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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; } }





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