/// <summary>
/// Reads a column
/// </summary>
/// <param name="table">The table</param>
/// <param name="rid">Row ID</param>
/// <param name="column">Column</param>
/// <param name="value">Result is put here or 0 if we return <c>false</c></param>
/// <returns><c>true</c> if we could read the column, <c>false</c> otherwise</returns>
public bool ReadColumn(MDTable table, uint rid, ColumnInfo column, out uint value)
{
if (table == null || table.IsInvalidRID(rid))
{
value = 0;
return(false);
}
var cr = columnReader;
if (cr != null && cr.ReadColumn(table, rid, column, out value))
{
return(true);
}
#if THREAD_SAFE
theLock.EnterWriteLock(); try {
#endif
var reader = GetReader_NoLock(table, rid);
reader.Position += column.Offset;
value = column.Read(reader);
#if THREAD_SAFE
}
finally { theLock.ExitWriteLock(); }
#endif
return(true);
}
/// <summary>
/// Reads a column
/// </summary>
/// <param name="table">The table</param>
/// <param name="rid">Row ID</param>
/// <param name="column">Column</param>
/// <param name="value">Result is put here or 0 if we return <c>false</c></param>
/// <returns><c>true</c> if we could read the column, <c>false</c> otherwise</returns>
public bool TryReadColumn(MDTable table, uint rid, ColumnInfo column, out uint value)
{
if (table.IsInvalidRID(rid))
{
value = 0;
return(false);
}
var cr = columnReader;
if (cr != null && cr.ReadColumn(table, rid, column, out value))
{
return(true);
}
var reader = table.DataReader;
reader.Position = (rid - 1) * (uint)table.TableInfo.RowSize + (uint)column.Offset;
value = column.Read(ref reader);
return(true);
}
/// <summary>
/// Reads a column
/// </summary>
/// <param name="table">The table</param>
/// <param name="rid">Row ID</param>
/// <param name="column">Column</param>
/// <param name="value">Result is put here or 0 if we return <c>false</c></param>
/// <returns><c>true</c> if we could read the column, <c>false</c> otherwise</returns>
internal bool ReadColumn_NoLock(MDTable table, uint rid, ColumnInfo column, out uint value) {
if (table.IsInvalidRID(rid)) {
value = 0;
return false;
}
var cr = columnReader;
if (cr != null && cr.ReadColumn(table, rid, column, out value))
return true;
var reader = GetReader_NoLock(table, rid);
reader.Position += column.Offset;
value = column.Read(reader);
return true;
}
/// <summary>
/// Reads a column
/// </summary>
/// <param name="table">The table</param>
/// <param name="rid">Row ID</param>
/// <param name="column">Column</param>
/// <param name="value">Result is put here or 0 if we return <c>false</c></param>
/// <returns><c>true</c> if we could read the column, <c>false</c> otherwise</returns>
public bool ReadColumn(MDTable table, uint rid, ColumnInfo column, out uint value) {
if (table.IsInvalidRID(rid)) {
value = 0;
return false;
}
var cr = columnReader;
if (cr != null && cr.ReadColumn(table, rid, column, out value))
return true;
#if THREAD_SAFE
theLock.EnterWriteLock(); try {
#endif
var reader = GetReader_NoLock(table, rid);
reader.Position += column.Offset;
value = column.Read(reader);
#if THREAD_SAFE
} finally { theLock.ExitWriteLock(); }
#endif
return true;
}