JDBC Developer's Guide - Supra - Cincom

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setConnectPoolTimeout(long milliseconds)The setConnectPoolTimeout(long milliseconds) static method of ordbDriver isused to enable, and disable pooling, or to alter the timeout duration forconnections. If zero is passed, all existing connections in the available poolwill be disconnected from the database, and connection pooling will bedisabled. If a non-zero value is specified, then connection pooling will beenabled. The parameter specifies the number of milliseconds that a databaseconnection should remain in the available connection pool before beingdisconnected from the database.long getConnectPoolTimeout()The getConnectPoolTimeout() will return zero if connection pooling is disabled(the default). The connection timeout value in milliseconds will be returned ifconnection pooling is enabled.By default, connection pooling is disabled.If you make use of connection pooling, you should make sure to issue anordbDriver.setConnectPoolTimeout(0) statement when your application exists.Failure to do this will result in spurious (but harmless) errors reported by thedatabase server occurring because of the open connections being terminatedwhen the client process (your application) shuts down.The file poolingSample.java in the %ORDB%\demo\jdbc\samples directorycontains an example that uses connection pooling.Trapping exceptionsJDBC handles most errors that occur in the program as exceptions. Javaprovides the try...catch statement to catch the exception and theprintStackTrace() method to print the stack trace.The following code fragment illustrates how you can catch SQL exceptions andprint the stack trace:try { }catch(SQLException e){ e.printStackTrace (); }JDBC Developer's Guide, P25-9504-03 Page 90Chapter: 6. Coding tips and troubleshootingSection: Performance optimization
Schema locksThe default behavior of the Cincom ORDB Client API is to maintain schema readlocks across transaction boundaries (controlled by the KEEP_SCHEMA_LOCKSparameter). This can cause unwanted concurrency problems. You can controlwhether or not schema locks are attempted to be held across transactionboundaries by making use of two methods of the ordbConnection class:♦♦commit(boolean releaseSchemaLocks)rollback(boolean releaseSchemaLocks)For more information on the ordbConnection class methods, refer to thejavadoc located in your %ORDB%\docs\jdbc\ordbjava directory.JDBC Developer's Guide, P25-9504-03 Page 91Chapter: 6. Coding tips and troubleshootingSection: Performance optimization
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SQL ACCESS FOR SUPRASERVER PDM ®JD
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Contents1. Overview ...............
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6. Coding tips and troubleshooting
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What is JDBC?JDBC (Java Database Co
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Cincom ORDB extensions to the JDBC
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Checking installed directories and
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Testing JDBC and the database conne
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System.out.println ("Please enter i
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3. Basic FeaturesIntroductionThis c
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Step 2: Open a connection to a data
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Step 5: Process the ResultSet objec
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Cincom ORDB JDBC extension typesAlt
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4. Cincom ORDB ExtensionsIntroducti
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Class ordbGloThe ordbjava.jdbc.ordb
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prepare a statement that has an inp
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get the first resort referenceordbj
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Invoking database methodsYou can us
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Creating custom Java classes for Ci
Page 40 and 41: Annotated examples of custom mapped
Page 42 and 43: The above constructor can be used b
Page 44 and 45: class jaccommodations.javaThe follo
Page 46 and 47: public void readSQL(SQLInput stream
Page 48 and 49: Relating Java classes to database c
Page 50 and 51: Controlling when custom mapping occ
Page 52 and 53: Using the getAttributes method of t
Page 54 and 55: 13 activities// 14 sounds_of_the_ca
Page 56 and 57: }Statement stmt = conn.createStatem
Page 58 and 59: In the previous example, the applic
Page 60 and 61: ♦writeSQL() method. You must impl
Page 62 and 63: Retrieving a collection and its ele
Page 64 and 65: while (rset.next()) {// activities
Page 66 and 67: ordbCollection rooms = null;while (
Page 68 and 69: public static void main (String arg
Page 70 and 71: insertValue(Object javaObj, int JDB
Page 72 and 73: Example using the Array as input pa
Page 74 and 75: create a new collection of seashore
Page 76 and 77: 5. Cincom ORDB JDBC NotesIntroducti
Page 78 and 79: ConnectionThe database does not sup
Page 80 and 81: PreparedStatementCincom ORDB JDBC D
Page 82 and 83: Cincom ORDB JDBC Driver does not su
Page 84 and 85: SQLOutputThe Cincom ORDB JDBC Drive
Page 86 and 87: JDBC and multi-threadingThe Cincom
Page 88 and 89: Example: Disabling AutoCommit. The
Page 92 and 93: Logging JDBC callsThe Cincom ORDB J
Page 94 and 95: Accessing JDBC samplesUse one of th
Page 96 and 97: IndexAaccesing attribute values,exa
Page 98: RResultSet objectclosing 23processi
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