|
1
|
/**
|
|
2
|
* '$RCSfile$'
|
|
3
|
* Purpose: An adapter class for MS SQL Server RDBMS.
|
|
4
|
* Copyright: 2000 Regents of the University of California and the
|
|
5
|
* National Center for Ecological Analysis and Synthesis
|
|
6
|
* Authors: Jivka Bojilova
|
|
7
|
* Release: @release@
|
|
8
|
*
|
|
9
|
* '$Author: tao $'
|
|
10
|
* '$Date: 2002-05-23 20:39:35 -0700 (Thu, 23 May 2002) $'
|
|
11
|
* '$Revision: 1129 $'
|
|
12
|
*
|
|
13
|
* This program is free software; you can redistribute it and/or modify
|
|
14
|
* it under the terms of the GNU General Public License as published by
|
|
15
|
* the Free Software Foundation; either version 2 of the License, or
|
|
16
|
* (at your option) any later version.
|
|
17
|
*
|
|
18
|
* This program is distributed in the hope that it will be useful,
|
|
19
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
20
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
21
|
* GNU General Public License for more details.
|
|
22
|
*
|
|
23
|
* You should have received a copy of the GNU General Public License
|
|
24
|
* along with this program; if not, write to the Free Software
|
|
25
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
26
|
*/
|
|
27
|
|
|
28
|
package edu.ucsb.nceas.dbadapter;
|
|
29
|
|
|
30
|
import java.sql.*;
|
|
31
|
import edu.ucsb.nceas.metacat.*;
|
|
32
|
|
|
33
|
/**
|
|
34
|
* The MS SQL Server db adapter implementation.
|
|
35
|
*/
|
|
36
|
public class SqlserverAdapter extends AbstractDatabase {
|
|
37
|
|
|
38
|
/**
|
|
39
|
* The SQL Server unique ID generator through use of IDENTITY key
|
|
40
|
* The IDENTITY key is a column in the table. When record is inserted
|
|
41
|
* in the table, SELECT @@IDENTITY can return the key generated in
|
|
42
|
* that IDENTITY column in the same db connection.
|
|
43
|
* This is the only way to get unique id: let the SQL Server assign
|
|
44
|
* a value in IDENTITY column and get it afterwards for use in the
|
|
45
|
* application.
|
|
46
|
*
|
|
47
|
* @param conn db connection in which to generate the unique id
|
|
48
|
* @param tableName the name of table which unique id to generate
|
|
49
|
* @exception SQLException <br/> any SQLException that can be thrown
|
|
50
|
* during the db operation
|
|
51
|
* @return return the generated unique id as a long type
|
|
52
|
*/
|
|
53
|
public long getUniqueID(String tableName)
|
|
54
|
throws SQLException {
|
|
55
|
long uniqueid = 0;
|
|
56
|
DBConnection conn = null;
|
|
57
|
int serialNumber = -1;
|
|
58
|
Statement stmt = null;
|
|
59
|
try
|
|
60
|
{
|
|
61
|
//check out DBConnection
|
|
62
|
conn=DBConnectionPool.getDBConnection("SqlserverAdapter.getUniqueID");
|
|
63
|
serialNumber=conn.getCheckOutSerialNumber();
|
|
64
|
stmt = conn.createStatement();
|
|
65
|
stmt.execute("SELECT @@IDENTITY");
|
|
66
|
ResultSet rs = stmt.getResultSet();
|
|
67
|
if ( rs.next() ) {
|
|
68
|
uniqueid = rs.getLong(1);
|
|
69
|
}
|
|
70
|
stmt.close();
|
|
71
|
}
|
|
72
|
finally
|
|
73
|
{
|
|
74
|
DBConnectionPool.returnDBConnection(conn, serialNumber);
|
|
75
|
}
|
|
76
|
//System.out.println("Unique ID: " + uniqueid);
|
|
77
|
return uniqueid;
|
|
78
|
}
|
|
79
|
|
|
80
|
/**
|
|
81
|
* The SQL Server's function name that gets the current date and time
|
|
82
|
* from the database server: "getdate()"
|
|
83
|
*
|
|
84
|
* @return return the current date and time function name: "getdate()"
|
|
85
|
*/
|
|
86
|
public String getDateTimeFunction() {
|
|
87
|
|
|
88
|
//System.out.println("The date and time function: " + "getdate()");
|
|
89
|
return "getdate()";
|
|
90
|
}
|
|
91
|
|
|
92
|
/**
|
|
93
|
* The SQL Server's function name that is used to return non-NULL value
|
|
94
|
*
|
|
95
|
* @return return the non-NULL function name: "isnull"
|
|
96
|
*/
|
|
97
|
public String getIsNULLFunction() {
|
|
98
|
|
|
99
|
return "isnull";
|
|
100
|
}
|
|
101
|
|
|
102
|
/**
|
|
103
|
* The SQL Server's string delimiter character: single quote (')
|
|
104
|
*
|
|
105
|
* @return return the string delimiter: single quote (')
|
|
106
|
*/
|
|
107
|
public String getStringDelimiter() {
|
|
108
|
|
|
109
|
return "'";
|
|
110
|
}
|
|
111
|
|
|
112
|
}
|
|
113
|
|