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SQL Update Statement
Course: MIS 333, Fall 2011School: University of Texas
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Word Count: 415
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table_name SQLUpdateStatement Allowsustoupdatetherecordsalreadypresentinthedatabase. Syntax: update set field1 = 'new value' [where field2 = 'field2_value'] updatestatementlikeinsertstatementtakes3arguments.table_nameisthe nameofthetableyouwanttoupdate,field1isthenameofthefield(column) whosevalueyouwantupdatedand'newvalue'isthenewvaluethatfield1will...
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table_name SQLUpdateStatement
Allowsustoupdatetherecordsalreadypresentinthedatabase.
Syntax:
update set field1 = 'new value'
[where field2 = 'field2_value']
updatestatementlikeinsertstatementtakes3arguments.table_nameisthe
nameofthetableyouwanttoupdate,field1isthenameofthefield(column)
whosevalueyouwantupdatedand'newvalue'isthenewvaluethatfield1will
contain.Notewhereclauseisoptional,itisusedtopickonespecificrecordto
updatefromthewholecolumn.FollowingexamplewillexplainwhatImean.
Example
Khan'
update books set title = 'Update Records' where author = 'Faisal
Theaboveupdatestatementwillchangethevalueoftitlefieldin
thebookstableto'UpdateRecords'whereauthorfieldcontains'FaiaslKhan'.
Thusalltitleswillbeconvertedto'UpdateRecords'wheretheauthorname
inauthorfieldis'FaisalKhan'.
' Before running the update statement
Table Name = books
Fields
Values
author
Faisal Khan
title
Add Records
' After running the update statement
Table Name = books
Fields
Values
author
Faisal Khan
title
Update Records
Nowsincewehaveseenhowtodealwithupdatestatementandhowto
updaterecordsinthedatabase,itistimetomoveontoactuallylookatthe
ConnectionandRecordsetObjectonhowtoupdatetherecordswithASP.
Wehavetwooptionstoupdatedatabaserecordswith,oneiswithConnection
ObjectusingupdateSQLstatementandtheotheronewithRecordsetObject.
Asyouwillsee,updatingrecordsisaseasyasaddingorselectingrecords
fromthedatabaseandifyouhavereadtheAddingDatatothe
Databasetutorialthenyouwillfindthatthecodeisalmostthesamewithjusta
slighttochangetoupdatetherecordsinsteadofaddingit.
ViaRecordsetObject
RecordsetObjectoffersanothereasywaytoupdaterecords.Hereishowweupdate
recordswithRecordsetObject:
<%
' Setting variables
Dim rs, data_source
data_source = myDSN
' Creating Recordset Object and opening the database
Set rs = Server.CreateObject("ADODB.Recordset")
' Lets open books table
rs.Open "books", data_source, 1, 2, adCmdTableDirect
' No rs.AddNew command needed here since we are only
' updating the records
' Filtering records so that we get only those records
' where author = 'Faisal Khan'
rs.Filter = "author = 'Faisal Khan'"
' Now updating records
rs("title") = "Update Records"
rs.Update
' Done. Now Close the Connection
rs.Close
Set rs = Nothing
%>
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