| package org.apache.ddlutils.platform.hsqldb; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.io.IOException; |
| |
| import org.apache.ddlutils.Platform; |
| import org.apache.ddlutils.alteration.ColumnDefinitionChange; |
| import org.apache.ddlutils.model.Column; |
| import org.apache.ddlutils.model.ModelException; |
| import org.apache.ddlutils.model.Table; |
| import org.apache.ddlutils.model.TypeMap; |
| import org.apache.ddlutils.platform.SqlBuilder; |
| |
| /** |
| * The SQL Builder for the HsqlDb database. |
| * |
| * @version $Revision$ |
| */ |
| public class HsqlDbBuilder extends SqlBuilder |
| { |
| /** |
| * Creates a new builder instance. |
| * |
| * @param platform The plaftform this builder belongs to |
| */ |
| public HsqlDbBuilder(Platform platform) |
| { |
| super(platform); |
| addEscapedCharSequence("'", "''"); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void dropTable(Table table) throws IOException |
| { |
| print("DROP TABLE "); |
| printIdentifier(getTableName(table)); |
| print(" IF EXISTS"); |
| printEndOfStatement(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public String getSelectLastIdentityValues(Table table) |
| { |
| return "CALL IDENTITY()"; |
| } |
| |
| /** |
| * Writes the SQL to add/insert a column. |
| * |
| * @param table The table |
| * @param newColumn The new column |
| * @param nextColumn The column before which the new column shall be added; <code>null</code> |
| * if the new column is to be added instead of inserted |
| */ |
| public void insertColumn(Table table, Column newColumn, Column nextColumn) throws IOException |
| { |
| print("ALTER TABLE "); |
| printlnIdentifier(getTableName(table)); |
| printIndent(); |
| print("ADD COLUMN "); |
| writeColumn(table, newColumn); |
| if (nextColumn != null) |
| { |
| print(" BEFORE "); |
| printIdentifier(getColumnName(nextColumn)); |
| } |
| printEndOfStatement(); |
| } |
| |
| /** |
| * Writes the SQL to drop a column. |
| * |
| * @param table The table |
| * @param column The column to drop |
| */ |
| public void dropColumn(Table table, Column column) throws IOException |
| { |
| print("ALTER TABLE "); |
| printlnIdentifier(getTableName(table)); |
| printIndent(); |
| print("DROP COLUMN "); |
| printIdentifier(getColumnName(column)); |
| printEndOfStatement(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| protected void writeColumn(Table table, Column column) throws IOException |
| { |
| //see comments in columnsDiffer about null/"" defaults |
| printIdentifier(getColumnName(column)); |
| print(" "); |
| print(getSqlType(column)); |
| if (column.isAutoIncrement()) |
| { |
| if (!column.isPrimaryKey()) |
| { |
| throw new ModelException("Column "+column.getName()+" in table "+table.getName()+" is auto-incrementing but not a primary key column, which is not supported by the platform"); |
| } |
| print(" "); |
| writeColumnAutoIncrementStmt(table, column); |
| } |
| else |
| { |
| writeColumnDefaultValueStmt(table, column); |
| } |
| if (column.isRequired()) |
| { |
| print(" "); |
| writeColumnNotNullableStmt(); |
| } |
| else if (getPlatformInfo().isNullAsDefaultValueRequired() && |
| getPlatformInfo().hasNullDefault(column.getTypeCode())) |
| { |
| print(" "); |
| writeColumnNullableStmt(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| protected void writeColumnAutoIncrementStmt(Table table, Column column) throws IOException |
| { |
| print("GENERATED BY DEFAULT AS IDENTITY(START WITH 1)"); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| protected void writeCastExpression(Column sourceColumn, Column targetColumn) throws IOException |
| { |
| boolean sizeChanged = ColumnDefinitionChange.isSizeChanged(getPlatformInfo(), sourceColumn, targetColumn); |
| boolean typeChanged = ColumnDefinitionChange.isTypeChanged(getPlatformInfo(), sourceColumn, targetColumn); |
| |
| if (sizeChanged || typeChanged) |
| { |
| boolean needSubstr = TypeMap.isTextType(targetColumn.getTypeCode()) && sizeChanged && (sourceColumn.getSizeAsInt() > targetColumn.getSizeAsInt()); |
| |
| if (needSubstr) |
| { |
| print("SUBSTR("); |
| } |
| print("CAST("); |
| printIdentifier(getColumnName(sourceColumn)); |
| print(" AS "); |
| if (needSubstr) |
| { |
| print(getNativeType(targetColumn)); |
| } |
| else |
| { |
| print(getSqlType(targetColumn)); |
| } |
| print(")"); |
| if (needSubstr) |
| { |
| print(",1,"); |
| print(targetColumn.getSize()); |
| print(")"); |
| } |
| } |
| else |
| { |
| super.writeCastExpression(sourceColumn, targetColumn); |
| } |
| } |
| } |