| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.db.ConnectionInfo |
| 4 | |
| 5 | Copyright 2000, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.iapi.db; |
| 22 | |
| 23 | import org.apache.derby.iapi.sql.conn.LanguageConnectionContext; |
| 24 | import org.apache.derby.iapi.sql.conn.ConnectionUtil; |
| 25 | import org.apache.derby.iapi.error.StandardException; |
| 26 | import org.apache.derby.iapi.error.PublicAPI; |
| 27 | import java.sql.SQLException; |
| 28 | |
| 29 | /** |
| 30 | * |
| 31 | * ConnectionInfo class provides static methods for getting information |
| 32 | * related to a JDBC connection. |
| 33 | * |
| 34 | * When called from within the query language, |
| 35 | * each method returns information about the connection from which it was called. |
| 36 | * <p> |
| 37 | * Use the methods of this class only within an SQL-J statement; do not call |
| 38 | * them directly. |
| 39 | */ |
| 40 | |
| 41 | public abstract class ConnectionInfo |
| 42 | { |
| 43 | |
| 44 | /** no requirement for a constructor */ |
| 45 | private ConnectionInfo() {} |
| 46 | |
| 47 | /** |
| 48 | * Get the last autoincrement value inserted into the column by |
| 49 | * a statement in this connection. |
| 50 | |
| 51 | <BR><B> In JDBC 3.0 an application should use the standard methods provided by |
| 52 | JDBC 3.0 to obtain generated key values. See java.sql.Statement.getGeneratedKeys().</B> |
| 53 | * |
| 54 | * @param schemaName Name of the schema. |
| 55 | * @param tableName Name of the table. |
| 56 | * @param columnName Name of the column. |
| 57 | * |
| 58 | * @return the last value to be inserted into the named autoincrement |
| 59 | * column by this connection. Returns null if this connection has never |
| 60 | * inserted into this column. |
| 61 | * |
| 62 | * @exception SQLException if the current connection could not be |
| 63 | * established properly. |
| 64 | */ |
| 65 | public static Long lastAutoincrementValue(String schemaName, |
| 66 | String tableName, |
| 67 | String columnName) |
| 68 | throws SQLException |
| 69 | { |
| 70 | // a static method can manipulate lcc? |
| 71 | LanguageConnectionContext lcc = ConnectionUtil.getCurrentLCC(); |
| 72 | return lcc.lastAutoincrementValue(schemaName, tableName, columnName); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * <B>INTERNAL USE ONLY</B> |
| 77 | * (<B>THIS METHOD MAY BE REMOVED IN A FUTURE RELEASE</B>.) |
| 78 | * @throws SQLException on error |
| 79 | **/ |
| 80 | public static long nextAutoincrementValue(String schemaName, |
| 81 | String tableName, |
| 82 | String columnName |
| 83 | ) |
| 84 | throws SQLException |
| 85 | { |
| 86 | LanguageConnectionContext lcc = ConnectionUtil.getCurrentLCC(); |
| 87 | try |
| 88 | { |
| 89 | return |
| 90 | lcc.nextAutoincrementValue(schemaName, tableName, columnName); |
| 91 | } |
| 92 | catch (StandardException se) |
| 93 | { |
| 94 | throw PublicAPI.wrapStandardException(se); |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | |