oracle.toplink.essentials.platform.database.DerbyPlatform Maven / Gradle / Ivy
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package oracle.toplink.essentials.platform.database;
import oracle.toplink.essentials.internal.databaseaccess.FieldTypeDefinition;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.internal.helper.DatabaseTable;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.queryframework.ValueReadQuery;
import java.util.Vector;
import java.io.Writer;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Hashtable;
import java.util.Collection;
import java.util.Iterator;
import oracle.toplink.essentials.internal.helper.DatabaseField;
/**
* Purpose: Provides Derby DBMS specific behaviour.
*
* @since TOPLink Essentials 1.0
*/
public class DerbyPlatform extends DB2Platform {
/**
* INTERNAL:
* TODO: Need to find out how can byte arrays be inlined in Derby
*/
protected void appendByteArray(byte[] bytes, Writer writer) throws IOException {
super.appendByteArray(bytes, writer);
}
/**
* INTERNAL:
* This method returns the query to select the timestamp from the server
* for Derby.
*/
public ValueReadQuery getTimestampQuery() {
if (timestampQuery == null) {
timestampQuery = new ValueReadQuery();
timestampQuery.setSQLString("VALUES CURRENT_TIMESTAMP");
}
return timestampQuery;
}
//TODO: check with reviewer. This method should be made private in DB2platform
public Vector getNativeTableInfo(String table, String creator, AbstractSession session) {
throw new RuntimeException("Should never reach here");
}
/**
* Used for stored procedure defs.
*/
public String getProcedureEndString() {
return getBatchEndString();
}
/**
* Used for stored procedure defs.
*/
public String getProcedureBeginString() {
return getBatchBeginString();
}
/**
* This method is used to print the output parameter token when stored
* procedures are called
*/
public String getInOutputProcedureToken() {
return "INOUT";
}
/**
* This is required in the construction of the stored procedures with
* output parameters
*/
public boolean shouldPrintOutputTokenAtStart() {
//TODO: Check with the reviewer where this is used
return false;
}
/**
* INTERNAL:
* Answers whether platform is Derby
*/
public boolean isDerby() {
return true;
}
public boolean isDB2() {
//This class inhertits from DB2. But it is not DB2
return false;
}
/**
* Allow for the platform to ignore exceptions.
*/
public boolean shouldIgnoreException(SQLException exception) {
// Nothing is ignored.
return false;
}
/**
* INTERNAL:
*/
protected String getCreateTempTableSqlSuffix() {
return " ON COMMIT DELETE ROWS NOT LOGGED";
}
/**
* INTERNAL:
* Build the identity query for native sequencing.
*/
public ValueReadQuery buildSelectQueryForIdentity() {
ValueReadQuery selectQuery = new ValueReadQuery();
selectQuery.setSQLString("values IDENTITY_VAL_LOCAL()");
return selectQuery;
}
/**
* INTERNAL:
* Indicates whether temporary table can specify primary keys (some platforms don't allow that).
* Used by writeCreateTempTableSql method.
*/
protected boolean shouldTempTableSpecifyPrimaryKeys() {
return false;
}
/**
* INTERNAL:
*/
protected String getCreateTempTableSqlBodyForTable(DatabaseTable table) {
// returning null includes fields of the table in body
// see javadoc of DatabasePlatform#getCreateTempTableSqlBodyForTable(DataBaseTable)
// for details
return null;
}
/**
* INTERNAL:
* May need to override this method if the platform supports temporary tables
* and the generated sql doesn't work.
* Write an sql string for updating the original table from the temporary table.
* Precondition: supportsTempTables() == true.
* Precondition: pkFields and assignFields don't intersect.
* @parameter Writer writer for writing the sql
* @parameter DatabaseTable table is original table for which temp table is created.
* @parameter Collection pkFields - primary key fields for the original table.
* @parameter Collection assignedFields - fields to be assigned a new value.
*/
public void writeUpdateOriginalFromTempTableSql(Writer writer, DatabaseTable table,
Collection pkFields,
Collection assignedFields) throws IOException
{
writer.write("UPDATE ");
String tableName = table.getQualifiedName();
writer.write(tableName);
writer.write(" SET ");
String tempTableName = getTempTableForTable(table).getQualifiedName();
boolean isFirst = true;
Iterator itFields = assignedFields.iterator();
while(itFields.hasNext()) {
if(isFirst) {
isFirst = false;
} else {
writer.write(", ");
}
DatabaseField field = (DatabaseField)itFields.next();
String fieldName = field.getName();
writer.write(fieldName);
writer.write(" = (SELECT ");
writer.write(fieldName);
writer.write(" FROM ");
writer.write(tempTableName);
writeAutoJoinWhereClause(writer, null, tableName, pkFields);
writer.write(")");
}
writer.write(" WHERE EXISTS(SELECT ");
writer.write(((DatabaseField)pkFields.iterator().next()).getName());
writer.write(" FROM ");
writer.write(tempTableName);
writeAutoJoinWhereClause(writer, null, tableName, pkFields);
writer.write(")");
}
/**
* INTERNAL:
* Append the receiver's field 'identity' constraint clause to a writer.
*/
public void printFieldIdentityClause(Writer writer) throws ValidationException {
try {
writer.write(" GENERATED ALWAYS AS IDENTITY");
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
}
protected Hashtable buildFieldTypes() {
Hashtable fieldTypeMapping = new Hashtable();
fieldTypeMapping.put(Boolean.class, new FieldTypeDefinition("SMALLINT DEFAULT 0", false));
fieldTypeMapping.put(Integer.class, new FieldTypeDefinition("INTEGER", false));
fieldTypeMapping.put(Long.class, new FieldTypeDefinition("BIGINT", false));
fieldTypeMapping.put(Float.class, new FieldTypeDefinition("FLOAT"));
fieldTypeMapping.put(Double.class, new FieldTypeDefinition("FLOAT", 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("BIGINT", false));
fieldTypeMapping.put(java.math.BigDecimal.class, new FieldTypeDefinition("DECIMAL"));
fieldTypeMapping.put(Number.class, new FieldTypeDefinition("DECIMAL"));
fieldTypeMapping.put(String.class, new FieldTypeDefinition("VARCHAR", 255));
fieldTypeMapping.put(Character.class, new FieldTypeDefinition("CHAR", 1));
fieldTypeMapping.put(Byte[].class, new FieldTypeDefinition("BLOB", 64000));
fieldTypeMapping.put(Character[].class, new FieldTypeDefinition("CLOB", 64000));
fieldTypeMapping.put(byte[].class, new FieldTypeDefinition("BLOB", 64000));
fieldTypeMapping.put(char[].class, new FieldTypeDefinition("CLOB", 64000));
fieldTypeMapping.put(java.sql.Blob.class, new FieldTypeDefinition("BLOB", 64000));
fieldTypeMapping.put(java.sql.Clob.class, new FieldTypeDefinition("CLOB", 64000));
fieldTypeMapping.put(java.sql.Date.class, new FieldTypeDefinition("DATE", false));
fieldTypeMapping.put(java.sql.Time.class, new FieldTypeDefinition("TIME", false));
fieldTypeMapping.put(java.sql.Timestamp.class, new FieldTypeDefinition("TIMESTAMP", false));
return fieldTypeMapping;
}
}