/// <summary>
/// Drop index and release slot for another index
/// </summary>
public bool DropIndex(string field)
{
if (string.IsNullOrEmpty(field))
{
throw new ArgumentNullException("field");
}
if (field == "_id")
{
throw LiteException.IndexDropId();
}
// start transaction
this.Database.Transaction.Begin();
try
{
var col = this.GetCollectionPage(false);
// if collection not exists, no drop
if (col == null)
{
this.Database.Transaction.Abort();
return(false);
}
// search for index reference
var index = col.GetIndex(field);
if (index == null)
{
this.Database.Transaction.Abort();
return(false);
}
// delete all data pages + indexes pages
this.Database.Indexer.DropIndex(index);
// clear index reference
index.Clear();
// save collection page
col.IsDirty = true;
this.Database.Transaction.Commit();
return(true);
}
catch
{
this.Database.Transaction.Rollback();
throw;
}
}
/// <summary>
/// Drop an index from a collection
/// </summary>
public bool DropIndex(string collection, string field)
{
if (collection.IsNullOrWhiteSpace())
{
throw new ArgumentNullException("collection");
}
if (field.IsNullOrWhiteSpace())
{
throw new ArgumentNullException("field");
}
if (field == "_id")
{
throw LiteException.IndexDropId();
}
return(this.Transaction <bool>(collection, false, (col) =>
{
// no collection, no index
if (col == null)
{
return false;
}
// search for index reference
var index = col.GetIndex(field);
// no index, no drop
if (index == null)
{
return false;
}
_log.Write(LoggerWrap.COMMAND, "drop index on '{0}' :: '{1}'", collection, field);
// delete all data pages + indexes pages
_indexer.DropIndex(index);
// clear index reference
index.Clear();
// mark collection page as dirty
_pager.SetDirty(col);
return true;
}));
}
/// <summary>
/// Drop an index from a collection
/// </summary>
public bool DropIndex(string colName, string field)
{
if (field == "_id")
{
throw LiteException.IndexDropId();
}
return(Transaction(colName, false, col =>
{
// no collection, no index
if (col == null)
{
return false;
}
// mark collection page as dirty before changes
_pager.SetDirty(col);
// search for index reference
var index = col.GetIndex(field);
// no index, no drop
if (index == null)
{
return false;
}
_log.Write(Logger.COMMAND, "drop index on '{0}' :: '{1}'", colName, field);
// delete all data pages + indexes pages
_indexer.DropIndex(index);
// clear index reference
index.Clear();
return true;
}));
}
