sqlselectbuilderoracleimpl.java

CRM源码This file describes some issues that should be implemented in future and how it should be imple

/*
 * Copyright 2006-2007 Queplix Corp.
 *
 * Licensed under the Queplix Public License, Version 1.1.1 (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.queplix.com/solutions/commercial-open-source/queplix-public-license/
 *
 * 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.
 */

package com.queplix.core.modules.eql.parser.oracle;

import com.queplix.core.jxb.entity.Efield;
import com.queplix.core.jxb.entity.types.SqlSType;
import com.queplix.core.modules.eql.EQLReq;
import com.queplix.core.modules.eql.EQLReqFrom;
import com.queplix.core.modules.eql.EQLReqSelectAttr;
import com.queplix.core.modules.eql.EQLStringObject;
import com.queplix.core.modules.eql.error.EQLException;
import com.queplix.core.modules.eql.funcs.DateDiffFunc;
import com.queplix.core.modules.eql.funcs.FTSFunc;
import com.queplix.core.modules.eql.funcs.IsNullFunc;
import com.queplix.core.modules.eql.parser.generic.SQLSelectBuilderGenericImpl;

/**
 * <p>Select SQL builder ORACLE 9i implementation</p>
 * @author Baranov Andrey [ALB]
 * @version $Revision: 1.1.1.1 $ $Date: 2005/09/12 15:30:32 $
 */

public class SQLSelectBuilderOracleImpl
    extends SQLSelectBuilderGenericImpl {

    /*
     * (No javadoc)
     * @see SQLBuilderGenericImpl#addFromClause
     */
    protected void addFromClause()
        throws EQLException {

        EQLReqFrom reqFrom = req.getFrom();
        int fromSize = reqFrom.fromSize();

        if( fromSize > 0 ) {
            super.addFromClause();
        } else {
            fromClause.append( "DUAL" );
        }
    }

    /*
     * No javadoc
     * @see SQLBuilderGenericImpl#getSQLOperandMember
     */
    protected String getSQLOperandMember( FTSFunc memberField )
        throws EQLException {

        String fieldName = getSQLOperand( memberField.getParameter( 0 ) );
        String ftsStr = getSQLValue( ( EQLStringObject ) memberField.getParameter( 1 ).getSubOp( 0 ).getMember() );

        /** @todo write parser for FTS search string */

        return "contains(" + fieldName + "," + ftsStr + ") > 0";
    }

    /*
     * (No javadoc)
     * @see SQLSelectBuilderGenericImpl#getSQLColumnSelect
     */
    protected String getSQLColumnSelect( EQLReq req, EQLReqSelectAttr reqSelectAttr )
        throws EQLException {

        Efield field = reqSelectAttr.getReqField().getField();
        int sql_type = field.getSqltype().getType();
        boolean isLazy = req.isLazy( field );
        boolean isDistinct = req.getSelect().isDistinct();
        
        if( sql_type == SqlSType.MEMO_LONG_TYPE ) {
            return super.getSQLColumnSelect( req, reqSelectAttr );
        }
        if( sql_type == SqlSType.MEMO_TYPE ) {
            if( isLazy ) {
                // Add DBMS_LOB.GETLENGTH() for MEMO
                String sqlColumnName = getSQLOperand( reqSelectAttr.getReqOp() );
                return "DBMS_LOB.GETLENGTH(" + sqlColumnName + ")";
            }
            else if( isDistinct ) {
                // Add DATALENGTH() and TEXTPTR()
                String sqlColumnName = getSQLOperand( reqSelectAttr.getReqOp() );
                StringBuffer sql = new StringBuffer();
                sql.append( "DBMS_LOB.GETLENGTH(" ).append( sqlColumnName ).append( ")" );
                sql.append( "," );
                sql.append( " NULL" );
                //sql.append( "TEXTPTR(" ).append( sqlColumnName ).append( ")" );
                return sql.toString();
            }
        } else if( sql_type == SqlSType.BINARY_TYPE ) {
            

            if( isLazy ) {
                // Add DBMS_LOB.GETLENGTH() for BINARY
                String sqlColumnName = getSQLOperand( reqSelectAttr.getReqOp() );
                return "DBMS_LOB.GETLENGTH(" + sqlColumnName + ")";

            } else if( isDistinct ) {
                // Not supported!
                throw new IllegalStateException( "Binary fields not supported with DISTINCT" );
            }

        } else if( isLazy ) {
            if( !field.getVirtual().booleanValue() ) {
                // Use CASE expression for none-virtual fields
                String sqlColumnName = getSQLOperand( reqSelectAttr.getReqOp() );
                return "(CASE WHEN " + sqlColumnName + " IS NULL THEN 0 ELSE 1 END)";
            } else {
                // Field is vitual - always return '1'
                return "1";
            }
        }

        // Return default column
        return super.getSQLColumnSelect( req, reqSelectAttr );
    }
    
    protected String getSQLOperandMember( DateDiffFunc memberField )
        throws EQLException {
        return getSQLOperand( memberField.getParameter( 1 ) ) + " - " + getSQLOperand( memberField.getParameter( 0 ) );
    }

    protected String getSQLOperandMember( IsNullFunc memberField )
        throws EQLException {
        return "Nvl(" + getSQLOperand( memberField.getParameter( 0 ) ) + "," + getSQLOperand( memberField.getParameter( 1 ) ) + ")";
    }
    
}