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Diffstat (limited to 'OpenSim/Data/SQLite/SQLiteUtils.cs')
-rw-r--r-- | OpenSim/Data/SQLite/SQLiteUtils.cs | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/OpenSim/Data/SQLite/SQLiteUtils.cs b/OpenSim/Data/SQLite/SQLiteUtils.cs new file mode 100644 index 0000000..1334e53 --- /dev/null +++ b/OpenSim/Data/SQLite/SQLiteUtils.cs | |||
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1 | /* | ||
2 | * Copyright (c) Contributors, http://opensimulator.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.Data; | ||
30 | using Mono.Data.SqliteClient; | ||
31 | |||
32 | namespace OpenSim.Framework.Data.SQLite | ||
33 | { | ||
34 | /// <summary> | ||
35 | /// A base class for methods needed by all SQLite database classes | ||
36 | /// </summary> | ||
37 | public class SQLiteUtil | ||
38 | { | ||
39 | /*********************************************************************** | ||
40 | * | ||
41 | * Database Definition Helper Functions | ||
42 | * | ||
43 | * This should be db agnostic as we define them in ADO.NET terms | ||
44 | * | ||
45 | **********************************************************************/ | ||
46 | |||
47 | public static void createCol(DataTable dt, string name, Type type) | ||
48 | { | ||
49 | DataColumn col = new DataColumn(name, type); | ||
50 | dt.Columns.Add(col); | ||
51 | } | ||
52 | |||
53 | /*********************************************************************** | ||
54 | * | ||
55 | * SQL Statement Creation Functions | ||
56 | * | ||
57 | * These functions create SQL statements for update, insert, and create. | ||
58 | * They can probably be factored later to have a db independant | ||
59 | * portion and a db specific portion | ||
60 | * | ||
61 | **********************************************************************/ | ||
62 | |||
63 | public static SqliteCommand createInsertCommand(string table, DataTable dt) | ||
64 | { | ||
65 | /** | ||
66 | * This is subtle enough to deserve some commentary. | ||
67 | * Instead of doing *lots* and *lots of hardcoded strings | ||
68 | * for database definitions we'll use the fact that | ||
69 | * realistically all insert statements look like "insert | ||
70 | * into A(b, c) values(:b, :c) on the parameterized query | ||
71 | * front. If we just have a list of b, c, etc... we can | ||
72 | * generate these strings instead of typing them out. | ||
73 | */ | ||
74 | string[] cols = new string[dt.Columns.Count]; | ||
75 | for (int i = 0; i < dt.Columns.Count; i++) | ||
76 | { | ||
77 | DataColumn col = dt.Columns[i]; | ||
78 | cols[i] = col.ColumnName; | ||
79 | } | ||
80 | |||
81 | string sql = "insert into " + table + "("; | ||
82 | sql += String.Join(", ", cols); | ||
83 | // important, the first ':' needs to be here, the rest get added in the join | ||
84 | sql += ") values (:"; | ||
85 | sql += String.Join(", :", cols); | ||
86 | sql += ")"; | ||
87 | SqliteCommand cmd = new SqliteCommand(sql); | ||
88 | |||
89 | // this provides the binding for all our parameters, so | ||
90 | // much less code than it used to be | ||
91 | foreach (DataColumn col in dt.Columns) | ||
92 | { | ||
93 | cmd.Parameters.Add(createSqliteParameter(col.ColumnName, col.DataType)); | ||
94 | } | ||
95 | return cmd; | ||
96 | } | ||
97 | |||
98 | public static SqliteCommand createUpdateCommand(string table, string pk, DataTable dt) | ||
99 | { | ||
100 | string sql = "update " + table + " set "; | ||
101 | string subsql = String.Empty; | ||
102 | foreach (DataColumn col in dt.Columns) | ||
103 | { | ||
104 | if (subsql.Length > 0) | ||
105 | { | ||
106 | // a map function would rock so much here | ||
107 | subsql += ", "; | ||
108 | } | ||
109 | subsql += col.ColumnName + "= :" + col.ColumnName; | ||
110 | } | ||
111 | sql += subsql; | ||
112 | sql += " where " + pk; | ||
113 | SqliteCommand cmd = new SqliteCommand(sql); | ||
114 | |||
115 | // this provides the binding for all our parameters, so | ||
116 | // much less code than it used to be | ||
117 | |||
118 | foreach (DataColumn col in dt.Columns) | ||
119 | { | ||
120 | cmd.Parameters.Add(createSqliteParameter(col.ColumnName, col.DataType)); | ||
121 | } | ||
122 | return cmd; | ||
123 | } | ||
124 | |||
125 | |||
126 | public static string defineTable(DataTable dt) | ||
127 | { | ||
128 | string sql = "create table " + dt.TableName + "("; | ||
129 | string subsql = String.Empty; | ||
130 | foreach (DataColumn col in dt.Columns) | ||
131 | { | ||
132 | if (subsql.Length > 0) | ||
133 | { | ||
134 | // a map function would rock so much here | ||
135 | subsql += ",\n"; | ||
136 | } | ||
137 | subsql += col.ColumnName + " " + sqliteType(col.DataType); | ||
138 | if (dt.PrimaryKey.Length > 0) | ||
139 | { | ||
140 | if (col == dt.PrimaryKey[0]) | ||
141 | { | ||
142 | subsql += " primary key"; | ||
143 | } | ||
144 | } | ||
145 | } | ||
146 | sql += subsql; | ||
147 | sql += ")"; | ||
148 | return sql; | ||
149 | } | ||
150 | |||
151 | /*********************************************************************** | ||
152 | * | ||
153 | * Database Binding functions | ||
154 | * | ||
155 | * These will be db specific due to typing, and minor differences | ||
156 | * in databases. | ||
157 | * | ||
158 | **********************************************************************/ | ||
159 | |||
160 | ///<summary> | ||
161 | /// This is a convenience function that collapses 5 repetitive | ||
162 | /// lines for defining SqliteParameters to 2 parameters: | ||
163 | /// column name and database type. | ||
164 | /// | ||
165 | /// It assumes certain conventions like :param as the param | ||
166 | /// name to replace in parametrized queries, and that source | ||
167 | /// version is always current version, both of which are fine | ||
168 | /// for us. | ||
169 | ///</summary> | ||
170 | ///<returns>a built sqlite parameter</returns> | ||
171 | public static SqliteParameter createSqliteParameter(string name, Type type) | ||
172 | { | ||
173 | SqliteParameter param = new SqliteParameter(); | ||
174 | param.ParameterName = ":" + name; | ||
175 | param.DbType = dbtypeFromType(type); | ||
176 | param.SourceColumn = name; | ||
177 | param.SourceVersion = DataRowVersion.Current; | ||
178 | return param; | ||
179 | } | ||
180 | |||
181 | /*********************************************************************** | ||
182 | * | ||
183 | * Type conversion functions | ||
184 | * | ||
185 | **********************************************************************/ | ||
186 | |||
187 | public static DbType dbtypeFromType(Type type) | ||
188 | { | ||
189 | if (type == typeof (String)) | ||
190 | { | ||
191 | return DbType.String; | ||
192 | } | ||
193 | else if (type == typeof (Int32)) | ||
194 | { | ||
195 | return DbType.Int32; | ||
196 | } | ||
197 | else if (type == typeof (UInt32)) | ||
198 | { | ||
199 | return DbType.UInt32; | ||
200 | } | ||
201 | else if (type == typeof (Int64)) | ||
202 | { | ||
203 | return DbType.Int64; | ||
204 | } | ||
205 | else if (type == typeof (UInt64)) | ||
206 | { | ||
207 | return DbType.UInt64; | ||
208 | } | ||
209 | else if (type == typeof (Double)) | ||
210 | { | ||
211 | return DbType.Double; | ||
212 | } | ||
213 | else if (type == typeof (Boolean)) | ||
214 | { | ||
215 | return DbType.Boolean; | ||
216 | } | ||
217 | else if (type == typeof (Byte[])) | ||
218 | { | ||
219 | return DbType.Binary; | ||
220 | } | ||
221 | else | ||
222 | { | ||
223 | return DbType.String; | ||
224 | } | ||
225 | } | ||
226 | |||
227 | // this is something we'll need to implement for each db | ||
228 | // slightly differently. | ||
229 | public static string sqliteType(Type type) | ||
230 | { | ||
231 | if (type == typeof (String)) | ||
232 | { | ||
233 | return "varchar(255)"; | ||
234 | } | ||
235 | else if (type == typeof (Int32)) | ||
236 | { | ||
237 | return "integer"; | ||
238 | } | ||
239 | else if (type == typeof (UInt32)) | ||
240 | { | ||
241 | return "integer"; | ||
242 | } | ||
243 | else if (type == typeof (Int64)) | ||
244 | { | ||
245 | return "varchar(255)"; | ||
246 | } | ||
247 | else if (type == typeof (UInt64)) | ||
248 | { | ||
249 | return "varchar(255)"; | ||
250 | } | ||
251 | else if (type == typeof (Double)) | ||
252 | { | ||
253 | return "float"; | ||
254 | } | ||
255 | else if (type == typeof (Boolean)) | ||
256 | { | ||
257 | return "integer"; | ||
258 | } | ||
259 | else if (type == typeof (Byte[])) | ||
260 | { | ||
261 | return "blob"; | ||
262 | } | ||
263 | else | ||
264 | { | ||
265 | return "string"; | ||
266 | } | ||
267 | } | ||
268 | } | ||
269 | } | ||