/// <summary>
/// Executes this command against the specified database connection and returns the number of rows affected.
/// </summary>
public int Execute(DBConnection cn)
{
if (conditions.Count == 0)
{
throw new ApplicationException("Executing an inline delete command with no parameters in the where clause is not allowed.");
}
var cmd = cn.DatabaseInfo.CreateCommand(timeout);
var sb = new StringBuilder("DELETE FROM ");
sb.Append(tableName);
sb.Append(" WHERE ");
var paramNumber = 0;
const string and = " AND ";
foreach (var condition in conditions)
{
condition.AddToCommand(cmd, sb, cn.DatabaseInfo, InlineUpdate.GetParamNameFromNumber(paramNumber++));
sb.Append(and);
}
sb.Remove(sb.Length - and.Length, and.Length);
cmd.CommandText = sb.ToString();
return(cn.ExecuteNonQueryCommand(cmd));
}
/// <summary>
/// Executes this command using the specified database connection to get a data reader and then executes the specified
/// method with the reader.
/// </summary>
public void Execute(DBConnection cn, Action <DbDataReader> readerMethod)
{
// NOTE SJR: Say a single insert statement gets executed 1000 times. This will generate the same
// duplicate string in memory 1000 times. But, we wouldn't want to intern the strings because
// those strings would never leave the pool and effectively be leaked. I think per maybe, a transaction,
// we should intern strings ourselves. We could either generate the string again, but then dump it if
// it's a duplicate (easy), or use the inputs to determine if WOULD generate the same string, and instead
// pull the one already-generated out of the cache (hard).
var command = cn.DatabaseInfo.CreateCommand(timeout);
var sb = new StringBuilder("SELECT");
if (cacheQueryInDatabase && cn.DatabaseInfo.QueryCacheHint.Any())
{
sb.Append(" ");
sb.Append(cn.DatabaseInfo.QueryCacheHint);
}
sb.Append(" ");
sb.Append(StringTools.ConcatenateWithDelimiter(", ", selectExpressions));
sb.Append(" ");
sb.Append(fromClause);
if (conditions.Any())
{
sb.Append(" WHERE ");
var first = true;
var paramNumber = 0;
foreach (var condition in conditions)
{
if (!first)
{
sb.Append(" AND ");
}
first = false;
condition.AddToCommand(command, sb, cn.DatabaseInfo, InlineUpdate.GetParamNameFromNumber(paramNumber++));
}
}
if (orderByClause != "")
{
sb.Append(" ");
sb.Append(orderByClause);
}
command.CommandText = sb.ToString();
cn.ExecuteReaderCommand(command, readerMethod);
}
