| 1 | /* |
| 2 | * Copyright 2007 brunella ltd |
| 3 | * |
| 4 | * Licensed under the LGPL Version 3 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * |
| 7 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 8 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 9 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 10 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 11 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 12 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 13 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 14 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 15 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 16 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| 17 | * THE POSSIBILITY OF SUCH DAMAGE. |
| 18 | */ |
| 19 | package sf.qof.dialect; |
| 20 | |
| 21 | /** |
| 22 | * Implements Oracle specific SQL syntax. |
| 23 | */ |
| 24 | public class OracleDialect implements SQLDialect { |
| 25 | |
| 26 | public String getLimitString(String sql, boolean hasOffset) { |
| 27 | sql = sql.trim(); |
| 28 | boolean isForUpdate = false; |
| 29 | if ( sql.toLowerCase().endsWith(" for update") ) { |
| 30 | sql = sql.substring( 0, sql.length()-11 ); |
| 31 | isForUpdate = true; |
| 32 | } |
| 33 | |
| 34 | StringBuffer pagingSelect = new StringBuffer( sql.length()+100 ); |
| 35 | if (hasOffset) { |
| 36 | pagingSelect.append("select * from ( select qof_row_.*, rownum qof_rownum_ from ( "); |
| 37 | } |
| 38 | else { |
| 39 | pagingSelect.append("select * from ( "); |
| 40 | } |
| 41 | pagingSelect.append(sql); |
| 42 | if (hasOffset) { |
| 43 | pagingSelect.append(" ) qof_row_ where rownum <= ?) where qof_rownum_ > ?"); |
| 44 | } |
| 45 | else { |
| 46 | pagingSelect.append(" ) where rownum <= ?"); |
| 47 | } |
| 48 | |
| 49 | if ( isForUpdate ) { |
| 50 | pagingSelect.append( " for update" ); |
| 51 | } |
| 52 | |
| 53 | return pagingSelect.toString(); |
| 54 | } |
| 55 | |
| 56 | public boolean limitParametersBeforeQueryParameters() { |
| 57 | return false; |
| 58 | } |
| 59 | |
| 60 | public boolean limitAddOffset() { |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | public boolean limitOffsetFirst() { |
| 65 | return false; |
| 66 | } |
| 67 | |
| 68 | } |