/* * Copyright (c) Contributors, http://opensimulator.org/ * See CONTRIBUTORS.TXT for a full list of copyright holders. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the OpenSim Project nor the * names of its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ using System; using System.Data; using System.Data.Common; namespace OpenSim.Data.Base { public abstract class BaseTableMapper { private readonly BaseDatabaseConnector m_database; private readonly object m_syncRoot = new object(); protected void WithConnection(Action<DbConnection> action) { lock (m_syncRoot) { DbConnection m_connection = m_database.GetNewConnection(); if (m_connection.State != ConnectionState.Open) { m_connection.Open(); } action(m_connection); if (m_connection.State == ConnectionState.Open) { m_connection.Close(); } } } private readonly string m_tableName; public string TableName { get { return m_tableName; } } protected BaseSchema m_schema; public BaseSchema Schema { get { return m_schema; } } protected BaseFieldMapper m_keyFieldMapper; public BaseFieldMapper KeyFieldMapper { get { return m_keyFieldMapper; } } public BaseTableMapper(BaseDatabaseConnector database, string tableName) { m_database = database; m_tableName = tableName.ToLower(); // Stupid MySQL hack. } public string CreateParamName(string fieldName) { return m_database.CreateParamName(fieldName); } protected DbCommand CreateSelectCommand(DbConnection connection, string fieldName, object primaryKey) { return m_database.CreateSelectCommand(this, connection, fieldName, primaryKey); } public string CreateCondition(DbCommand command, string fieldName, object key) { return m_database.CreateCondition(this, command, fieldName, key); } public DbCommand CreateInsertCommand(DbConnection connection, object obj) { return m_database.CreateInsertCommand(this, connection, obj); } public DbCommand CreateUpdateCommand(DbConnection connection, object rowMapper, object primaryKey) { return m_database.CreateUpdateCommand(this, connection, rowMapper, primaryKey); } public object ConvertToDbType(object value) { return m_database.ConvertToDbType(value); } protected virtual BaseDataReader CreateReader(IDataReader reader) { return m_database.CreateReader(reader); } } public abstract class BaseTableMapper<TRowMapper, TPrimaryKey> : BaseTableMapper { public BaseTableMapper(BaseDatabaseConnector database, string tableName) : base(database, tableName) { } // HACK: This is a temporary function used by TryGetValue(). // Due to a bug in mono 1.2.6, delegate blocks cannot contain // a using block. This has been fixed in SVN, so the next // mono release should work. private void TryGetConnectionValue(DbConnection connection, TPrimaryKey primaryKey, ref TRowMapper result, ref bool success) { using ( DbCommand command = CreateSelectCommand(connection, KeyFieldMapper.FieldName, primaryKey)) { using (IDataReader reader = command.ExecuteReader()) { if (reader.Read()) { result = FromReader(CreateReader(reader)); success = true; } else { success = false; } } } } public bool TryGetValue(TPrimaryKey primaryKey, out TRowMapper value) { TRowMapper result = default(TRowMapper); bool success = false; WithConnection(delegate(DbConnection connection) { TryGetConnectionValue(connection, primaryKey, ref result, ref success); }); value = result; return success; } // HACK: This is a temporary function used by Remove(). // Due to a bug in mono 1.2.6, delegate blocks cannot contain // a using block. This has been fixed in SVN, so the next // mono release should work. protected virtual void TryDelete(DbConnection connection, TPrimaryKey id, ref int deleted) { using ( DbCommand command = CreateDeleteCommand(connection, KeyFieldMapper.FieldName, id)) { deleted = command.ExecuteNonQuery(); } } public virtual bool Remove(TPrimaryKey id) { int deleted = 0; WithConnection(delegate(DbConnection connection) { TryDelete(connection, id, ref deleted); }); if (deleted == 1) { return true; } else { return false; } } public DbCommand CreateDeleteCommand(DbConnection connection, string fieldName, TPrimaryKey primaryKey) { string table = TableName; DbCommand command = connection.CreateCommand(); string conditionString = CreateCondition(command, fieldName, primaryKey); string query = String.Format("delete from {0} where {1}", table, conditionString); command.CommandText = query; command.CommandType = CommandType.Text; return command; } // HACK: This is a temporary function used by Update(). // Due to a bug in mono 1.2.6, delegate blocks cannot contain // a using block. This has been fixed in SVN, so the next // mono release should work. protected void TryUpdate(DbConnection connection, TPrimaryKey primaryKey, TRowMapper value, ref int updated) { using (DbCommand command = CreateUpdateCommand(connection, value, primaryKey)) { updated = command.ExecuteNonQuery(); } } public virtual bool Update(TPrimaryKey primaryKey, TRowMapper value) { int updated = 0; WithConnection(delegate(DbConnection connection) { TryUpdate(connection, primaryKey, value, ref updated); }); if (updated == 1) { return true; } else { return false; } } // HACK: This is a temporary function used by Add(). // Due to a bug in mono 1.2.6, delegate blocks cannot contain // a using block. This has been fixed in SVN, so the next // mono release should work. protected void TryAdd(DbConnection connection, TRowMapper value, ref int added) { using (DbCommand command = CreateInsertCommand(connection, value)) { added = command.ExecuteNonQuery(); } } public virtual bool Add(TRowMapper value) { int added = 0; WithConnection(delegate(DbConnection connection) { TryAdd(connection, value, ref added); }); if (added == 1) { return true; } else { return false; } } public abstract TRowMapper FromReader(BaseDataReader reader); } }