1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/*
*
* 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.
*
*/
package org.apache.qpid.server.store.derby;
import java.io.File;
import java.nio.charset.Charset;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.qpid.server.store.StoreException;
public class DerbyUtils
{
public static final String MEMORY_STORE_LOCATION = ":memory:";
public static final String DERBY_SINGLE_DB_SHUTDOWN_CODE = "08006";
private static final String SQL_DRIVER_NAME = "org.apache.derby.jdbc.EmbeddedDriver";
private static final String TABLE_EXISTENCE_QUERY = "SELECT 1 FROM SYS.SYSTABLES WHERE TABLENAME = ?";
private static final Charset UTF8_CHARSET = Charset.forName("UTF-8");
public static void loadDerbyDriver()
{
try
{
Class<Driver> driverClass = (Class<Driver>) Class.forName(SQL_DRIVER_NAME);
}
catch (ClassNotFoundException e)
{
throw new StoreException("Failed to load driver " + SQL_DRIVER_NAME, e);
}
}
public static String createConnectionUrl(final String name, final String databasePath)
{
// Derby wont use an existing directory, so we append parent name
if (MEMORY_STORE_LOCATION.equals(databasePath))
{
return "jdbc:derby:" + MEMORY_STORE_LOCATION + "/" + name + ";create=true";
}
else
{
File environmentPath = new File(databasePath);
if (!environmentPath.exists())
{
if (!environmentPath.mkdirs())
{
throw new IllegalArgumentException("Environment path "
+ environmentPath
+ " could not be read or created. "
+ "Ensure the path is correct and that the permissions are correct.");
}
}
return "jdbc:derby:" + databasePath + "/" + name + ";create=true";
}
}
public static void shutdownDatabase(String connectionURL) throws SQLException
{
try
{
Connection conn = DriverManager.getConnection(connectionURL + ";shutdown=true");
// Shouldn't reach this point - shutdown=true should throw SQLException
conn.close();
}
catch (SQLException e)
{
if (e.getSQLState().equalsIgnoreCase(DerbyUtils.DERBY_SINGLE_DB_SHUTDOWN_CODE))
{
//expected and represents a clean shutdown of this database only, do nothing.
}
else
{
throw e;
}
}
}
public static String getBlobAsString(ResultSet rs, int col) throws SQLException
{
Blob blob = rs.getBlob(col);
if(blob == null)
{
return null;
}
byte[] bytes = blob.getBytes(1, (int) blob.length());
return new String(bytes, UTF8_CHARSET);
}
protected static byte[] getBlobAsBytes(ResultSet rs, int col) throws SQLException
{
Blob dataAsBlob = rs.getBlob(col);
return dataAsBlob.getBytes(1,(int) dataAsBlob.length());
}
public static boolean tableExists(final String tableName, final Connection conn) throws SQLException
{
PreparedStatement stmt = conn.prepareStatement(TABLE_EXISTENCE_QUERY);
try
{
stmt.setString(1, tableName);
ResultSet rs = stmt.executeQuery();
try
{
return rs.next();
}
finally
{
rs.close();
}
}
finally
{
stmt.close();
}
}
}
|
