OpenEdge Data Management: DataServer for Microsoft SQL Server

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Initial Programming Considerations 2–58 The size of r-code grows significantly when you compile procedures against a MS SQL Server data source as compared to compiling against an OpenEdge database. The r-code for a DataServer application contains as text portions of SQL statements that the DataServer passes to the data source. FOR statements FOR FIRST and FOR LAST statements that cause the DataServer to sort data before returning it to the client behave differently when returning data from a MS SQL Server data source than when returning data from an OpenEdge database. The data source might not sort data like the OpenEdge database does, so the order in which records return might differ. In addition, the server-side result set is limited to a single record to improve performance. Features and language differences The DataServer supplies you with complete ABL functionality when accessing MS SQL Server data sources. Many ABL language elements (statements, functions, and so forth) and Data Dictionary features work the same whether your application accesses a data source through the DataServer or an OpenEdge database. Use the DBRESTRICTIONS function to find out which OpenEdge features your MS SQL Server data source does not support. For the DataServer for MS SQL Server, DBRESTRICTIONS can return SETUSERID and COUNT–OF. In certain circumstances, it can return additional values. For example, it can return READ–ONLY if you connect to the schema holder in read-only mode. See the “DBRESTRICTIONS function” reference entry in OpenEdge Development: ABL Reference for information on syntax. Table 2–15 summarizes ABL differences between OpenEdge databases and MS SQL Server data sources. Table 2–15: ABL differences between OpenEdge Databases and MS SQL Server data sources (1 of 2) OpenEdge feature MS SQL Server data source difference CONTAINS operator This operator relates to word indexing, which the DataServer does not support. COUNT–OF function The DataServer does not support this function. CREATE statement Records that you create after opening a cursor might be invisible to that cursor. FIND statements FOR EACH statements OPEN QUERY statement MATCHES function BEGINS function To reduce the number of records included in the results set, qualify your FIND statements and queries with a WHERE clause. The DataServer does not support using the percent (%) or underscore (_) character with the MATCHES and BEGINS functions. Do not use these functions with a pattern that is not an expression. Note: It is theoretically possible to do this with an OpenEdge database, but using this kind of criteria results in poor performance.
NO–LOCK option 1 SHARE–LOCK option EXCLUSIVE–LOCK option ABL issues Table 2–15: ABL differences between OpenEdge Databases and MS SQL Server data sources (2 of 2) OpenEdge feature MS SQL Server data source difference An OpenEdge EXCLUSIVE–LOCK is emulated in the DataServer. An OpenEdge NO-LOCK can be emulated in the MS SQL Server database when the isolation level is set to read-uncommitted. SHARE-LOCK behavior is data source and isolation- level dependent. See the “Data source record locking” section on page 2–36 for more information. NULL MS SQL Server NULL = Unknown value (?) OpenEdge empty string ("") = a one space string in MS SQL Server. Record creation A record is created at the end of a record’s scope and not when the required index information becomes available. SESSION:TIME-SOURCE handle This system handle returns the MS SQL Server’s server time information. SETUSERID function You cannot use this function to change the login name and password. 1. For more information, see the “Data source record locking” section on page 2–36. 2–59
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PROGRESS® 10 OPENEDGE® OpenEdge®
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Contents Preface . . . . . . . . .
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Contents Values of output parameter
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Contents 8. Troubleshooting. . . .
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Tables Contents Table 1-1: DataServ
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Examples Contents Example 3-1: Pass
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Preface This Preface contains the f
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Chapter 5, “Configuring the DataS
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Typographical conventions This manu
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Preface A called external procedure
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Preface Obtaining more information
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Preface Copyright © 1991 by Lucent
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Preface OpenEdge includes Sonic sof
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Preface WARRANTIES, INCLUDING, BUT
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Introduction 1 The OpenEdge® DataS
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DataServer components DataServer co
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DataServer for MS SQL Server logic
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DataServer components If you plan t
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DataServer utilities DataServer uti
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DataServer configurations DataServe
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DataServer configurations Configuri
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Typical configuration scenarios Dat
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Guidelines for using the DataServer
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Documentation resources Documentati
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Initial Programming Considerations
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Database design issues Database des
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MS SQL Server DataServer data sourc
Page 55 and 56: Database design issues For example,
Page 57 and 58: Support for Unicode Database design
Page 59 and 60: Database design issues restrictions
Page 61 and 62: Database design issues For example,
Page 63 and 64: OpenEdge sequences Database design
Page 65 and 66: Data types MS SQL Server data types
Page 67 and 68: Table 2-5: MS SQL Server data type
Page 69 and 70: Determining your application needs
Page 71 and 72: Data types The ABL DATETIME and DAT
Page 73 and 74: Data types Table 2-10 provides deta
Page 75 and 76: Schema Migration > OpenEdge DB to M
Page 77 and 78: Default and Special Datetime Defaul
Page 79 and 80: Table 2-12 depicts mapping between
Page 81 and 82: Record creation Record creation Rec
Page 83 and 84: Record creation The VALIDATE or REL
Page 85 and 86: Share locks Data source record lock
Page 87 and 88: Additional record locking details D
Page 89 and 90: Data source record locking to be lo
Page 91 and 92: Transactions Transactions With Data
Page 93 and 94: Error handling Error handling One c
Page 95 and 96: Overflow checking Error handling Ov
Page 97 and 98: Impact of MAX-ROWS Cursors The MAX-
Page 99 and 100: Block cursors on versus off Cursors
Page 101 and 102: ABL issues • If you force the cre
Page 103 and 104: ABL issues Include the SCROLLING op
Page 105: ABL issues When you run find.p with
Page 109 and 110: RDBMS Stored Procedure Details 3 Th
Page 111 and 112: RDBMS stored procedure basics RDBMS
Page 113 and 114: RDBMS stored procedure basics schem
Page 115 and 116: Run Stored-Procedure details •
Page 117 and 118: Run Stored-Procedure details An exp
Page 119 and 120: Run Stored-Proc statement execution
Page 121 and 122: Data output and retrieval options D
Page 123 and 124: Interfacing with RDBMS stored proce
Page 125 and 126: Technique to use proc-text-buffer I
Page 129 and 130: Loading result sets into temp-table
Page 133 and 134: Details about a dynamic temp-table
Page 139 and 140: Handling errors • If you try to e
Page 141 and 142: ROWID Support It is important to no
Page 143 and 144: ROWID Support If the table uses com
Page 145 and 146: DEFINE VARIABLE hSendSQL AS HANDLE
Page 147 and 148: Additional Features to Enhance Data
Page 149 and 150: Enhancements overview For installat
Page 151 and 152: Firehose and Fast Forward-Only Curs
Page 153 and 154: • Lowest connection value • Num
Page 155 and 156: Query tuning Query tuning How you s
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LOOKAHEAD NO-LOOKAHEAD SEPARATE-CON
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Caching records Caching records The
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Join by SQLDB FOR EACH customer, EA
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Modifying the run-time schema check
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Configuring the DataServer 5 Config
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DataServer components Table 5-1: In
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Configuring a local DataServer Conf
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Configuring a remote DataServer 5.
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Configuring a remote DataServer For
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Configuring a remote DataServer Whe
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Configuring a remote DataServer The
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Creating a schema holder Creating a
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Creating a schema holder 4. Start t
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Creating a schema holder Table 5-4
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Creating a schema holder You can al
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Typical configuration for a remote
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Typical configuration for a remote
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Connecting the DataServer You can s
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Starting a remote DataServer Starti
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Starting a remote DataServer Starti
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Starting a remote DataServer For ex
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Connecting a schema holder Connecti
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Direct Connect (-DirectConnect) Pas
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Note the following command syntax u
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Use the PRGRS_CONNECT parameter in
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Connecting a schema holder Table 6-
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Connecting a schema holder 3. The v
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Connecting a schema holder Note: Ap
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Connecting a schema holder The ABL
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Connection troubleshooting Connecti
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Setting the log file location Conne
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The DataServer Tutorial 7 This chap
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Preparing to create demonstration d
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Preparing to create demonstration d
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DataServer utilities When you acces
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Creating a schema holder 4. In the
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Updating a schema holder Updating a
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Verifying a schema holder Verifying
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Verifying a schema holder 4. There
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Changing connection information in
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Deleting a schema holder Deleting a
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Migrating an OpenEdge database to M
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Delta df to MS SQL Server Increment
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Modifying field-level information Y
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Defining the ROWID Modifying a sche
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Adding extended ABL support Adding
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Adding extended ABL support Using c
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Adding extended ABL support create
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Troubleshooting This chapter descri
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ODBC options Tuning your environmen
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Tuning your environment with the -D
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SVUB,x—the Unified Broker Server
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Adjusting values Tuning your enviro
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Migration Issues A This appendix di
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Modifying your application Note the
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Sample code for the db.owner.Custom
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Server Related Command Line Utiliti
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-validate -help Progress Explorer c
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-host host-name Progress Explorer c
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Progress Explorer command line util
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-user user-name Progress Explorer c
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Syntax Parameters service-name PROB
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Non-Progress Explorer command line
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Data Type Details C This appendix s
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ntext 9 nvarchar(max) SQL_NLONGVARC
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Using qt_debug to Analyze Performan
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Index Numbers 4GLTrans log entry ty
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Data types 2-17, C-1 changing 7-34
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K Key buffer troubleshooting 8-8 Ke
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Progress Explorer Framework 5-23 an
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Service Name (-S) shutdown paramete
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OpenEdge Data Management: DataServer for Microsoft SQL Server

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