. {C}, {Pascal}, {BASIC}, or
	{Fortran}), a loop is usually achieved with {for loop}, {while
	loop} or {repeat loop} constructs.

	In other languages these constructs may be synthesised with a
	{jump} ({assembly language}) or a {GOTO} (early Fortran or
	BASIC).

	(1999-05-06)

through array and search table to find new string OR loop through each
row from table to find some obsolete row

How can I accomplish this task more feasibly(without running query

1. <database, information science> A user's (or {agent}'s)
	request for information, generally as a formal request to a
	{database} or {search engine}.

	{SQL} is the most common {database query language}.

	2. <character> {question mark}.

	(1997-04-09)

for
each string, for comparission)? Is there any way to find this kind of
problem. I would've been easy if I had to compare two tables(with
UNION and INTERSECT), but it isn't the case.thanks,
kath.

From: Captain Paralytic

Date: Friday, October 26, 2007

wrote in message:

Hi, I have a array of string(say array is of length 1000). I want to
compare those string in array with one table column
- whether that table column has a string
if yes
don'thing.
if no
then insert that string into table.
- whether table has obsolete row i.e, the one present in table and
not in array
then delete that row.
How do I go about this, because I see, it isn't feasible to loop
through array and search table to find new string OR loop through each
row from table to find some obsolete row
How can I accomplish this task more feasibly(without running query for
each string, for comparission)? Is there any way to find this kind of
problem. I would've been easy if I had to compare two tables(with
UNION and INTERSECT), but it isn't the case.
thanks,
kath.

Load the array into a temporary table and use a MySQL intersect
construct (http://www.bit

<unit> (b) {binary} digit.

	The unit of information; the amount of information obtained by
	asking a yes-or-no question; a computational quantity that can
	take on one of two values, such as false and true or 0 and 1;
	the smallest unit of storage - sufficient to hold one bit.

	A bit is said to be "set" if its value is true or 1, and
	"reset" or "clear" if its value is false or 0.  One speaks of
	setting and clearing bits.  To {toggle} or "invert" a bit is
	to change it, either from 0 to 1 or from 1 to 0.

	The term "bit" first appeared in print in the computer-science
	sense in 1949, and seems to have been coined by the eminent
	statistician, {John Tukey}.  Tukey records that it evolved
	over a lunch table as a handier alternative to "bigit" or
	"binit".

	See also {flag}, {trit}, {mode bit}, {byte}, {word}.

	[{Jargon File}]

	(2002-01-22)

bybit.dk/carsten/blog/?p=71)

From: Rik Wasmus

Date: Friday, October 26, 2007

wrote in message:

Hi, I have a array of string(say array is of length 1000). I want to
compare those string in array with one table column
- whether that table column has a string
if yes
don'thing.
if no
then insert that string into table.
- whether table has obsolete row i.e, the one present in table and
not in array
then delete that row.
How do I go about this, because I see, it isn't feasible to loop
through array and search table to find new string OR loop through each
row from table to find some obsolete row
How can I accomplish this task more feasibly(without running query for
each string, for comparission)? Is there any way to find this kind of
problem. I would've been easy if I had to compare two tables(with
UNION and INTERSECT), but it isn't the case.

Aside from the temporary table solution

<jargon> A {marketroid} term for something he wants to sell
	you without bothering you with the often dizzying distinctions
	between {hardware}, {software}, {services}, {applications},
	{file formats}, companies, brand names and {operating
	systems}.

	"{Flash} is a perfect image-streaming solution."  "What is
	it?"  "Um...  about a thousand dollars."

	See also: {technology}.

	(1998-07-07)

given, this can also be done using
two queries:

0: set up table:
Give the field

<data, database> An area of a {database} {record}, or
	{graphical user interface} {form}, into which a particular
	item of data is entered.

	Example usage: "The telephone number field is not really a
	numerical field", "Why do we need a four-digit field for the
	year?".

	A {database} {column} is the set of all instances of a given
	field from all records in a {table}.

	(1999-04-26)

a UNIQUE

<language> A {portable} {job control language}.

	["The UNIQUE Command Language - Portable Job Control",
	I.A. Newman, Proc DATAFAIR 73, 1973, pp. 353-357].

	(1994-11-22)

index

(Plural "indices" or "indexes")

	1. <programming> A number used to select an element of a list,
	vector, {array} or other sequence.  Such indices are nearly
	always non-negative integers but see {associative array}.

	2. <database> See {inverted index}.  [Other kinds?]

	3. <World-Wide Web> A {search engine}.

	4. <World-Wide Web> A {subject index}.

	4. <jargon> See {coefficient of X}.

	[{Jargon File}]

	(1997-04-09)

1: delete:
DELETE FROM tablename WHERE fieldname NOT IN ('list

<data> A data structure holding many values, possibly of
	different types, which is usually accessed sequentially,
	working from the head to the end of the tail - an "ordered
	list".  This contrasts with a (one-dimensional) {array}, any
	element of which can be accessed equally quickly.

	Lists are often stored using a cell and pointer arrangement
	where each value is stored in a cell along with an associated
	pointer to the next cell.  A special pointer, e.g. zero, marks
	the end of the list.  This is known as a (singly) "linked
	list".  A doubly linked list has pointers from each cell to
	both next and previous cells.

	An unordered list is a {set}.

	(1998-11-12)

','of','values');
2: insert:
INSERT IGNORE INTO tablename (fieldname) VALUES ('list'),('of'),('values');
(allthough INSERT ... ON DUPLICATE KEY UPDATE ... could be more suited to
your needs)

From the manual:
If you use the IGNORE key

1. <database> A value used to identify a {record} in a
	database, derived by applying some fixed function to the
	record.  The key is often simply one of the {fields} (a
	{column} if the database is considered as a table with records
	being rows, see "{key field}").  Alternatively the key may be
	obtained by applying some function, e.g. a {hash function}, to
	one or more of the fields.  The set of keys for all records
	forms an {index}.  Multiple indexes may be built for one
	database depending on how it is to be searched.

	2. <cryptography> A value which must be fed into the
	{algorithm} used to decode an encrypted message in order to
	reproduce the original {plain text}.  Some encryption schemes
	use the same (secret) key to encrypt and decrypt a message,
	but {public key encryption} uses a "private" (secret) key and
	a "public" key which is known by all parties.

	3. <hardware> An electromechanical {keyboard} button.

	(2003-07-04)

word, error

1. A discrepancy between a computed, observed, or measured
	value or condition and the true, specified, or theoretically
	correct value or condition.

	2. <programming> A mental mistake made by a programmer that
	may result in a program {fault}.

	3. (verb) What a program does when it stops as result of a
	programming error.

	(2000-03-28)

s that occur while executing the
INSERT statement are treated as warnings instead. For example, without
IGNORE, a row that duplicates an existing UNIQUE index or PRIMARY KEY
value in the table causes a duplicate-key error and the statement is
abort

<programming> To terminate a program or {process} abnormally
	and usually suddenly, with or without {diagnostic}
	information.  "My program aborted", "I aborted the
	transmission".  The noun form in computing is "abort", not
	"abortion", e.g. "We've had three aborts over the last two
	days".

	If a {Unix} {kernel} aborts it is known as a {panic}.

	(1997-01-07)

ed. With IGNORE, the row still isn't inserted, but no error is
issued. Data conversions that'd trigger

<database> An action causing the automatic invocation of a
	procedure, for instance to preserve {referential integrity}.
	A triggers goes into effect when a user attempts to modify
	data with an insert, delete, or update command.  A trigger can
	instruct the system to take any number of actions when a
	specified change is attempted.  By preventing incorrect,
	unauthorized, or inconsistent changes to data, triggers help
	maintain the integrity of the database.

	[Sybase SQL Server Release 10.0 Transact-SQL User's Guide].

	(1995-02-22)

errors abort the statement if
IGNORE isn't specified. With IGNORE, invalid values are adjusted to the
closest values and inserted; warnings are produced but the statement does
not abort. You can determine with the mysql_info() C API

<programming> (API, or "application programming interface")
	The interface (calling conventions) by which an {application
	program} accesses {operating system} and other services.  An
	API is defined at {source code} level and provides a level of
	{abstraction} between the application and the {kernel} (or
	other privileged utilities) to ensure the {portability} of the
	code.

	An API can also provide an interface between a {high level
	language} and lower level utilities and services which were
	written without consideration for the {calling conventions}
	supported by compiled languages.  In this case, the API's main
	task may be the translation of parameter lists from one format
	to another and the interpretation of {call-by-value} and
	{call-by-reference} arguments in one or both directions.

	(1995-02-15)

(application programming

1. The art of debugging a blank sheet of paper (or, in these
	days of on-line editing, the art of debugging an empty file).

	2. A pastime similar to banging one's head against a wall, but
	with fewer opportunities for reward.

	3. The most fun you can have with your clothes on (although
	clothes are not mandatory).

	[{Jargon File}]

	(2003-02-12)

interface)function how many
rows were actually inserted into the table.

If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that'd
cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the
old row is performed. See Section 13.2.4.3, 'INSERT ... ON DUPLICATE KEY
UPDATE Syntax'. ON DUPLICATE KEY UPDATE was added in MySQL 4.1.0.
--
Rik Wasmus

From: Captain Paralytic

Date: Friday, October 26, 2007

wrote in message:
wrote in message:
> Hi,
> I have a array of string(say array is of length 1000). I want to
> compare those string in array with one table column
> - whether that table column has a string
> if yes
> don'thing.
> if no
> then insert that string into table.
> - whether table has obsolete row i.e, the one present in table and
> not in array
> then delete that row.
> How do I go about this, because I see, it isn't feasible to loop
> through array and search table to find new string OR loop through each
> row from table to find some obsolete row
> How can I accomplish this task more feasibly(without running query for
> each string, for comparission)? Is there any way to find this kind of
> problem. I would've been easy if I had to compare two tables(with
> UNION and INTERSECT), but it isn't the case.
Aside from the temporary table solution given, this can also be done using
two queries:
0: set up table:
Give the field a UNIQUE index
1: delete:
DELETE FROM tablename WHERE fieldname NOT IN ('list','of','values');
2: insert:
INSERT IGNORE INTO tablename (fieldname) VALUES ('list'),('of'),('values');
(allthough INSERT ... ON DUPLICATE KEY UPDATE ... could be more suited to
your needs)
From the manual:
If you use the IGNORE keyword, errors that occur while executing the
INSERT statement are treated as warnings instead. For example, without
IGNORE, a row that duplicates an existing UNIQUE index or PRIMARY KEY
value in the table causes a duplicate-key error and the statement is
aborted. With IGNORE, the row still isn't inserted, but no error is
issued. Data conversions that'd trigger errors abort the statement if
IGNORE isn't specified. With IGNORE, invalid values are adjusted to the
closest values and inserted; warnings are produced but the statement does
not abort. You can determine with the mysql_info() C API (application programming interface)function how many
rows were actually inserted into the table.
If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that'd
cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the
old row is performed. See Section 13.2.4.3, 'INSERT ... ON DUPLICATE KEY
UPDATE Syntax'. ON DUPLICATE KEY UPDATE was added in MySQL 4.1.0.
--
Rik Wasmus- Hide quoted text

1. Executable code, especially a "pure code" portion shared
	between multiple instances of a program running in a
	{multitasking} {operating system}.

	Compare {English}.

	2. Textual material in the mainstream sense; data in ordinary
	{ASCII} or {EBCDIC} representation (see {flat ASCII}).  "Those
	are text files; you can review them using the editor."

	These two contradictory senses confuse hackers too.

	[{Jargon File}]

	(1995-03-16)

-
- Show quoted text -

Depending on teh size of the table, I'd expect

<language, tool> A {Unix} tool written in {Tcl} and a {script
	language} for automating the operation of {interactive}
	applications such as {telnet}, {FTP}, {passwd}, {fsck},
	{rlogin}, {tip}, etc..  Expect can feed input to other
	programs and perform {pattern matching} on their output.  It
	is also useful for testing these applications.  By adding
	{Tk}, you can also wrap interactive applications in {X11}
	{GUIs}.

	{Home (http://expect.nist.gov/)}.

	["expect: Scripts for Controlling Interactive Tasks", Don
	Libes, Comp Sys 4(2), U Cal Press Journals, Nov 1991].

	(1997-06-09)

the NOT IN
('list','of','values') to be a bit slow (with 1000 values). I'd be
interesting to know the relative performance.

From: Rik Wasmus

Date: Friday, October 26, 2007

On Fri, 26 Oct 2007 16:27:48 +0200, Captain Paralytic
wrote in message:
wrote in message:
wrote in message:
> I have a array of string(say array is of length 1000). I want to
> compare those string in array with one table column
> - whether that table column has a string
> if yes
> don'thing.
> if no
> then insert that string into table.
> - whether table has obsolete row i.e, the one present in table and
> not in array
> then delete that row.

> How can I accomplish this task more feasibly(without running query for
> each string, for comparission)?

Aside from the temporary table solution given, this can also be done
using
two queries:

0: set up table:
Give the field a UNIQUE index
1: delete:
DELETE FROM tablename WHERE fieldname NOT IN ('list','of','values');
2: insert:
INSERT IGNORE INTO tablename (fieldname) VALUES
('list'),('of'),('values');
(allthough INSERT ... ON DUPLICATE KEY UPDATE ... could be more suited
to
your needs)

Depending on teh size of the table, I'd expect the NOT IN
('list','of','values') to be a bit slow (with 1000 values). I'd be
interesting to know the relative performance.

It'd certainly depend on that. The kind of solution I offered is
easily usable with for instance

<programming> An individual {object} of a certain {class}.
	While a class is just the type definition, an actual usage of
	a class is called "instance".  Each instance of a class can
	have different values for its {instance variables}, i.e. its
	{state}.

	(1998-03-06)

forms

1. <programming> {fill-out form}.

	2. <library> (Xforms) A {GUI} component library for {X11}.

	(1998-03-24)

on the web, where one'd some
properties of an object

<object-oriented> In {object-oriented programming}, an
	instance of the data structure and behaviour defined by the
	object's {class}.  Each object has its own values for the
	{instance variables} of its class and can respond to the
	{methods} defined by its class.

	For example, an object of the "Point" class might have
	instance variables "x" and "y" and might respond to the "plot"
	method by drawing a dot on the screen at those coordinates.

	(2004-01-26)

as checkboxes, which the user could check &
uncheck (thus resulting in formentioned array and requirements). That
would for UI/clarities sake have to be limited to no more then 20 or 30
choices. In that case this'd be perfectly suitable, especially with
the UNIQUE key on the column.

When the data

<data, data processing, jargon> /day't*/ (Or "raw data")
	Numbers, {characters}, {images}, or other method of recording,
	in a form which can be assessed by a human or (especially)
	input into a {computer}, stored and {processed} there, or
	transmitted on some {digital channel}.  Computers nearly
	always represent data in {binary}.

	Data on its own has no meaning, only when interpreted by some
	kind of {data processing system} does it take on meaning and
	become {information}.

	People or computers can find patterns in data to perceive
	information, and information can be used to enhance
	{knowledge}.  Since knowledge is prerequisite to wisdom, we
	always want more data and information.  But, as modern
	societies verge on {information overload}, we especially need
	better ways to find patterns.

	1234567.89 is data.

	"Your bank balance has jumped 8087% to $1234567.89" is
	information.

	"Nobody owes me that much money" is knowledge.

	"I'd better talk to the bank before I spend it, because of
	what has happened to other people" is wisdom.

	(1999-04-30)

is indeed over 100's of rows or so I'd definitely look into
the temporary table solution.
--
Rik Wasmus

From: kath

Date: Friday, October 26, 2007

Load the array into a temporary table and use a MySQL intersect

I wouldn't consider this is better idea because, there creating table
inserting values will take lot of SQL

<language, database, standard> /S Q L/ An industry-standard
	language for creating, updating and, querying {relational
	database management systems}.

	SQL was developed by {IBM} in the 1970s for use in {System R}.
	It is the {de facto standard} as well as being an {ISO} and
	{ANSI} {standard}.  It is often embedded in general purpose
	programming languages.

	The first SQL standard, in 1986, provided basic language
	constructs for defining and manipulating {tables} of data; a
	revision in 1989 added language extensions for {referential
	integrity} and generalised {integrity} {constraints}.  Another
	revision in 1992 provided facilities for {schema} manipulation
	and {data administration}, as well as substantial enhancements
	for data definition and data manipulation.

	Development is currently underway to enhance SQL into a
	computationally complete language for the definition and
	management of {persistent}, complex objects.  This includes:
	generalisation and specialisation hierarchies, {multiple
	inheritance}, user defined {data types}, {triggers} and
	{assertions}, support for {knowledge based systems},
	{recursive query expressions}, and additional data
	administration tools.  It also includes the specification of
	{abstract data types} (ADTs), object identifiers, {methods},
	{inheritance}, {polymorphism}, {encapsulation}, and all of the
	other facilities normally associated with object data
	management.

	The emerging {SQL3} standard is expected to be complete in
	1998.

	According to Allen G. Taylor, SQL does _not_ stand for
	"Structured Query Language".  That, like "SEQUEL" (and its
	pronunciation /see'kw*l/), was just another unofficial name
	for a precursor of SQL.  However, the IBM SQL Reference manual
	for DB2 and Craig Mullins's "DB2 Developer's Guide" say SQL
	_does_ stand for "Structured Query Language".

	{SQL Standards (http://www.jcc.com/sql_stnd.html)}.

	{An SQL parser
	(ftp://ftp.ora.com/published/oreilly/nutshell/lexyacc/)} is
	described in "Lex & Yacc", by Levine, Mason & Brown published
	by O'Reilly.

	{The 1995 SQL Reunion: People, Projects, and Politics
	(http://www.mcjones.org/System_R/SQL_Reunion_95/)}.

	["A Guide to the SQL Standard", C.J. Date, A-W 1987].

	["SQL for Dummies", Allen G. Taylor, IDG Books Worldwide].

	(2005-11-17)

queries(statements).
- CREATE statement = 1
- INSERT statement = depending on the size of array
- DELETE statement = 1

0: set up table:
Give the field a UNIQUE index
1: delete:
DELETE FROM tablename WHERE fieldname NOT IN ('list','of','values');
2: insert:
INSERT IGNORE INTO tablename (fieldname) VALUES ('list'),('of'),('values');
(allthough INSERT ... ON DUPLICATE KEY UPDATE ... could be more suited to
your needs)

Looks good. But I have doubt again, I am using JAVA to do this task. I
do not know exactly whether I can use String[] (array of String in
JAVA) in the DELETE query you've mentioned. I can construct a String
out list of String so that I can query, is it right way?.

If I get how to form a query for list of values, for above DELETE then
I as well get idea to INSERT query.

How do I form a query for list of String in JAVA?.

Thanks for your input,
best regards,
kath.

From: Rik Wasmus

Date: Friday, October 26, 2007

wrote in message:=> Load the array into a temporary table and use a MySQL intersect

I wouldn't consider this is better idea because, there creating table=

inserting values will take lot of SQL queries(statements).
- CREATE statement =3D 1
- INSERT statement =3D depending on the size of array

No, 1 INSERT statement'd do it.

- DELETE statement =3D 1

A lot of SQL queries (actually this is quite modest amount) does not =

necessarily mean it takes longer.

0: set up table:
Give the field a UNIQUE index
1: delete:
DELETE FROM tablename WHERE fieldname NOT IN ('list','of','values');=

2: insert:
INSERT IGNORE INTO tablename (fieldname) VALUES =

('list'),('of'),('values');
(allthough INSERT ... ON DUPLICATE KEY UPDATE ... could be more suit=
ed =

to
your needs)
Looks good. But I have doubt again, I am using JAVA to do this task. I=

do not know exactly whether I can use String[] (array of String in
JAVA) in the DELETE query you've mentioned. I can construct a String=

out list of String so that I can query, is it right way?.
If I get how to form a query for list of values, for above DELETE then=

I as well get idea to INSERT query.
How do I form a query for list of String in JAVA?.

Personally I stay as far away from JAVA as I can, put I assume an array =
in =

JAVA can be imploded/joined somehow to a string, which'd make creati=
ng =

the query string quite easy.
-- =

Rik Wasmus

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