This example demonstrates how to create a file system database store in a J2SE Java environment. The Configuration object is used to create the database. Once created, a Connection object is returned. To create tables, the schemaUpdateBegin method is invoked to start changes to the underlying schema and the schemaUpdateComplete method completes changing the schema.
package ianywhere.ultralitej.demo; import ianywhere.ultralitej.*; /** * CreateDb: sample program to demonstrate Database creation. */ public class CreateDb { /** * mainline for program. * * @param args command-line arguments * */ public static void main ( String[] args ) { try { Configuration config = DatabaseManager.createConfigurationFile( "Demo1.ulj" ); Connection conn = DatabaseManager.createDatabase( config ); conn.schemaCreateBegin(); TableSchema table_schema = conn.createTable( "Employee" ); table_schema.createColumn( "number", Domain.INTEGER ); table_schema.createColumn( "last_name", Domain.VARCHAR, 32 ); table_schema.createColumn( "first_name", Domain.VARCHAR, 32 ); table_schema.createColumn( "age", Domain.INTEGER ); table_schema.createColumn( "dept_no", Domain.INTEGER ); IndexSchema index_schema = table_schema.createPrimaryIndex( "prime_keys" ); index_schema.addColumn( "number", IndexSchema.ASCENDING ); table_schema = conn.createTable( "Department" ); table_schema.createColumn( "dept_no", Domain.INTEGER ); table_schema.createColumn( "name", Domain.VARCHAR, 50 ); index_schema = table_schema.createPrimaryIndex( "prime_keys" ); index_schema.addColumn( "dept_no", IndexSchema.ASCENDING ); ForeignKeySchema foreign_key_schema = conn.createForeignKey( "Employee", "Department", "fk_emp_to_dept" ); foreign_key_schema.addColumnReference( "dept_no", "dept_no" ); conn.schemaCreateComplete(); conn.release(); Demo.display( "CreateDb completed successfully" ); } catch( ULjException exc ) { Demo.displayException( exc ); } } } |
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