Tun SQL â Data Access - Esker

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To compensate for the disadvantages of Embedded SQL, Microsoftconceived a new approach based on the ODBC mechanism (OpenDatabase Connectivity). ODBC is a further development of WOSA(Windows Open System Architecture).Application 1 Application 2 Application 3ODBC.LIB ODBC.LIB ODBC.LIBODBC.DLLDRIVER1.DLL DRIVER2.DLL DRIVER3.DLLDBMS 1 DBMS 2 DBMS 3ODBC is a well-defined set of C functions that makes it possible toretrieve data from, or update data in, a DBMS. These functions havebeen assembled in a DLL (Dynamic Link Library) that can be used byany Windows application. The functions of the ODBC DLL(ODBC.DLL) analyze SQL requests. They then pass them to ODBCdrivers whose job it is to convert the calls to suit the particular API ofthe DBMS you're using. An ODBC driver lets you view the DBMSinterface. You can then enable your application to use it just like anyother ODBC-compliant DBMS.Microsoft supplies the ODBC.DLL library and all the tools required touse it. They don't, however, supply ODBC drivers for all the DBMSson the market. Microsoft is happy supplying drivers for its proprietarystorage systems (Excel, Word, Access...).ODBC drivers for specific databases are supplied directly by the DBMSpublisher or by third parties who specialize in this domain (Esker).1 - 10 Data Access !
Finally, ODBC provides maximum interoperability. A simple Windowsapplication can access different management systems even if it wasn'tspecifically designed to do so. ODBC lets developers program, compileand deliver programs without having to worry about the DBMS theprogram will be used with. The users only have to provide the rightdriver so the application on which they're working cooperates with theirDBMS.ODBC is a valuable mechanism for multi-domain applications such asspreadsheets, word processing applications, and development tools thatmanipulate information from DBMSs without knowing a priori whichDBMS is being used.The Client/Server modelFor some years, the term Client/Server has been on the lips of everyonein the computing industry. In its widest sense, the Client/Server modelis a computing model in which at least two units cooperate to supply aparticular service.The "Gartner Group" has identified six principal types of Client/Servermode applications which they've classified according to the number offunctions performed by the client or the server.1 2 3 4 5 6DataManagementDataProcessingPresentationDataManagementDataProcessingDataManagementDataManagementDataProcessingDataManagementDataManagementDataProcessingSERVERPresentationPresentationDataProcessingPresentationREVAMPING X WINDOW NFSDataProcessingPresentationDataManagementDataProcessingPresentationDataManagementDataProcessingPresentationDISTRIBUTEDDATABASECLIENT! Introduction to Tun SQL 1 - 11
Page 1 and 2: Tun SQL - Data Access
Page 3 and 4: PREFACETun SQL - Data Access is an
Page 5 and 6: TABLE OF CONTENTSPART 1 PRESENTATIO
Page 7: PART 1PRESENTATION AND USE
Page 12 and 13: The applications that make the leas
Page 14 and 15: UNIX ServerPC Client under WindowsD
Page 16 and 17: In addition to the security offered
Page 18 and 19: You use this utility to query a hos
Page 20: Using a proxy server firewallWhen y
Page 23 and 24: Configuring the data sourceClick th
Page 25 and 26: " Driver tabClick the Driver tab to
Page 27 and 28: Click the Row Limits tab to display
Page 29 and 30: Notes:In this chapter you were aske
Page 31 and 32: " ExecutionTo execute the SQL batch
Page 34 and 35: Run the program by clicking the Tun
Page 37 and 38: 3C-ISAMIntroduction to C-ISAM" The
Page 39 and 40: " Installing the C-ISAM driverTo in
Page 41 and 42: To do that, choose Database#Connect
Page 43 and 44: For example, the statement that cre
Page 45 and 46: " Viewing a table's C structureYou
Page 47 and 48: You defined the table using the sta
Page 49: PART 2DATABASE REVAMPING
Page 52 and 53: The consequences of this are:• Im
Page 54 and 55: Each environment can be viewed as a
Page 57 and 58: 5TUN DB REVAMP GENERAL USEGeneral o
Page 59 and 60: Importing data source environmentsT
Page 61 and 62:
If you want the virtual table to co
Page 63 and 64:
Example 1:You have access to a real
Page 65 and 66:
To assign a filter to a virtual fie
Page 67 and 68:
• Click the Ins button to add the
Page 69 and 70:
A pane opens below the real or virt
Page 71 and 72:
On a request for environment valida
Page 73 and 74:
Creating a virtual data sourceThe c
Page 75 and 76:
" Reloading the database structureW
Page 77:
PART 3APPENDICES
Page 80 and 81:
CONFIG.XXXContains the working and
Page 82 and 83:
DbmsName=DatabaseNameSets or change
Page 84 and 85:
DBMAP" SyntaxWindows application fo
Page 86 and 87:
DBSHOW" SyntaxWindows application f
Page 88 and 89:
The columns required to view the di
Page 90 and 91:
-c=config_fileAssociates a configur
Page 92 and 93:
" Informix options-hBy default, Inf
Page 95 and 96:
BSQL STATEMENTS USED IN C-ISAMPrinc
Page 97 and 98:
CREATE DATABASE" Purpose" SyntaxCre
Page 99 and 100:
DEFINE TABLE" Purpose" SyntaxDefine
Page 101 and 102:
DEFAULT CLAUSE" Syntax" UseUsed in
Page 103 and 104:
CONSTRAINT DEFINITION SUBSET" Purpo
Page 105 and 106:
FILE IS OPTION" Purpose" Syntax" Us
Page 107 and 108:
CREATE SYNONYM" Purpose" SyntaxAttr
Page 109 and 110:
DROP DATABASE" Purpose" SyntaxRemov
Page 111 and 112:
DISCONNECT DATABASE" Purpose" Synta
Page 113 and 114:
DROP TABLE" Purpose" Syntax" UseDel
Page 115 and 116:
UNDEFINE TABLE" Purpose" SyntaxDele
Page 117 and 118:
SELECT CLAUSE" Syntax" UseUsed by t
Page 119 and 120:
FROM CLAUSE" Purpose" SyntaxUsed by
Page 121 and 122:
GROUP BY CLAUSE" Purpose" Syntax" U
Page 123 and 124:
ORDER BY CLAUSE" Purpose" Syntax" U
Page 125 and 126:
INSERT" Purpose" SyntaxInserts one
Page 127 and 128:
UPDATE" Purpose" SyntaxChanges the
Page 129 and 130:
AGGREGATE EXPRESSION" SyntaxUsed by
Page 131 and 132:
If the bit data type is used with D
Page 133 and 134:
When this type of data is used with
Page 135 and 136:
" The double typeThis type correspo
Page 137 and 138:
INDEXAllowed,82Arrayfields (Progres
Page 139:
Tables (C-ISAM),41time,130, 135time
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