JDBC Developer's Guide - Supra - Cincom

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Step 4: Execute a query and return a ResultSet objectTo query the database, use the executeQuery() method of your Statementobject. This method takes an SQL statement as input and returns an object ofthe JDBC ResultSet class.To continue the example, once you create the Statement object stmt, thenext step is to execute a query. The following example populates aResultSet object with the contents of the name column of a database classnamed resort:ResultSet rset = stmt.executeQuery ("SELECT name FROM resort");JDBC Developer's Guide, P25-9504-03 Page 22Chapter: 3. Basic FeaturesSection: First steps in JDBC
Step 5: Process the ResultSet objectOnce you execute your query, use the next() method of your ResultSetobject to iterate through the results. This method loops through the result setrow by row, detecting the end of the result set when it is reached.To pull data out of the result set as you iterate through it, use the variousgetXXX() methods of the ResultSet object, where XXX corresponds to aJava datatype.For example, the following code will iterate through the ResultSet objectrset from the previous section, and will retrieve and print each resort name:while (rset.next())System.out.println (rset.getString(1));The next() method returns false when it reaches the end of the result set.The resort names are materialized as Java Strings.Step 6: Close the ResultSet and Statement ObjectsYou should explicitly close the ResultSet and Statement objects after youfinish using them. This applies to all ResultSet and Statement objects youcreate when using the Cincom ORDB JDBC driver. Although the driver hasfinalize methods that will perform the cleanup, applications should explicitlyclose ResultSet and Statement objects in order to release resources assoon as possible.For example, if your ResultSet object is rset and your Statement objectis stmt, close the result set and statement with these lines:rset.close()stmt.close();When you close a Statement object that a given Connection objectcreates, the connection itself remains open.Step 7: Close the ConnectionYou must close your connection to the database once you finish your work. Usethe close() method of the Connection class to do this. For example, ifyour Connection object is conn, close the connection with this statement:conn.close();JDBC Developer's Guide, P25-9504-03 Page 23Chapter: 3. Basic FeaturesSection: First steps in JDBC
Page 1: SQL ACCESS FOR SUPRASERVER PDM ®JD
Page 4 and 5: Contents1. Overview ...............
Page 6 and 7: 6. Coding tips and troubleshooting
Page 8 and 9: What is JDBC?JDBC (Java Database Co
Page 10: Cincom ORDB extensions to the JDBC
Page 13 and 14: Checking installed directories and
Page 15 and 16: Testing JDBC and the database conne
Page 17 and 18: System.out.println ("Please enter i
Page 19 and 20: 3. Basic FeaturesIntroductionThis c
Page 21: Step 2: Open a connection to a data
Page 26 and 27: Cincom ORDB JDBC extension typesAlt
Page 28 and 29: 4. Cincom ORDB ExtensionsIntroducti
Page 30 and 31: Class ordbGloThe ordbjava.jdbc.ordb
Page 32 and 33: prepare a statement that has an inp
Page 34 and 35: get the first resort referenceordbj
Page 36 and 37: Invoking database methodsYou can us
Page 38 and 39: 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
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setConnectPoolTimeout(long millisec
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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