| public static JetMakeKey ( JET_SESID sesid, JET_TABLEID tableid, byte data, int dataSize, MakeKeyGrbit grbit ) : void | ||
| sesid | JET_SESID | The session to use. |
| tableid | JET_TABLEID | The cursor to create the key on. |
| data | byte | Column data for the current key column of the current index. |
| dataSize | int | Size of the data. |
| grbit | MakeKeyGrbit | Key options. |
| return | void | |
/// <summary>
/// Constructs a search key that may then be used by <see cref="JetSeek"/>
/// and <see cref="JetSetIndexRange"/>.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The cursor to create the key on.</param>
/// <param name="data">Column data for the current key column of the current index.</param>
/// <param name="encoding">The encoding used to convert the string.</param>
/// <param name="grbit">Key options.</param>
public static void MakeKey(JET_SESID sesid, JET_TABLEID tableid, string data, Encoding encoding, MakeKeyGrbit grbit)
{
CheckEncodingIsValid(encoding);
if (null == data)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit);
}
else if (0 == data.Length)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit | MakeKeyGrbit.KeyDataZeroLength);
}
else if (Encoding.Unicode == encoding)
{
// Optimization for Unicode strings
unsafe
{
fixed(char *buffer = data)
{
Api.JetMakeKey(sesid, tableid, new IntPtr(buffer), checked (data.Length * sizeof(char)), grbit);
}
}
}
else
{
byte[] bytes = encoding.GetBytes(data);
Api.JetMakeKey(sesid, tableid, bytes, bytes.Length, grbit);
}
}
/// <summary>
/// Constructs a search key that may then be used by <see cref="JetSeek"/>
/// and <see cref="JetSetIndexRange"/>.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The cursor to create the key on.</param>
/// <param name="data">Column data for the current key column of the current index.</param>
/// <param name="encoding">The encoding used to convert the string.</param>
/// <param name="grbit">Key options.</param>
public static void MakeKey(JET_SESID sesid, JET_TABLEID tableid, string data, Encoding encoding, MakeKeyGrbit grbit)
{
CheckEncodingIsValid(encoding);
if (null == data)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit);
}
else if (0 == data.Length)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit | MakeKeyGrbit.KeyDataZeroLength);
}
else if (Encoding.Unicode == encoding)
{
// Optimization for Unicode strings
unsafe
{
fixed(char *buffer = data)
{
Api.JetMakeKey(sesid, tableid, new IntPtr(buffer), checked (data.Length * sizeof(char)), grbit);
}
}
}
else
{
#if MANAGEDESENT_ON_WSA
// Encoding.GetBytes(char*, int, byte*, int) overload is missing in new Windows UI.
// So we can't use the ColumnCache. We'll just use a different GetBytes() overload.
byte[] buffer = encoding.GetBytes(data);
Api.JetMakeKey(sesid, tableid, buffer, buffer.Length, grbit);
#else
// Convert the string using a cached column buffer. The column buffer is far larger
// than the maximum key size, so any data truncation here won't matter.
byte[] buffer = null;
try
{
buffer = Caches.ColumnCache.Allocate();
int dataSize;
unsafe
{
fixed(char *chars = data)
fixed(byte *bytes = buffer)
{
dataSize = encoding.GetBytes(chars, data.Length, bytes, buffer.Length);
}
}
JetMakeKey(sesid, tableid, buffer, dataSize, grbit);
}
finally
{
if (buffer != null)
{
Caches.ColumnCache.Free(ref buffer);
}
}
#endif
}
}
public static void MakeKey(JET_SESID sesid, JET_TABLEID tableid, ulong data, MakeKeyGrbit grbit)
{
unsafe
{
const int DataSize = sizeof(ulong);
var pointer = new IntPtr(&data);
Api.JetMakeKey(sesid, tableid, pointer, DataSize, grbit);
}
}
/// <summary>
/// Constructs a search key that may then be used by <see cref="JetSeek"/>
/// and <see cref="JetSetIndexRange"/>.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The cursor to create the key on.</param>
/// <param name="data">Column data for the current key column of the current index.</param>
/// <param name="grbit">Key options.</param>
public static void MakeKey(JET_SESID sesid, JET_TABLEID tableid, byte[] data, MakeKeyGrbit grbit)
{
if (null == data)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit);
}
else if (0 == data.Length)
{
Api.JetMakeKey(sesid, tableid, data, data.Length, grbit | MakeKeyGrbit.KeyDataZeroLength);
}
else
{
Api.JetMakeKey(sesid, tableid, data, data.Length, grbit);
}
}
/// <summary>
/// Constructs a search key that may then be used by <see cref="JetSeek"/>
/// and <see cref="JetSetIndexRange"/>.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The cursor to create the key on.</param>
/// <param name="data">Column data for the current key column of the current index.</param>
/// <param name="encoding">The encoding used to convert the string.</param>
/// <param name="grbit">Key options.</param>
public static void MakeKey(JET_SESID sesid, JET_TABLEID tableid, string data, Encoding encoding, MakeKeyGrbit grbit)
{
CheckEncodingIsValid(encoding);
if (null == data)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit);
}
else if (0 == data.Length)
{
Api.JetMakeKey(sesid, tableid, null, 0, grbit | MakeKeyGrbit.KeyDataZeroLength);
}
else if (Encoding.Unicode == encoding)
{
// Optimization for Unicode strings
unsafe
{
fixed(char *buffer = data)
{
Api.JetMakeKey(sesid, tableid, new IntPtr(buffer), checked (data.Length * sizeof(char)), grbit);
}
}
}
else
{
// Convert the string using a cached column buffer. The column buffer is far larger
// than the maximum key size, so any data truncation here won't matter.
byte[] buffer = Caches.ColumnCache.Allocate();
int dataSize;
unsafe
{
fixed(char *chars = data)
fixed(byte *bytes = buffer)
{
dataSize = encoding.GetBytes(chars, data.Length, bytes, buffer.Length);
}
}
JetMakeKey(sesid, tableid, buffer, dataSize, grbit);
Caches.ColumnCache.Free(ref buffer);
}
}
