sybasebuilder.java

OBPM是一个开源

package org.apache.ddlutils.platform.sybase;

/*
 * 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 java.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.ddlutils.Platform;
import org.apache.ddlutils.alteration.AddColumnChange;
import org.apache.ddlutils.alteration.AddPrimaryKeyChange;
import org.apache.ddlutils.alteration.ColumnAutoIncrementChange;
import org.apache.ddlutils.alteration.ColumnChange;
import org.apache.ddlutils.alteration.ColumnDefaultValueChange;
import org.apache.ddlutils.alteration.PrimaryKeyChange;
import org.apache.ddlutils.alteration.RemoveColumnChange;
import org.apache.ddlutils.alteration.RemovePrimaryKeyChange;
import org.apache.ddlutils.alteration.TableChange;
import org.apache.ddlutils.model.Column;
import org.apache.ddlutils.model.Database;
import org.apache.ddlutils.model.ForeignKey;
import org.apache.ddlutils.model.Index;
import org.apache.ddlutils.model.Table;
import org.apache.ddlutils.platform.CreationParameters;
import org.apache.ddlutils.platform.SqlBuilder;
import org.apache.ddlutils.util.Jdbc3Utils;

/**
 * The SQL Builder for Sybase.
 * 
 * @version $Revision: 509917 $
 */
public class SybaseBuilder extends SqlBuilder
{
    /**
     * Creates a new builder application.
     * 
     * @param platform The plaftform this builder belongs to
     */
    public SybaseBuilder(Platform platform)
    {
        super(platform);
        addEscapedCharSequence("'", "''");
    }

    /**
     * {@inheritDoc}
     */
    public void createTable(Database database, Table table, Map parameters) throws IOException
    {
        writeQuotationOnStatement();
        super.createTable(database, table, parameters);
    }

	/**
	 * {@inheritDoc}
	 */
	protected void writeColumn(Table table, Column column) throws IOException
	{
        printIdentifier(getColumnName(column));
        print(" ");
        print(getSqlType(column));
        writeColumnDefaultValueStmt(table, column);
        // Sybase does not like NULL/NOT NULL and IDENTITY together
        if (column.isAutoIncrement())
        {
            print(" ");
            writeColumnAutoIncrementStmt(table, column);
        }
        else
        {
            print(" ");
            if (column.isRequired())
            {
                writeColumnNotNullableStmt();
            }
            else
            {
                // we'll write a NULL for all columns that are not required 
                writeColumnNullableStmt();
            }
        }
	}

	/**
     * {@inheritDoc}
     */
    protected String getNativeDefaultValue(Column column)
    {
        if ((column.getTypeCode() == Types.BIT) ||
            (Jdbc3Utils.supportsJava14JdbcTypes() && (column.getTypeCode() == Jdbc3Utils.determineBooleanTypeCode())))
        {
            return getDefaultValueHelper().convert(column.getDefaultValue(), column.getTypeCode(), Types.SMALLINT).toString();
        }
        else
        {
            return super.getNativeDefaultValue(column);
        }
    }

    /**
     * {@inheritDoc}
     */
    public void dropTable(Table table) throws IOException
    {
        writeQuotationOnStatement();
        print("IF EXISTS (SELECT 1 FROM sysobjects WHERE type = 'U' AND name = ");
        printAlwaysSingleQuotedIdentifier(getTableName(table));
        println(")");
        println("BEGIN");
        printIndent();
        print("DROP TABLE ");
        printlnIdentifier(getTableName(table));
        print("END");
        printEndOfStatement();
    }

    /**
     * {@inheritDoc}
     */
    protected void writeExternalForeignKeyDropStmt(Table table, ForeignKey foreignKey) throws IOException
    {
        String constraintName = getForeignKeyName(table, foreignKey);

        print("IF EXISTS (SELECT 1 FROM sysobjects WHERE type = 'RI' AND name = ");
        printAlwaysSingleQuotedIdentifier(constraintName);
        println(")");
        printIndent();
        print("ALTER TABLE ");
        printIdentifier(getTableName(table));
        print(" DROP CONSTRAINT ");
        printIdentifier(constraintName);
        printEndOfStatement();
    }

    /**
     * {@inheritDoc}
     */
    public void writeExternalIndexDropStmt(Table table, Index index) throws IOException
    {
        print("DROP INDEX ");
        printIdentifier(getTableName(table));
        print(".");
        printIdentifier(getIndexName(index));
        printEndOfStatement();
    }

    /**
     * {@inheritDoc}
     */
    public void dropExternalForeignKeys(Table table) throws IOException
    {
        writeQuotationOnStatement();
        super.dropExternalForeignKeys(table);
    }

    /**
     * {@inheritDoc}
     */
    public String getSelectLastIdentityValues(Table table)
    {
        return "SELECT @@IDENTITY";
    }

    /**
     * Returns the SQL to enable identity override mode.
     * 
     * @param table The table to enable the mode for
     * @return The SQL
     */
    protected String getEnableIdentityOverrideSql(Table table)
    {
        StringBuffer result = new StringBuffer();

        result.append("SET IDENTITY_INSERT ");
        result.append(getDelimitedIdentifier(getTableName(table)));
        result.append(" ON");

        return result.toString();
    }

    /**
     * Returns the SQL to disable identity override mode.
     * 
     * @param table The table to disable the mode for
     * @return The SQL
     */
    protected String getDisableIdentityOverrideSql(Table table)
    {
        StringBuffer result = new StringBuffer();

        result.append("SET IDENTITY_INSERT ");
        result.append(getDelimitedIdentifier(getTableName(table)));
        result.append(" OFF");

        return result.toString();
    }

    /**
     * Returns the statement that turns on the ability to write delimited identifiers.
     * 
     * @return The quotation-on statement
     */
    protected String getQuotationOnStatement()
    {
        if (getPlatform().isDelimitedIdentifierModeOn())
        {
            return "SET quoted_identifier on";
        }
        else
        {
            return "";
        }
    }

    /**
     * Writes the statement that turns on the ability to write delimited identifiers.
     */
    private void writeQuotationOnStatement() throws IOException
    {
        print(getQuotationOnStatement());
        printEndOfStatement();
    }

    /**
     * Prints the given identifier with enforced single quotes around it regardless of whether 
     * delimited identifiers are turned on or not.
     * 
     * @param identifier The identifier
     */
    private void printAlwaysSingleQuotedIdentifier(String identifier) throws IOException
    {
        print("'");
        print(identifier);
        print("'");
    }

    /**
     * {@inheritDoc}
     */
    protected void writeCopyDataStatement(Table sourceTable, Table targetTable) throws IOException
    {
        boolean hasIdentity = targetTable.getAutoIncrementColumns().length > 0;

        if (hasIdentity)
        {
            print("SET IDENTITY_INSERT ");
            printIdentifier(getTableName(targetTable));
            print(" ON");
            printEndOfStatement();
        }
        super.writeCopyDataStatement(sourceTable, targetTable);
        if (hasIdentity)
        {
            print("SET IDENTITY_INSERT ");
            printIdentifier(getTableName(targetTable));
            print(" OFF");
            printEndOfStatement();
        }
    }

    /**
     * {@inheritDoc}
     */
    protected void writeCastExpression(Column sourceColumn, Column targetColumn) throws IOException
    {
        String sourceNativeType = getBareNativeType(sourceColumn);
        String targetNativeType = getBareNativeType(targetColumn);

        if (sourceNativeType.equals(targetNativeType))
        {
            printIdentifier(getColumnName(sourceColumn));
        }
        else
        {
            print("CONVERT(");
            print(getNativeType(targetColumn));
            print(",");
            printIdentifier(getColumnName(sourceColumn));
            print(")");
        }
    }

    /**
     * {@inheritDoc}
     */
    protected void processChanges(Database currentModel, Database desiredModel, List changes, CreationParameters params) throws IOException
    {
        if (!changes.isEmpty())