Hi,
I've rewritten the database connector of HSQL to support some features
of HSQL verion 1.8. It adds support for identity columns an foreign
keys. Unique columns are still a problem when not using UniqueConstraints.
Best regards
Oliver Kykal
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package oracle.toplink.essentials.platform.database;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.*;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.internal.databaseaccess.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.queryframework.ValueReadQuery;
/**
* <p><b>Purpose</b>: Provides HSQL specific behaviour.
*
* @since TOPLink/Java 4.5
*/
public class HSQLPlatform extends DatabasePlatform {
protected Hashtable buildFieldTypes() {
Hashtable fieldTypeMapping;
fieldTypeMapping = super.buildFieldTypes();
fieldTypeMapping.put(Boolean.class, new FieldTypeDefinition("TINYINT", false));
fieldTypeMapping.put(Integer.class, new FieldTypeDefinition("INTEGER", false));
fieldTypeMapping.put(Long.class, new FieldTypeDefinition("NUMERIC", 19));
fieldTypeMapping.put(Float.class, new FieldTypeDefinition("REAL", false));
fieldTypeMapping.put(Double.class, new FieldTypeDefinition("REAL", false));
fieldTypeMapping.put(Short.class, new FieldTypeDefinition("SMALLINT", false));
fieldTypeMapping.put(Byte.class, new FieldTypeDefinition("SMALLINT", false));
fieldTypeMapping.put(java.math.BigInteger.class, new FieldTypeDefinition("NUMERIC", 38));
fieldTypeMapping.put(java.math.BigDecimal.class, new FieldTypeDefinition("NUMERIC", 38).setLimits(38, -19, 19));
fieldTypeMapping.put(Number.class, new FieldTypeDefinition("NUMERIC", 38).setLimits(38, -19, 19));
fieldTypeMapping.put(Byte[].class, new FieldTypeDefinition("BINARY", false));
fieldTypeMapping.put(Character[].class, new FieldTypeDefinition("LONGVARCHAR", false));
fieldTypeMapping.put(byte[].class, new FieldTypeDefinition("BINARY", false));
fieldTypeMapping.put(char[].class, new FieldTypeDefinition("LONGVARCHAR", false));
fieldTypeMapping.put(java.sql.Blob.class, new FieldTypeDefinition("BINARY", false));
fieldTypeMapping.put(java.sql.Clob.class, new FieldTypeDefinition("LONGVARCHAR", false));
return fieldTypeMapping;
}
public boolean isHSQL() {
return true;
}
@Override
public boolean supportsNativeSequenceNumbers() {
return true;
}
@Override
public boolean shouldNativeSequenceAcquireValueAfterInsert() {
return true;
}
public ValueReadQuery buildSelectQueryForNativeSequence() {
ValueReadQuery selectQuery = new ValueReadQuery();
StringWriter writer = new StringWriter();
writer.write("CALL IDENTITY()");
selectQuery.setSQLString(writer.toString());
return selectQuery;
}
@Override
public void printFieldUnique(Writer writer, boolean isUnique, AbstractSession session, String qualifiedFieldName) throws IOException {
//TODO 'unique' attribute for clomns has to be added. Use UniqueConstrains instead
}
/**
* INTERNAL:
* Append the receiver's field 'identity' constraint clause to a writer.
*/
public void printFieldIdentityClause(Writer writer) throws ValidationException {
try {
writer.write(" IDENTITY");
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
}
/**
* INTERNAL:
* HSQL 1.8 does the ALTER TABLE method of create foreign key constraints
*/
public boolean supportsForeignKeyConstraints() {
return true;
}
}