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/*
* Copyright (c) Tribal Media AB, http://tribalmedia.se/
*
* 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.
* * The name of Tribal Media AB may not 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.Collections.Generic;
using System.Data;
using System.Data.Common;
namespace TribalMedia.Framework.Data
{
public abstract class DatabaseMapper
{
protected string m_connectionString;
public DatabaseMapper(string connectionString)
{
m_connectionString = connectionString;
}
public abstract DbConnection GetNewConnection();
public abstract string CreateParamName(string fieldName);
public DbCommand CreateSelectCommand(TableMapper mapper, DbConnection connection, string fieldName, object key)
{
string table = mapper.TableName;
DbCommand command = connection.CreateCommand();
string conditionString = CreateCondition(mapper, command, fieldName, key);
string query =
String.Format("select * from {0} where {1}", table, conditionString);
command.CommandText = query;
command.CommandType = CommandType.Text;
return command;
}
public string CreateCondition(TableMapper mapper, DbCommand command, string fieldName, object key)
{
string keyFieldParamName = mapper.CreateParamName(fieldName);
DbParameter param = command.CreateParameter();
param.ParameterName = keyFieldParamName;
param.Value = ConvertToDbType(key);
command.Parameters.Add(param);
return String.Format("{0}={1}", fieldName, keyFieldParamName);
}
public DbCommand CreateUpdateCommand(TableMapper mapper, DbConnection connection, object rowMapper, object primaryKey)
{
string table = mapper.TableName;
List<string> fieldNames = new List<string>();
DbCommand command = connection.CreateCommand();
foreach (FieldMapper fieldMapper in mapper.Schema.Fields.Values)
{
if (fieldMapper != mapper.KeyFieldMapper)
{
fieldMapper.ExpandField(rowMapper, command, fieldNames);
}
}
List<string> assignments = new List<string>();
foreach (string field in fieldNames)
{
assignments.Add(String.Format("{0}={1}", field, mapper.CreateParamName(field)));
}
string conditionString = mapper.CreateCondition(command, mapper.KeyFieldMapper.FieldName, primaryKey);
command.CommandText =
String.Format("update {0} set {1} where {2}", table, String.Join(", ", assignments.ToArray()),
conditionString);
return command;
}
public DbCommand CreateInsertCommand(TableMapper mapper, DbConnection connection, object obj)
{
string table = mapper.TableName;
List<string> fieldNames = new List<string>();
DbCommand command = connection.CreateCommand();
foreach (FieldMapper fieldMapper in mapper.Schema.Fields.Values)
{
fieldMapper.ExpandField(obj, command, fieldNames);
}
List<string> paramNames = new List<string>();
foreach (string field in fieldNames)
{
paramNames.Add(mapper.CreateParamName(field));
}
command.CommandText =
String.Format("insert into {0} ({1}) values ({2})", table, String.Join(", ", fieldNames.ToArray()),
String.Join(", ", paramNames.ToArray()));
return command;
}
public virtual object ConvertToDbType(object value)
{
return value;
}
}
}
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