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Diffstat (limited to 'OpenSim/Framework/Data.SQLite/SQLiteBase.cs')
-rw-r--r-- | OpenSim/Framework/Data.SQLite/SQLiteBase.cs | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/OpenSim/Framework/Data.SQLite/SQLiteBase.cs b/OpenSim/Framework/Data.SQLite/SQLiteBase.cs new file mode 100644 index 0000000..54bb719 --- /dev/null +++ b/OpenSim/Framework/Data.SQLite/SQLiteBase.cs | |||
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1 | /* | ||
2 | * Copyright (c) Contributors, http://www.openmetaverse.org/ | ||
3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. | ||
4 | * | ||
5 | * Redistribution and use in source and binary forms, with or without | ||
6 | * modification, are permitted provided that the following conditions are met: | ||
7 | * * Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * * Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * * Neither the name of the OpenSim Project nor the | ||
13 | * names of its contributors may be used to endorse or promote products | ||
14 | * derived from this software without specific prior written permission. | ||
15 | * | ||
16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS AND ANY | ||
17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY | ||
20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||
23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
26 | * | ||
27 | */ | ||
28 | using System; | ||
29 | using System.IO; | ||
30 | using libsecondlife; | ||
31 | using OpenSim.Framework.Utilities; | ||
32 | using System.Data; | ||
33 | using System.Data.SqlTypes; | ||
34 | using Mono.Data.SqliteClient; | ||
35 | using OpenSim.Framework.Console; | ||
36 | |||
37 | namespace OpenSim.Framework.Data.SQLite | ||
38 | { | ||
39 | /// <summary> | ||
40 | /// A base class for methods needed by all SQLite database classes | ||
41 | /// </summary> | ||
42 | public class SQLiteBase | ||
43 | { | ||
44 | /*********************************************************************** | ||
45 | * | ||
46 | * Database Definition Functions | ||
47 | * | ||
48 | * This should be db agnostic as we define them in ADO.NET terms | ||
49 | * | ||
50 | **********************************************************************/ | ||
51 | |||
52 | protected static void createCol(DataTable dt, string name, System.Type type) | ||
53 | { | ||
54 | DataColumn col = new DataColumn(name, type); | ||
55 | dt.Columns.Add(col); | ||
56 | } | ||
57 | |||
58 | /*********************************************************************** | ||
59 | * | ||
60 | * SQL Statement Creation Functions | ||
61 | * | ||
62 | * These functions create SQL statements for update, insert, and create. | ||
63 | * They can probably be factored later to have a db independant | ||
64 | * portion and a db specific portion | ||
65 | * | ||
66 | **********************************************************************/ | ||
67 | |||
68 | protected static SqliteCommand createInsertCommand(string table, DataTable dt) | ||
69 | { | ||
70 | /** | ||
71 | * This is subtle enough to deserve some commentary. | ||
72 | * Instead of doing *lots* and *lots of hardcoded strings | ||
73 | * for database definitions we'll use the fact that | ||
74 | * realistically all insert statements look like "insert | ||
75 | * into A(b, c) values(:b, :c) on the parameterized query | ||
76 | * front. If we just have a list of b, c, etc... we can | ||
77 | * generate these strings instead of typing them out. | ||
78 | */ | ||
79 | string[] cols = new string[dt.Columns.Count]; | ||
80 | for (int i = 0; i < dt.Columns.Count; i++) { | ||
81 | DataColumn col = dt.Columns[i]; | ||
82 | cols[i] = col.ColumnName; | ||
83 | } | ||
84 | |||
85 | string sql = "insert into " + table + "("; | ||
86 | sql += String.Join(", ", cols); | ||
87 | // important, the first ':' needs to be here, the rest get added in the join | ||
88 | sql += ") values (:"; | ||
89 | sql += String.Join(", :", cols); | ||
90 | sql += ")"; | ||
91 | SqliteCommand cmd = new SqliteCommand(sql); | ||
92 | |||
93 | // this provides the binding for all our parameters, so | ||
94 | // much less code than it used to be | ||
95 | foreach (DataColumn col in dt.Columns) | ||
96 | { | ||
97 | cmd.Parameters.Add(createSqliteParameter(col.ColumnName, col.DataType)); | ||
98 | } | ||
99 | return cmd; | ||
100 | } | ||
101 | |||
102 | protected static SqliteCommand createUpdateCommand(string table, string pk, DataTable dt) | ||
103 | { | ||
104 | string sql = "update " + table + " set "; | ||
105 | string subsql = ""; | ||
106 | foreach (DataColumn col in dt.Columns) | ||
107 | { | ||
108 | if (subsql.Length > 0) | ||
109 | { // a map function would rock so much here | ||
110 | subsql += ", "; | ||
111 | } | ||
112 | subsql += col.ColumnName + "= :" + col.ColumnName; | ||
113 | } | ||
114 | sql += subsql; | ||
115 | sql += " where " + pk; | ||
116 | SqliteCommand cmd = new SqliteCommand(sql); | ||
117 | |||
118 | // this provides the binding for all our parameters, so | ||
119 | // much less code than it used to be | ||
120 | |||
121 | foreach (DataColumn col in dt.Columns) | ||
122 | { | ||
123 | cmd.Parameters.Add(createSqliteParameter(col.ColumnName, col.DataType)); | ||
124 | } | ||
125 | return cmd; | ||
126 | } | ||
127 | |||
128 | |||
129 | protected static string defineTable(DataTable dt) | ||
130 | { | ||
131 | string sql = "create table " + dt.TableName + "("; | ||
132 | string subsql = ""; | ||
133 | foreach (DataColumn col in dt.Columns) | ||
134 | { | ||
135 | if (subsql.Length > 0) | ||
136 | { // a map function would rock so much here | ||
137 | subsql += ",\n"; | ||
138 | } | ||
139 | subsql += col.ColumnName + " " + sqliteType(col.DataType); | ||
140 | if(col == dt.PrimaryKey[0]) | ||
141 | { | ||
142 | subsql += " primary key"; | ||
143 | } | ||
144 | } | ||
145 | sql += subsql; | ||
146 | sql += ")"; | ||
147 | return sql; | ||
148 | } | ||
149 | |||
150 | /*********************************************************************** | ||
151 | * | ||
152 | * Database Binding functions | ||
153 | * | ||
154 | * These will be db specific due to typing, and minor differences | ||
155 | * in databases. | ||
156 | * | ||
157 | **********************************************************************/ | ||
158 | |||
159 | ///<summary> | ||
160 | /// This is a convenience function that collapses 5 repetitive | ||
161 | /// lines for defining SqliteParameters to 2 parameters: | ||
162 | /// column name and database type. | ||
163 | /// | ||
164 | /// It assumes certain conventions like :param as the param | ||
165 | /// name to replace in parametrized queries, and that source | ||
166 | /// version is always current version, both of which are fine | ||
167 | /// for us. | ||
168 | ///</summary> | ||
169 | ///<returns>a built sqlite parameter</returns> | ||
170 | protected static SqliteParameter createSqliteParameter(string name, System.Type type) | ||
171 | { | ||
172 | SqliteParameter param = new SqliteParameter(); | ||
173 | param.ParameterName = ":" + name; | ||
174 | param.DbType = dbtypeFromType(type); | ||
175 | param.SourceColumn = name; | ||
176 | param.SourceVersion = DataRowVersion.Current; | ||
177 | return param; | ||
178 | } | ||
179 | |||
180 | /*********************************************************************** | ||
181 | * | ||
182 | * Type conversion functions | ||
183 | * | ||
184 | **********************************************************************/ | ||
185 | |||
186 | protected static DbType dbtypeFromType(Type type) | ||
187 | { | ||
188 | if (type == typeof(System.String)) { | ||
189 | return DbType.String; | ||
190 | } else if (type == typeof(System.Int32)) { | ||
191 | return DbType.Int32; | ||
192 | } else if (type == typeof(System.UInt32)) { | ||
193 | return DbType.UInt32; | ||
194 | } else if (type == typeof(System.Int64)) { | ||
195 | return DbType.Int64; | ||
196 | } else if (type == typeof(System.UInt64)) { | ||
197 | return DbType.UInt64; | ||
198 | } else if (type == typeof(System.Double)) { | ||
199 | return DbType.Double; | ||
200 | } else if (type == typeof(System.Byte[])) { | ||
201 | return DbType.Binary; | ||
202 | } else { | ||
203 | return DbType.String; | ||
204 | } | ||
205 | } | ||
206 | |||
207 | // this is something we'll need to implement for each db | ||
208 | // slightly differently. | ||
209 | protected static string sqliteType(Type type) | ||
210 | { | ||
211 | if (type == typeof(System.String)) { | ||
212 | return "varchar(255)"; | ||
213 | } else if (type == typeof(System.Int32)) { | ||
214 | return "integer"; | ||
215 | } else if (type == typeof(System.UInt32)) { | ||
216 | return "integer"; | ||
217 | } else if (type == typeof(System.Int64)) { | ||
218 | return "varchar(255)"; | ||
219 | } else if (type == typeof(System.UInt64)) { | ||
220 | return "varchar(255)"; | ||
221 | } else if (type == typeof(System.Double)) { | ||
222 | return "float"; | ||
223 | } else if (type == typeof(System.Byte[])) { | ||
224 | return "blob"; | ||
225 | } else { | ||
226 | return "string"; | ||
227 | } | ||
228 | } | ||
229 | } | ||
230 | } | ||