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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 OpenSimulator 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
28using System;
29using System.Data;
30using Mono.Data.SqliteClient;
31
32namespace OpenSim.Data.SQLiteLegacy
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 /// <summary>
48 ///
49 /// </summary>
50 /// <param name="dt"></param>
51 /// <param name="name"></param>
52 /// <param name="type"></param>
53 public static void createCol(DataTable dt, string name, Type type)
54 {
55 DataColumn col = new DataColumn(name, type);
56 dt.Columns.Add(col);
57 }
58
59 /***********************************************************************
60 *
61 * SQL Statement Creation Functions
62 *
63 * These functions create SQL statements for update, insert, and create.
64 * They can probably be factored later to have a db independant
65 * portion and a db specific portion
66 *
67 **********************************************************************/
68
69 /// <summary>
70 /// Create an insert command
71 /// </summary>
72 /// <param name="table">table name</param>
73 /// <param name="dt">data table</param>
74 /// <returns>the created command</returns>
75 /// <remarks>
76 /// This is subtle enough to deserve some commentary.
77 /// Instead of doing *lots* and *lots of hardcoded strings
78 /// for database definitions we'll use the fact that
79 /// realistically all insert statements look like "insert
80 /// into A(b, c) values(:b, :c) on the parameterized query
81 /// front. If we just have a list of b, c, etc... we can
82 /// generate these strings instead of typing them out.
83 /// </remarks>
84 public static SqliteCommand createInsertCommand(string table, DataTable dt)
85 {
86
87 string[] cols = new string[dt.Columns.Count];
88 for (int i = 0; i < dt.Columns.Count; i++)
89 {
90 DataColumn col = dt.Columns[i];
91 cols[i] = col.ColumnName;
92 }
93
94 string sql = "insert into " + table + "(";
95 sql += String.Join(", ", cols);
96 // important, the first ':' needs to be here, the rest get added in the join
97 sql += ") values (:";
98 sql += String.Join(", :", cols);
99 sql += ")";
100 SqliteCommand cmd = new SqliteCommand(sql);
101
102 // this provides the binding for all our parameters, so
103 // much less code than it used to be
104 foreach (DataColumn col in dt.Columns)
105 {
106 cmd.Parameters.Add(createSqliteParameter(col.ColumnName, col.DataType));
107 }
108 return cmd;
109 }
110
111 /// <summary>
112 /// create an update command
113 /// </summary>
114 /// <param name="table">table name</param>
115 /// <param name="pk"></param>
116 /// <param name="dt"></param>
117 /// <returns>the created command</returns>
118 public static SqliteCommand createUpdateCommand(string table, string pk, DataTable dt)
119 {
120 string sql = "update " + table + " set ";
121 string subsql = String.Empty;
122 foreach (DataColumn col in dt.Columns)
123 {
124 if (subsql.Length > 0)
125 {
126 // a map function would rock so much here
127 subsql += ", ";
128 }
129 subsql += col.ColumnName + "= :" + col.ColumnName;
130 }
131 sql += subsql;
132 sql += " where " + pk;
133 SqliteCommand cmd = new SqliteCommand(sql);
134
135 // this provides the binding for all our parameters, so
136 // much less code than it used to be
137
138 foreach (DataColumn col in dt.Columns)
139 {
140 cmd.Parameters.Add(createSqliteParameter(col.ColumnName, col.DataType));
141 }
142 return cmd;
143 }
144
145 /// <summary>
146 ///
147 /// </summary>
148 /// <param name="dt">Data Table</param>
149 /// <returns></returns>
150 public static string defineTable(DataTable dt)
151 {
152 string sql = "create table " + dt.TableName + "(";
153 string subsql = String.Empty;
154 foreach (DataColumn col in dt.Columns)
155 {
156 if (subsql.Length > 0)
157 {
158 // a map function would rock so much here
159 subsql += ",\n";
160 }
161 subsql += col.ColumnName + " " + sqliteType(col.DataType);
162 if (dt.PrimaryKey.Length > 0)
163 {
164 if (col == dt.PrimaryKey[0])
165 {
166 subsql += " primary key";
167 }
168 }
169 }
170 sql += subsql;
171 sql += ")";
172 return sql;
173 }
174
175 /***********************************************************************
176 *
177 * Database Binding functions
178 *
179 * These will be db specific due to typing, and minor differences
180 * in databases.
181 *
182 **********************************************************************/
183
184 ///<summary>
185 /// <para>
186 /// This is a convenience function that collapses 5 repetitive
187 /// lines for defining SqliteParameters to 2 parameters:
188 /// column name and database type.
189 /// </para>
190 ///
191 /// <para>
192 /// It assumes certain conventions like :param as the param
193 /// name to replace in parametrized queries, and that source
194 /// version is always current version, both of which are fine
195 /// for us.
196 /// </para>
197 ///</summary>
198 /// <param name="name"></param>
199 /// <param name="type"></param>
200 ///<returns>a built sqlite parameter</returns>
201 public static SqliteParameter createSqliteParameter(string name, Type type)
202 {
203 SqliteParameter param = new SqliteParameter();
204 param.ParameterName = ":" + name;
205 param.DbType = dbtypeFromType(type);
206 param.SourceColumn = name;
207 param.SourceVersion = DataRowVersion.Current;
208 return param;
209 }
210
211 /***********************************************************************
212 *
213 * Type conversion functions
214 *
215 **********************************************************************/
216
217 /// <summary>
218 /// Type conversion function
219 /// </summary>
220 /// <param name="type">a type</param>
221 /// <returns>a DbType</returns>
222 public static DbType dbtypeFromType(Type type)
223 {
224 if (type == typeof (String))
225 {
226 return DbType.String;
227 }
228 else if (type == typeof (Int32))
229 {
230 return DbType.Int32;
231 }
232 else if (type == typeof (UInt32))
233 {
234 return DbType.UInt32;
235 }
236 else if (type == typeof (Int64))
237 {
238 return DbType.Int64;
239 }
240 else if (type == typeof (UInt64))
241 {
242 return DbType.UInt64;
243 }
244 else if (type == typeof (Double))
245 {
246 return DbType.Double;
247 }
248 else if (type == typeof (Boolean))
249 {
250 return DbType.Boolean;
251 }
252 else if (type == typeof (Byte[]))
253 {
254 return DbType.Binary;
255 }
256 else
257 {
258 return DbType.String;
259 }
260 }
261
262 /// <summary>
263 /// </summary>
264 /// <param name="type">a Type</param>
265 /// <returns>a string</returns>
266 /// <remarks>this is something we'll need to implement for each db slightly differently.</remarks>
267 public static string sqliteType(Type type)
268 {
269 if (type == typeof (String))
270 {
271 return "varchar(255)";
272 }
273 else if (type == typeof (Int32))
274 {
275 return "integer";
276 }
277 else if (type == typeof (UInt32))
278 {
279 return "integer";
280 }
281 else if (type == typeof (Int64))
282 {
283 return "varchar(255)";
284 }
285 else if (type == typeof (UInt64))
286 {
287 return "varchar(255)";
288 }
289 else if (type == typeof (Double))
290 {
291 return "float";
292 }
293 else if (type == typeof (Boolean))
294 {
295 return "integer";
296 }
297 else if (type == typeof (Byte[]))
298 {
299 return "blob";
300 }
301 else
302 {
303 return "string";
304 }
305 }
306 }
307}
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