Clase con helpers para la conexcion a una base de datos en sqlite

Conexion sqlite c#

class SQLiteDatabase
    {

        String dbConnection;
    /// <summary>

    ///     Default Constructor for SQLiteDatabase Class.

    /// </summary>
    public SQLiteDatabase()
    {

       dbConnection = "Data Source=documents.s3db";

    }

 

    /// <summary>

    ///     Single Param Constructor for specifying the DB file.

    // </summary>

    /// <param name="inputFile">The File containing the DB</param>

    public SQLiteDatabase(String inputFile)

    {

        dbConnection = String.Format("Data Source={0}", inputFile);

    }

 

    /// <summary>

    ///     Single Param Constructor for specifying advanced connection options.

    /// </summary>

    /// <param name="connectionOpts">A dictionary containing all desired options and their values</param>

    public SQLiteDatabase(Dictionary<String, String> connectionOpts)

    {

        String str = "";

        foreach (KeyValuePair<String, String> row in connectionOpts)

        {

            str += String.Format("{0}={1}; ", row.Key, row.Value);

        }

        str = str.Trim().Substring(0, str.Length - 1);

        dbConnection = str;

    }

 

    /// <summary>

   ///     Allows the programmer to run a query against the Database.

    /// </summary>

    /// <param name="sql">The SQL to run</param>

    /// <returns>A DataTable containing the result set.</returns>

    public DataTable GetDataTable(string sql)

    {

        DataTable dt = new DataTable();

        try
        {

            SQLiteConnection cnn = new SQLiteConnection(dbConnection);

            cnn.Open();

            SQLiteCommand mycommand = new SQLiteCommand(cnn);

            mycommand.CommandText = sql;

            SQLiteDataReader reader = mycommand.ExecuteReader();

            dt.Load(reader);

            reader.Close();

            cnn.Close();

        }

        catch (Exception e)

        {

            throw new Exception(e.Message);

        }

        return dt;

    }

     

    /// <summary>

    ///     Allows the programmer to interact with the database for purposes other than a query.

    /// </summary>

    /// <param name="sql">The SQL to be run.</param>

    /// <returns>An Integer containing the number of rows updated.</returns>

    public int ExecuteNonQuery(string sql)

    {

        SQLiteConnection cnn = new SQLiteConnection(dbConnection);

        cnn.Open();

        SQLiteCommand mycommand = new SQLiteCommand(cnn);

        mycommand.CommandText = sql;

        int rowsUpdated = mycommand.ExecuteNonQuery();

        cnn.Close();

        return rowsUpdated;

    }

 

    /// <summary>

    ///     Allows the programmer to retrieve single items from the DB.

    /// </summary>

    /// <param name="sql">The query to run.</param>

    /// <returns>A string.</returns>

    public string ExecuteScalar(string sql)

    {

        SQLiteConnection cnn = new SQLiteConnection(dbConnection);

        cnn.Open();

        SQLiteCommand mycommand = new SQLiteCommand(cnn);

        mycommand.CommandText = sql;

        object value = mycommand.ExecuteScalar();
        cnn.Close();

        if (value != null)

        {

            return value.ToString();

        }

        return "";

    }

 

    /// <summary>

    ///     Allows the programmer to easily update rows in the DB.

    /// </summary>

    /// <param name="tableName">The table to update.</param>

    /// <param name="data">A dictionary containing Column names and their new values.</param>

    /// <param name="where">The where clause for the update statement.</param>

    /// <returns>A boolean true or false to signify success or failure.</returns>

    public bool Update(String tableName, Dictionary<String, String> data, String where)

    {

        String vals = "";

        Boolean returnCode = true;

        if (data.Count >= 1)

        {

            foreach (KeyValuePair<String, String> val in data)

            {

                vals += String.Format(" {0} = '{1}',", val.Key.ToString(), val.Value.ToString());

            }

            vals = vals.Substring(0, vals.Length - 1);

       }

        try

        {

            this.ExecuteNonQuery(String.Format("update {0} set {1} where {2};", tableName, vals, where));

        }

        catch

        {

            returnCode = false;

        }

        return returnCode;

    }

 

    /// <summary>

    ///     Allows the programmer to easily delete rows from the DB.

    /// </summary>

    /// <param name="tableName">The table from which to delete.</param>

    /// <param name="where">The where clause for the delete.</param>

    /// <returns>A boolean true or false to signify success or failure.</returns>

    public bool Delete(String tableName, String where)

    {

        Boolean returnCode = true;

        try

        {

            this.ExecuteNonQuery(String.Format("delete from {0} where {1};", tableName, where));

        }

        catch (Exception fail)

        {

            MessageBox.Show(fail.Message);

            returnCode = false;

        }

        return returnCode;

    }

 

    /// <summary>

    ///     Allows the programmer to easily insert into the DB

    /// </summary>

    /// <param name="tableName">The table into which we insert the data.</param>

    /// <param name="data">A dictionary containing the column names and data for the insert.</param>

    /// <returns>A boolean true or false to signify success or failure.</returns>

    public bool Insert(String tableName, Dictionary<String, String> data)

    {

        String columns = "";

        String values = "";

        Boolean returnCode = true;

        foreach (KeyValuePair<String, String> val in data)

        {

            columns += String.Format(" {0},", val.Key.ToString());

            values += String.Format(" '{0}',", val.Value);

        }

        columns = columns.Substring(0, columns.Length - 1);

        values = values.Substring(0, values.Length - 1);

        try

      {

            this.ExecuteNonQuery(String.Format("insert into {0}({1}) values({2});", tableName, columns, values));

        }

        catch(Exception fail)

        {
            MessageBox.Show(fail.Message);

            returnCode = false;

        }

        return returnCode;

    }

 

    /// <summary>

    ///     Allows the programmer to easily delete all data from the DB.

    /// </summary>

    /// <returns>A boolean true or false to signify success or failure.</returns>

    public bool ClearDB()

    {

        DataTable tables;

        try

        {

            tables = this.GetDataTable("select NAME from SQLITE_MASTER where type='table' order by NAME;");

            foreach (DataRow table in tables.Rows)

            {

                this.ClearTable(table["NAME"].ToString());

            }

            return true;

        }

        catch

        {

            return false;

        }

    }

 

    /// <summary>

    ///     Allows the user to easily clear all data from a specific table.

    /// </summary>
    /// <param name="table">The name of the table to clear.</param>

    /// <returns>A boolean true or false to signify success or failure.</returns>
    public bool ClearTable(String table)

    {

        try

        {

             

            this.ExecuteNonQuery(String.Format("delete from {0};", table));

            return true;

        }

        catch

        {

            return false;

        }

    }      

    }