OpenEdge Data Management: DataServer for Microsoft SQL Server

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Chapter 6: Connecting the DataServer Table 35 lists the DSLOG-MANAGER system handle attributes. Table 35: DSLOG-MANAGER system handle attributes Attribute Access Function DB-CONTEXT 1 Readable/ Writable Specifies the logical database name of a valid and connected data source for a supported db-type. It set the system handle to a specific server context to enable access to other DSLOG-MANAGE attributes and methods. You can also set it to the alias of a connected data source. ENTRY-TYPES-LIST Readable Returns a list of all valid entry types. LOG-ENTRY-TYPES Readable/ Writable Returns/Writes a list of one or more types of log entries. The default value returned by the LOG-ENTRY-TYPES attribute are the logentrytypes specified in the -Dsrv parameter when the foreign data source was connected. LOGFILE-NAME 2 Readable Returns the name of the log file. By default, the DSLOG-MANAGER uses the dataserv.lg log file. You can change the file name by using the -dslog startup parameter from the OpenEdge client or the srvrDSLogFile UBROKER property from the DataServer broker instance. The server context cannot work without a log file opened so it cannot be changed at runtime. This would risk having no log file opened in the event that the new log file name failed to open. LOGGING-LEVEL Readable/ Writable Returns/Writes the level at which log entries are written. The default value returned by the LOGGING-LEVEL attribute is the logginglevel specified in the -Dsrv parameter when the foreign data source was connected. LOG-THRESHOLD 3 Readable Returns the file size threshold of log files. When the current log file becomes equal to or greater than the specified size, OpenEdge renames and saves the log file and creates a new log file. NUM-LOG-FILES 4 Readable Returns the number of rolled over log files to keep on disk at any one time, for OpenEdge session, including the current log file. HANDLE Readable Returns a handle. INSTANTIATING- PROCEDURE Readable Returns a procedure handle for the first, or instantiating, procedure. TYPE Readable Returns the type of handle. 232 OpenEdge Data Management: DataServer for Microsoft SQL Server
Connecting a schema holder 1. Each connection to a DataServer is its own entity. The DB-CONTEXT attribute enables you to provide different logging settings for each data source connection. The DB-CONTEXT attribute must be set to the logical database name or alias which is currently connected, prior to setting any other attributes. The attribute defaults to the unknown value. If DB-CONTEXT does not contain the value of a valid logical database name, any attempt to access other attributes of DSLOG-MANAGER fails. 2. The value returned by the LOGFILE-NAME is the default name dataserv.lg or; the name specified by the -dslog client startup parameter for self-service clients; the name specified by the -dslog startup parameter when ProBroker is started; the name specified by the srvrDSLogFile attribute in the ubroker.properties file when a Unified Broker instance is started for DataServer connections. 3. The value returned by the LOG-THRESHOLD is one of the following:the name specified by the -logthreshold client startup parameter for self-service clients; the name specified by the -logthreshold startup parameter when ProBroker is started; the name specified by the srvrLogThreshold attribute in the ubroker.properties file when a Unified Broker instance is started for DataServer connections. 4. The value returned by the NUM-LOG-FILES is one of the following: the name specified by the -numlogfiles client startup parameter for self-service clients; the name specified by the -numlogfiles startup parameter when ProBroker is started; the name specified by the srvrNumLogFiles attribute in the ubroker.properties file when a Unified Broker instance is started for DataServer connections. By default, the DSLOG-MANAGER uses the dataserv.lg log file. You can change the file name by using the -dslog startup parameter from the OpenEdge client or the srvrDSLogFile UBROKER property from the DataServer broker instance. The following example tests for an active connection before setting the DSLOG-MANAGER to that connected DataServer context and getting a list of log entry types and setting a specific message inside the application at runtime. IF CONNECTED(“mymss”) THEN DO: DSLOG-MANAGER:DB-CONTEXT = ‘mymss’. MESSAGE DS-LOGMANAGER:LOG-ENTRY-TYPES. DSLOG-MANAGER:WRITE-MESSAGE (“Some message after connection”). END. For more information on the DSLOG-MANAGER system handle or its attributes, see the DSLOG-MANAGER system handle reference entry in OpenEdge Development: ABL Reference. Table 36 lists the function of each DSLOG-MANAGER system handle method. Table 36: DSLOG-MANAGER system handle methods Method Function CLEAR-LOG( ) Clears all messages existing in the current client log file and leaves the file open for writing WRITE-MESSAGE( ) Writes user messages to the current log file Note: The CLOSE-LOG( ) is not a supported DSLOG-MANAGER system handle method. You cannot execute the CLOSE-LOG( ) method unless there is only one brokered DataServer server spawned by the Unified Broker or by ProBroker. OpenEdge Data Management: DataServer for Microsoft SQL Server 233
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® ® PROGRESS® OPENEDGE® OpenEdg
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Contents Preface . . . . . . . . .
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Contents Data output and retrieval
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Contents Migrating an OpenEdge data
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Tables Contents Table 1: DataServer
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Examples Contents Example 1: Passin
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Preface This Preface contains the f
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Chapter 5, “Configuring the DataS
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Before you begin Preface Before att
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In this example, STREAM stream, UNL
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After displaying a message, OpenEdg
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Preface Software Foundation (http:/
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Preface use, copy, modify, and dist
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Preface DISCLAIMS ALL WARRANTIES WI
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Preface INCLUDING ALL IMPLIED WARRA
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Preface WARRANTIES OF MERCHANTABILI
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Preface conditions for packages lik
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Introduction OpenEdge Data Manageme
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DataServer components DataServer co
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DataServer for MS SQL Server logic
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Figure 3 illustrates the schema-loa
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DataServer utilities DataServer uti
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DataServer configurations DataServe
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The remote DataServer configuration
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DataServer configurations Configuri
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Software requirements Software requ
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Guidelines for using the DataServer
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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
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Client code page Database design is
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Support for Unicode Database design
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Indexes and sorting Database design
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Database design issues source’s c
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Triggers Database design issues Tri
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Data types Data types MS SQL Server
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Table 9: MS SQL Server data type eq
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Processing activities that require
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Table 11: MS SQL Server 2008 dateti
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Performing data type conversions Da
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Enabling Datetime data types using
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2008, or if you use a native driver
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Default and Special Datetime Defaul
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ABL-to-MS SQL Server data type mapp
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Unknown value (?) Data types The Da
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Record creation Suppose that you ha
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Data source record locking Data sou
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Handling lock timeouts Data source
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Locking impact on queries Data sour
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Data source record locking When thi
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To avoid this type of problem, the
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Error handling If you use NO-ERROR
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Cursors Cursors A cursor is like a
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Cursors your specifications. Adjust
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• Block cursors are directly link
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FIND customer WHERE ROWID(customer)
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For example, the following statemen
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find.p /* This code accesses an Ope
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ABL issues Table 19 summarizes ABL
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RDBMS Stored Procedure Details Open
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RDBMS stored procedure basics RDBMS
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RDBMS stored procedure basics When
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Run Stored-Procedure details •
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Run Stored-Procedure details An exp
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Run Stored-Proc statement execution
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Run Stored-Procedure details Also n
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Loading results into a temp-table T
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Retrieving return codes Interfacing
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Interfacing with RDBMS stored proce
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Loading result sets into temp-table
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Employing additional enhancements I
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Handling errors Handling errors The
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ROWID Support This section presents
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ROWID Support The RUN STORED-PROC c
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ROWID Support If the table uses com
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Additional Features to Enhance Data
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Connection pooling Connection pooli
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DataServer connection management Co
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Firehose exclusions Connection pool
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Cursor downgrades Connection poolin
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Query tuning Query tuning How you s
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LOOKAHEAD NO-LOOKAHEAD SEPARATE-CON
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Query tuning Table 24: Query-tuning
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Join by SQLDB Join by SQLDB For que
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Table 25 describes how these contro
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Modifying the run-time schema check
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Page 187 and 188: Configuring a remote DataServer 4.
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Page 191 and 192: The ubroker.properties file Configu
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Page 197 and 198: Creating a schema holder Creating a
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Page 209 and 210: Connecting the DataServer You can s
Page 211 and 212: Starting a remote DataServer Starti
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Page 217 and 218: Connection guidelines Connection gu
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Page 229 and 230: qt_separate_connection qt_no_separa
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Page 235 and 236: Table 38 lists the DataServer log e
Page 237 and 238: Logging levels You can choose one o
Page 239 and 240: Enabling ABL to SQL Correlation in
Page 241 and 242: Connecting a schema holder Example
Page 243 and 244: Connection failures and OpenEdge re
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Page 247 and 248: Using the $UNIQUE_DSLOG environment
Page 249 and 250: The DataServer Tutorial OpenEdge Da
Page 251 and 252: Demonstration databases for DataSer
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Page 259 and 260: DataServer utilities When you acces
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Page 267 and 268: Creating a schema holder You can se
Page 269 and 270: Updating a schema holder Updating a
Page 271 and 272: Verifying a schema holder Verifying
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Page 279 and 280: Managing server attributes See the
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Managing server attributes If the p
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Managing server attributes 6. The P
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Defining a default constraint defin
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Managing server attributes 5. Click
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Managing server attributes • Resu
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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 4. Chan
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Adding extended ABL support 3. Drop
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Troubleshooting This chapter descri
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ODBC options ODBC options The DataS
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ODBC options Table 56: DataServer o
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Using MS SQL Server and DataServer
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Large rows—the PRGRS_MINBUF optio
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ODBC options Wait time for asynchro
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Using the block cursor switches ODB
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Migration Issues This appendix disc
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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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OpenEdge Management or OpenEdge Exp
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Syntax Parameters service-name PROB
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Other command line utilities for th
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Data Type Details C This appendix s
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nvarchar 8 SQL_NVARCHAR CHARACTER t
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Using qt_debug to Analyze Performan
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Using qt_debug to analyze performan
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Index Numbers 4GLTrans log entry ty
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display format 309 overflow checkin
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INPUT-OUTPUT option retrieving para
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DataServer (-Dsrv) startup paramete
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221, 242, 359 Schema defined 40 loa
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OpenEdge Data Management: DataServer for Microsoft SQL Server

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