oracle.toplink.essentials.tools.schemaframework.TableSequenceDefinition Maven / Gradle / Ivy
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package oracle.toplink.essentials.tools.schemaframework;
import java.util.Vector;
import java.io.*;
import java.math.BigDecimal;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.sequencing.Sequence;
import oracle.toplink.essentials.sequencing.DefaultSequence;
import oracle.toplink.essentials.sequencing.TableSequence;
/**
*
* Purpose: Allow a generic way of creating sequences on the different platforms,
* and allow optional parameters to be specified.
*
*/
public class TableSequenceDefinition extends SequenceDefinition {
/**
* INTERNAL:
* Should be a sequence defining table sequence in the db:
* either TableSequence
* DefaultSequence (only if case platform.getDefaultSequence() is a TableSequence).
*/
public TableSequenceDefinition(Sequence sequence) {
super(sequence);
}
/**
* INTERNAL:
* Return the SQL required to insert the sequence row into the sequence table.
* Assume that the sequence table exists.
*/
public Writer buildCreationWriter(AbstractSession session, Writer writer) throws ValidationException {
try {
writer.write("INSERT INTO ");
writer.write(getSequenceTableName());
writer.write("(" + getSequenceNameFieldName());
writer.write(", " + getSequenceCounterFieldName());
writer.write(") values (");
writer.write("'" + getName() + "', " + Integer.toString(sequence.getInitialValue() - 1) + ")");
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
return writer;
}
/**
* INTERNAL:
* Return the SQL to delete the row from the sequence table.
*/
public Writer buildDeletionWriter(AbstractSession session, Writer writer) throws ValidationException {
try {
writer.write("DELETE FROM ");
writer.write(getSequenceTableName());
writer.write(" WHERE " + getSequenceNameFieldName());
writer.write(" = '" + getName() + "'");
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
return writer;
}
/**
* INTERAL:
* Execute the SQL required to insert the sequence row into the sequence table.
* Assume that the sequence table exists.
*/
public boolean checkIfExist(AbstractSession session) throws DatabaseException {
Vector results = session.executeSelectingCall(new oracle.toplink.essentials.queryframework.SQLCall("SELECT * FROM " + getSequenceTableName() + " WHERE " + getSequenceNameFieldName() + " = '" + getName() + "'"));
return !results.isEmpty();
}
/**
* PUBLIC:
*/
public String getSequenceTableName() {
return getTableSequence().getTableName();
}
/**
* PUBLIC:
*/
public String getSequenceCounterFieldName() {
return getTableSequence().getCounterFieldName();
}
/**
* PUBLIC:
*/
public String getSequenceNameFieldName() {
return getTableSequence().getNameFieldName();
}
/**
* INTERNAL:
* Return a TableDefinition specifying sequence table.
*/
public TableDefinition buildTableDefinition() {
TableDefinition definition = new TableDefinition();
definition.setName(getSequenceTableName());
definition.addPrimaryKeyField(getSequenceNameFieldName(), String.class, 50);
definition.addField(getSequenceCounterFieldName(), BigDecimal.class);
return definition;
}
protected TableSequence getTableSequence() {
if(sequence instanceof TableSequence) {
return (TableSequence)sequence;
} else {
return (TableSequence)((DefaultSequence)sequence).getDefaultSequence();
}
}
}