Common Database Routines - SQL Source Code in ASP

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Home » ASP Home » SQL Home » Common Database Routines

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Title	Common Database Routines
Description	To assist in interfacing with databases. This script can format variables and return SQL formats. Such as double quoting apposterphies and surrounding strings with quotes, Returning NULL for invalid data types, trimming strings so they do not exceed maximum lengths. This also has some functions so that you can open and close databases more conveiently with just one line of code. You can query a database and get an Array as well with some code.
Category	ASP » SQL
Hits	363645
Code	Select and Copy the Code
<!--METADATA Type="TypeLib" NAME="Microsoft ActiveX Data Objects 2.0 Library" UUID="{00000200-0000-0010-8000-00AA006D2EA4}" VERSION="2.0"--> <% ' Setup the ConnectionString Dim sCONNECTION_STRING sCONNECTION_STRING = "DRIVER=Microsoft Access Driver (.mdb);DBQ=D:inetpubwwwrootincdatadatabase.mdb;" Dim oConn '--------------------------------------- ' Function DBConnOpen(ByRef aoConnObj) ' This routine connects To a database and returns ' weather or Not it was successful ' Prepare For any errors that may occur While connecting To the database On Error Resume Next ' Create a connection object Set aoConnObj = Server.CreateObject("ADODB.Connection") ' Open a connection To the database Call aoConnObj.Open(sCONNECTION_STRING) ' if any errors have occured If Err Then ' Clear errors Err.Clear ' Release connection object Set aoConnObj = Nothing ' Return unsuccessful results DBConnOpen = False ' Else errors did Not occur Else ' Return successful results DBConnOpen = True End If ' Err End Function ' DBConnOpen '--------------------------------------- ' Public Function DBConnClose(ByRef aoConnObj) ' This routine closes the database connection and releases objects ' from memory ' if the connection variable has been defined as an object If IsObject(aoConnObj) Then ' if the connection is open If aoConnObj.State = adStateOpen Then ' Close the connection aoConnObj.Close ' Return positive Results DBConnClose = True End If ' aoConnObj.State = adStateOpen ' Release connection object Set aoConnObj = Nothing End If ' IsObject(aoConnObj) End Function ' DBConnClose '--------------------------------------- ' Public Function SetData(ByRef asSQL, ByRef avDataAry) ' This routine acquires data from the database Dim loRS ' ADODB.Recordset Object ' Create Recordset Object Set loRS = Server.CreateObject("ADODB.Recordset") ' Prepare For errors when opening database connection On Error Resume Next ' if a connection object has been defined If IsObject(oConn) Then ' if the connection is open If oConn.State = adStateOpen Then ' Acquire data With connection object Call loRS.Open(asSQL, oConn, adOpenForwardOnly, adLockReadOnly) ' Else the connection is closed Else ' Set the ConnectionString Call SetConnectionString(csConnectionString) ' if atempt To open connection succeeded If DBConnOpen() Then ' Acquire data With connection object Call loRS.Open(asSQL, oConn, adOpenForwardOnly, adLockReadOnly) ' Return connection object To closed state Call DBConnClose() End If ' DBConnOpen() End If ' aoConn.State = adStateOpen ' Else active connection is the ConnectionString Else ' Acquire data With ConnectionString Call loRS.Open(asSQL, sCONNECTION_STRING, adOpenForwardOnly, adLockReadOnly) End If ' IsObject(oConn) ' if errors occured If Err Then Response.Write "<HR color=red>" & Err.description & "<HR color=red>" & asSQL & "<HR color=red>" ' Clear the Error Err.Clear ' if the recorset is open If loRS.State = adStateOpen Then ' Close the recorset loRS.Close End If ' loRS.State = adStateOpen ' Release Recordset from memory Set loRS = Nothing ' Return negative results SetData = False ' Exit Routine Exit Function End If ' Err ' Return positve results SetData = True ' if data was found If Not loRS.EOF Then ' Pull data into an array avDataAry = loRS.GetRows End If ' Not loRS.EOF ' Close Recordset loRS.Close ' Release object from memory Set loRS = Nothing End Function ' SetData '--------------------------------------- ' ' SQL Preperations are used to prepare v ' ariables for SQL Queries. If ' invalid data is passed to these routin ' es, NULL values or Default Data ' is returned to keep your SQL Queries f ' rom breaking from users breaking ' datatype rules. '--------------------------------------- ' Public Function SQLPrep_s(ByVal asExpression, ByRef anMaxLength) ' if maximum length is defined If anMaxLength > 0 Then ' Trim expression To maximum length asExpression = Left(asExpression, anMaxLength) End If ' anMaxLength > 0 ' Double quote SQL quote characters asExpression = Replace(asExpression, "'", "''") ' if Expression is Empty If asExpression = "" Then ' Return a NULL value SQLPrep_s = "NULL" ' Else expression is Not empty Else ' Return quoted expression SQLPrep_s = "'" & asExpression & "'" End If ' asExpression End Function ' SQLPrep_s '--------------------------------------- ' Public Function SQLPrep_n(ByVal anExpression) ' if expression numeric If IsNumeric(anExpression) And Not anExpression = "" Then ' Return number SQLPrep_n = anExpression ' Else expression Not numeric Else ' Return NULL SQLPrep_n = "NULL" End If ' IsNumeric(anExpression) And Not anExpression = "" End Function ' SQLPrep_n '--------------------------------------- ' Public Function SQLPrep_b(ByVal abExpression, ByRef abDefault) ' Declare Database Constants Const lbTRUE = -1 '1 = SQL, -1 = Access Const lbFALSE = 0 Dim lbResult ' Result To be passed back ' Prepare For any errors that may occur On Error Resume Next ' if expression Not provided If abExpression = "" Then ' Set expression To default value abExpression = abDefault End If ' abExpression = "" ' Attempt To convert expression lbResult = CBool(abExpression) ' if Err Occured If Err Then ' Clear the Error Err.Clear ' Determine action based on Expression Select Case LCase(abExpression) ' True expressions Case "yes", "on", "true", "-1", "1" lbResult = True ' False expressions Case "no", "off", "false", "0" lbResult = False ' Unknown expression Case Else lbResult = abDefault End Select ' LCase(abExpression) End If ' Err ' if result is True If lbResult Then ' Return True SQLPrep_b = lbTRUE ' Else Result is False Else ' Return False SQLPrep_b = lbFALSE End If ' lbResult End Function ' SQLPrep_b '--------------------------------------- ' Public Function SQLPrep_d(ByRef adExpression) ' if Expression valid Date If IsDate(adExpression) Then ' Return Date 'SQLPrep_d = "'" & adExpression & "'" ' SQL Database SQLPrep_d = "#" & adExpression & "#" ' Access Database ' Else Expression Not valid Date Else ' Return NULL SQLPrep_d = "NULL" End If ' IsDate(adExpression) End Function ' SQLPrep_d '--------------------------------------- ' Public Function SQLPrep_c(ByVal acExpression) ' if Empty Expression If acExpression = "" Then ' Return Null SQLPrep_c = "NULL" ' Else expression has content Else ' Prepare For Errors On Error Resume Next ' Attempt To convert expression to Currency SQLPRep_c = CCur(acExpression) ' if Error occured If Err Then ' Clear Error Err.Clear SQLPrep_c = "NULL" End If ' Err End If ' acExpression = "" End Function ' SQLPrep_c '--------------------------------------- ' Function buildJoinStatment(sTable,sFldLstAry,rs,conn) Dim i,sSql,sTablesAry,sJnFldsAry,bJoinAry,sJoinDisplay ReDim sTablesAry(UBound(sFldLstAry)) ReDim sJnFldsAry(UBound(sFldLstAry)) ReDim bJoinAry(UBound(sFldLstAry)) For i = 0 To UBound(sFldLstAry) sSql = "SELECT OBJECT_NAME(rkeyid),COL_NAME(rkeyid,rkey1)" sSql = sSql &" FROM sysreferences" sSql = sSql &" WHERE fkeyid = OBJECT_ID('"& sTable &"') " sSql = sSql &" AND col_name(fkeyid,fkey1) = '"& Trim(sFldLstAry(i)) &"'" rs.open sSql,conn If Not rs.eof Then sTablesAry(i) = rs(0) sJnFldsAry(i) = rs(1) End If rs.close Next If UBound(sFldLstAry) >= 0 Then For i = 0 To UBound(sFldLstAry) If sTablesAry(i) <> "" Then bJoinAry(i) = True Else bJoinAry(i) = False End If If i <> UBound(sFldLstAry) Then sSql = sSql &" +' - '+ " Next sSql = "FROM "& sTable For i = 0 To UBound(sFldLstAry) If bJoinAry(i) Then sSql = sSql &" LEFT JOIN "& sTablesAry(i) &" ON "& sTable &"."& sFldLstAry(i) &" = "& sTablesAry(i) &"."& sJnFldsAry(i) Next End If buildJoinStatment = sSql End Function '--------------------------------------- ' ---------------------------------------- ' Function buildQuery(ByRef asFieldAry, ByVal asKeyWords) ' To find fields that may have a word in them ' OR roger ' \| roger ' roger ' To find fields that must match a word ' AND roger ' + roger ' & roger ' To find fields that must Not match a word ' Not roger ' - roger ' Also use phrases ' +"rogers dog" -cat ' +(rogers dog) Dim loRegExp Dim loRequiredWords Dim loUnwantedWords Dim loOptionalWords Dim lsSQL Dim lnIndex Dim lsKeyword Set loRegExp = New RegExp loRegExp.Global = True loRegExp.IgnoreCase = True loRegExp.Pattern = "((AND\|[+&])s[([{""].[)]}""])\|((ANDs\|[+&])s[-w']+)" Set loRequiredWords = loRegExp.Execute(asKeywords) asKeywords = loRegExp.Replace(asKeywords, "") loRegExp.Pattern = "(((NOT\|[-])s)?[([{""].[)]}""])\|(((NOTs+\|[-])s)[-w']+)" Set loUnwantedWords = loRegExp.Execute(asKeywords) asKeywords = loRegExp.Replace(asKeywords, "") loRegExp.Pattern = "(((OR\|[\|])s)?[([{""].[)]}""])\|(((ORs+\|[\|])s)?[-w']+)" Set loOptionalWords = loRegExp.Execute(asKeywords) asKeywords = loRegExp.Replace(asKeywords, "") If Not loRequiredWords.Count = 0 Then ' REQUIRED lsSQL = lsSQL & "(" For lnIndex = 0 To loRequiredWords.Count - 1 lsKeyword = loRequiredWords.Item(lnIndex).Value loRegExp.Pattern = "^(AND\|[+&])s" lsKeyword = loRegExp.Replace(lsKeyword, "") loRegExp.Pattern = "[()""[]{}]" lsKeyword = loRegExp.Replace(lsKeyword, "") lsKeyword = Replace(lsKeyword, "'", "''") If Not lnIndex = 0 Then lsSQL = lsSQL & " AND " End If lsSQL = lsSQL & "(" & Join(asFieldAry, " LIKE '%" & lsKeyword & "%' OR ") & " LIKE '%" & lsKeyword & "%')" Next lsSQL = lsSQL & ")" End If If Not loOptionalWords.Count = 0 Then ' OPTIONAL If lsSQL = "" Then lsSQL = lsSQL & "(" Else lsSQL = lsSQL & " AND (" End If For lnIndex = 0 To loOptionalWords.Count - 1 lsKeyword = loOptionalWords.Item(lnIndex).Value loRegExp.Pattern = "^(OR\|[\|])s" lsKeyword = loRegExp.Replace(lsKeyword, "") loRegExp.Pattern = "[()""[]{}]" lsKeyword = loRegExp.Replace(lsKeyword, "") lsKeyword = Replace(lsKeyword, "'", "''") If Not lnIndex = 0 Then lsSQL = lsSQL & " OR " End If lsSQL = lsSQL & "(" & Join(asFieldAry, " LIKE '%" & lsKeyword & "%' OR ") & " LIKE '%" & lsKeyword & "%')" Next lsSQL = lsSQL & ")" End If If Not loUnwantedWords.Count = 0 Then ' UNWANTED If lsSQL = "" Then lsSQL = lsSQL & "NOT (" Else lsSQL = lsSQL & " AND Not (" End If For lnIndex = 0 To loUnwantedWords.Count - 1 lsKeyword = loUnWantedWords.Item(lnIndex).Value loRegExp.Pattern = "^(NOT\|[-])s*" lsKeyword = loRegExp.Replace(lsKeyword, "") loRegExp.Pattern = "[()""[]{}]" lsKeyword = loRegExp.Replace(lsKeyword, "") lsKeyword = Replace(lsKeyword, "'", "''") If Not lnIndex = 0 Then lsSQL = lsSQL & " OR " End If lsSQL = lsSQL & "(" & Join(asFieldAry, " LIKE '%" & lsKeyword & "%' OR ") & " LIKE '%" & lsKeyword & "%')" Next lsSQL = lsSQL & ")" End If If Not lsSQL = "" Then lsSQL = "(" & lsSQL & ")" buildQuery = lsSQL End Function

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