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| //Courtesy of http://www.codoxide.com/post/My-Favorite-Database-Wrapper-for-C.aspx
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Common;
namespace DbNamespace
{
//comm -- / <summary>
//comm -- / Abstract base class for encapsulating provider independant database interactin logic.
//comm -- / </summary>
//comm -- / <typeparam name="CONNECTION_TYPE"><see cref="DbConnection"/> derived Connection type.</typeparam>
//comm -- / <typeparam name="COMMAND_TYPE"><see cref="DbCommand"/> derived Command type.</typeparam>
//comm -- / <typeparam name="ADAPTER_TYPE"><see cref="DbDataAdapater"/> derived Data Adapter type.</typeparam>
public abstract class AbstractDatabase<CONNECTION_TYPE, COMMAND_TYPE, ADAPTER_TYPE> : IDisposable
where CONNECTION_TYPE : DbConnection, new()
where COMMAND_TYPE : DbCommand
where ADAPTER_TYPE : DbDataAdapter, new()
{
//comm -- / <summary>Gets the Connection object associated with the current instance.</summary>
public DbConnection Connection
{
get
{
if (internal_currentConnection == null)
{
internal_currentConnection = new CONNECTION_TYPE();
internal_currentConnection.ConnectionString = GetConnectionString();
}
return internal_currentConnection;
}
}
private DbConnection internal_currentConnection;
//comm -- / <summary>When overridden in derived classes returns the connection string for the database.</summary>
//comm -- / <returns>The connection string for the database.</returns>
protected abstract string GetConnectionString();
//comm -- / <summary>Gets a DbCommand object with the specified <see cref="DbCommand.CommandText"/>.</summary>
//comm -- / <param name="sqlString">The SQL string.</param>
//comm -- / <returns>A DbCommand object with the specified <see cref="DbCommand.CommandText"/>.</returns>
public DbCommand GetSqlStringCommand(string sqlString)
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
DbCommand cmd = this.Connection.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = sqlString;
return cmd;
}
//comm -- / <summary>Gets a DbCommand object with the specified <see cref="DbCommand.CommandText"/>.</summary>
//comm -- / <param name="sqlStringFormat">The SQL string format.</param>
//comm -- / <param name="args">The format arguments.</param>
//comm -- / <returns>A DbCommand object with the specified <see cref="DbCommand.CommandText"/>.</returns>
public DbCommand GetSqlStringCommand(string sqlStringFormat, params object[] args)
{
return GetSqlStringCommand(string.Format(sqlStringFormat, args));
}
//comm -- / <summary>Gets a DbCommand object for the specified Stored Procedure.</summary>
//comm -- / <param name="storedProcName">The name of the stored procedure.</param>
//comm -- / <returns>A DbCommand object for the specified Stored Procedure.</returns>
public DbCommand GetStoredProcedureCommand(string storedProcName)
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
DbCommand cmd = this.Connection.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = storedProcName;
return cmd;
}
//comm -- / <summary>Adds an input parameter to the given <see cref="DbCommand"/>.</summary>
//comm -- / <param name="cmd">The command object the parameter should be added to.</param>
//comm -- / <param name="paramName">The identifier of the parameter.</param>
//comm -- / <param name="paramType">The type of the parameter.</param>
//comm -- / <param name="value">The value of the parameter.</param>
//comm -- / <returns>The <see cref="DbParameter"/> that was created.</returns>
public DbParameter AddInParameter(DbCommand cmd, string paramName, DbType paramType, object value)
{
DbParameter param = cmd.CreateParameter();
param.DbType = paramType;
param.ParameterName = paramName;
param.Value = value;
param.Direction = ParameterDirection.Input;
cmd.Parameters.Add(param);
return param;
}
//comm -- / <summary>Adds an input parameter to the given <see cref="DbCommand"/>.</summary>
//comm -- / <param name="cmd">The command object the parameter should be added to.</param>
//comm -- / <param name="paramName">The identifier of the parameter.</param>
//comm -- / <param name="paramType">The type of the parameter.</param>
//comm -- / <param name="size">The maximum size in bytes, of the data table column to be affected.</param>
//comm -- / <param name="value">The value of the parameter.</param>
//comm -- / <returns>The <see cref="DbParameter"/> that was created.</returns>
public DbParameter AddInParameter(DbCommand cmd, string paramName, DbType paramType, int size, object value)
{
DbParameter param = cmd.CreateParameter();
param.DbType = paramType;
param.ParameterName = paramName;
param.Size = size;
param.Value = value;
param.Direction = ParameterDirection.Input;
cmd.Parameters.Add(param);
return param;
}
public DbParameter AddInOutParameter ( DbCommand cmd, string paramName, DbType paramType, int size, object value )
{
DbParameter param = cmd.CreateParameter ( );
param.DbType = paramType;
param.ParameterName = paramName;
param.Size = size;
param.Value = value;
param.Direction = ParameterDirection.Output;
cmd.Parameters.Add ( param );
return param;
}
public DbParameter AddInOutParameter ( DbCommand cmd, string paramName, DbType paramType, object value )
{
DbParameter param = cmd.CreateParameter ( );
param.DbType = paramType;
param.ParameterName = paramName;
param.Value = value;
param.Direction = ParameterDirection.Output;
cmd.Parameters.Add ( param );
return param;
}
//comm -- / <summary>Executes the specified command against the current connection.</summary>
//comm -- / <param name="cmd">The command to be executed.</param>
//comm -- / <returns>Result returned by the database engine.</returns>
public int ExecuteNonQuery(DbCommand cmd)
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
return cmd.ExecuteNonQuery();
}
//comm -- / <summary>Executes the specified command against the current connection.</summary>
//comm -- / <param name="cmd">The command to be executed.</param>
//comm -- / <param name="txn">The database transaction inside which the command should be executed.</param>
//comm -- / <returns>Result returned by the database engine.</returns>
public int ExecuteNonQuery(DbCommand cmd, DbTransaction txn)
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
cmd.Transaction = txn;
return cmd.ExecuteNonQuery();
}
//comm -- / <summary>Executes the specified command against the current connection.</summary>
//comm -- / <param name="cmd">The command to be executed.</param>
//comm -- / <returns>Result returned by the database engine.</returns>
public DbDataReader ExecuteReader(DbCommand cmd)
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
return cmd.ExecuteReader();
}
//comm -- / <summary>Executes the specified command against the current connection.</summary>
//comm -- / <param name="cmd">The command to be executed.</param>
//comm -- / <param name="behavior">One of the <see cref="System.Data.CommandBehavior"/> values.</param>
//comm -- / <returns>Result returned by the database engine.</returns>
public DbDataReader ExecuteReader(DbCommand cmd , CommandBehavior behavior )
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
return cmd.ExecuteReader(behavior);
}
//comm -- / <summary>Executes the specified command against the current connection.</summary>
//comm -- / <param name="cmd">The command to be executed.</param>
//comm -- / <returns>Result returned by the database engine.</returns>
public T ExecuteScalar<T>(DbCommand cmd, T defaultValue)
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
object retVal = cmd.ExecuteScalar();
if (null == retVal || DBNull.Value == retVal)
return defaultValue;
else
return (T)retVal;
}
//comm -- / <summary>Executes the specified command against the current connection.</summary>
//comm -- / <param name="cmd">The command to be executed.</param>
//comm -- / <returns>Result returned by the database engine.</returns>
public DataSet ExecuteDataSet(DbCommand cmd)
{
ADAPTER_TYPE adapter = new ADAPTER_TYPE();
adapter.SelectCommand = (COMMAND_TYPE)cmd;
DataSet retVal = new DataSet();
adapter.Fill(retVal);
return retVal;
}
//comm -- / <summary>Begins a transaction.</summary>
//comm -- / <returns>Created transaction.</returns>
public DbTransaction BeginTransaction()
{
if (this.Connection.State != ConnectionState.Open)
this.Connection.Open();
return Connection.BeginTransaction();
}
//comm -- / <summary>Disposes the resources associated with the current database connection.</summary>
~AbstractDatabase()
{
Dispose();
}
//comm -- / <summary>Disposes the resources associated with the current database connection.</summary>
public void Dispose()
{
if (null != internal_currentConnection)
{
internal_currentConnection.Dispose();
internal_currentConnection = null;
}
}
} //eof public abstract class AbstractDatabase
} //eof namespace DbNamespace |
