namespace DataTool
{
public class SQLiteBulkInsert
{
private SQLiteConnection m_dbCon;
private SQLiteCommand m_cmd;
private SQLiteTransaction m_trans;

private Dictionary m_parameters = new Dictionary();

private uint m_counter = 0;

private string m_beginInsertText;

public SQLiteBulkInsert(SQLiteConnection dbConnection, string tableName)
{
m_dbCon = dbConnection;
m_tableName = tableName;

StringBuilder query = new StringBuilder(255);
query.Append("INSERT INTO ["); query.Append(tableName); query.Append("] (");
m_beginInsertText = query.ToString();
}

private bool m_allowBulkInsert = true;
public bool AllowBulkInsert { get { return m_allowBulkInsert; } set { m_allowBulkInsert = value; } }

public string CommandText
{
get
{
if (m_parameters.Count < 1)
throw new SQLiteException("You must add at least one parameter.");

StringBuilder sb = new StringBuilder(255);
sb.Append(m_beginInsertText);

foreach (string param in m_parameters.Keys)
{
sb.Append('[');
sb.Append(param);
sb.Append(']');
sb.Append(", ");
}
sb.Remove(sb.Length - 2, 2);

sb.Append(") VALUES (");

foreach (string param in m_parameters.Keys)
{
sb.Append(m_paramDelim);
sb.Append(param);
sb.Append(", ");
}
sb.Remove(sb.Length - 2, 2);

sb.Append(")");

return sb.ToString();
}
}

private uint m_commitMax = 10000;
public uint CommitMax { get { return m_commitMax; } set { m_commitMax = value; } }

private string m_tableName;
public string TableName { get { return m_tableName; } }

private string m_paramDelim = ":";
public string ParamDelimiter { get { return m_paramDelim; } }

public void AddParameter(string name, DbType dbType)
{
SQLiteParameter param = new SQLiteParameter(m_paramDelim + name, dbType);
m_parameters.Add(name, param);
}

public void Flush()
{
try
{
if (m_trans != null)
m_trans.Commit();
}
catch (Exception ex) { throw new Exception("Could not commit transaction. See InnerException for more details", ex); }
finally
{
if (m_trans != null)
m_trans.Dispose();

m_trans = null;
m_counter = 0;
}
}

public void Insert(object[] paramValues)
{
if (paramValues.Length != m_parameters.Count)
throw new Exception("The values array count must be equal to the count of the number of parameters.");

m_counter++;

if (m_counter == 1)
{
if (m_allowBulkInsert)
m_trans = m_dbCon.BeginTransaction();

m_cmd = m_dbCon.CreateCommand();
foreach (SQLiteParameter par in m_parameters.Values)
m_cmd.Parameters.Add(par);

m_cmd.CommandText = this.CommandText;
}

int i = 0;
foreach (SQLiteParameter par in m_parameters.Values)
{
par.Value = paramValues[i];
i++;
}

m_cmd.ExecuteNonQuery();

if (m_counter == m_commitMax)
{
try
{
if (m_trans != null)
m_trans.Commit();
}
catch (Exception) { }
finally
{
if (m_trans != null)
{
m_trans.Dispose();
m_trans = null;
}