/// <summary>
/// The JetSetColumn function modifies a single column value in a modified record to be inserted or to
/// update the current record. It can overwrite an existing value, add a new value to a sequence of
/// values in a multi-valued column, remove a value from a sequence of values in a multi-valued column,
/// or update all or part of a long value (a column of type <see cref="JET_coltyp.LongText"/>
/// or <see cref="JET_coltyp.LongBinary"/>).
/// </summary>
/// <remarks>
/// This is an internal-only version of the API that takes a data buffer and an offset into the buffer.
/// </remarks>
/// <param name="sesid">The session which is performing the update.</param>
/// <param name="tableid">The cursor to update. An update should be prepared.</param>
/// <param name="columnid">The columnid to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="dataSize">The size of data to set.</param>
/// <param name="dataOffset">The offset in the data buffer to set data from.</param>
/// <param name="grbit">SetColumn options.</param>
/// <param name="setinfo">Used to specify itag or long-value offset.</param>
/// <returns>A warning value.</returns>
public static JET_wrn JetSetColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, byte[] data, int dataSize, int dataOffset, SetColumnGrbit grbit, JET_SETINFO setinfo)
{
if (dataOffset < 0
|| (null != data && 0 != dataSize && dataOffset >= data.Length)
|| (null == data && dataOffset != 0))
{
throw new ArgumentOutOfRangeException(
"dataOffset",
dataOffset,
"must be inside the data buffer");
}
if (null != data && dataSize > checked(data.Length - dataOffset) && (SetColumnGrbit.SizeLV != (grbit & SetColumnGrbit.SizeLV)))
{
throw new ArgumentOutOfRangeException(
"dataSize",
dataSize,
"cannot be greater than the length of the data (unless the SizeLV option is used)");
}
unsafe
{
fixed (byte* pointer = data)
{
return Api.JetSetColumn(sesid, tableid, columnid, new IntPtr(pointer + dataOffset), dataSize, grbit, setinfo);
}
}
}
public void ConvertSetinfoToNative()
{
var setinfo = new JET_SETINFO { ibLongValue = 1, itagSequence = 2 };
NATIVE_SETINFO native = setinfo.GetNativeSetinfo();
Assert.AreEqual(1U, native.ibLongValue);
Assert.AreEqual(2U, native.itagSequence);
}
/// <summary>
/// Sets the length of the stream.
/// </summary>
/// <param name="value">The desired length, in bytes.</param>
public override void SetLength(long value)
{
if (value > MaxLongValueSize || value < 0)
{
throw new ArgumentOutOfRangeException("value", value, "A LongValueStream cannot be longer than 0x7FFFFFF or less than 0 bytes");
}
if (value < this.Length && value > 0)
{
// BUG: Shrinking the column multiple times and then growing it can sometimes hit an unpleasant
// ESENT defect which causes a hang. To make sure we never have that problem we read out the data,
// and insert into a new long-value. This is not efficient.
var data = new byte[value];
var retinfo = new JET_RETINFO {
itagSequence = this.Itag, ibLongValue = 0
};
int actualDataSize;
Api.JetRetrieveColumn(
this.sesid,
this.tableid,
this.columnid,
data,
data.Length,
out actualDataSize,
RetrieveGrbit,
retinfo);
var setinfo = new JET_SETINFO {
itagSequence = this.Itag
};
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, data, data.Length, SetColumnGrbit.None, setinfo);
}
else
{
var setinfo = new JET_SETINFO {
itagSequence = this.Itag
};
SetColumnGrbit grbit = (0 == value) ? SetColumnGrbit.ZeroLength : SetColumnGrbit.SizeLV;
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, null, checked ((int)value), grbit, setinfo);
}
// Setting the length moves the offset back to the end of the data
if (this.ibLongValue > value)
{
this.ibLongValue = checked ((int)value);
}
}
/// <summary>
/// Writes a sequence of bytes to the current stream and advances the current
/// position within this stream by the number of bytes written.
/// </summary>
/// <param name="buffer">The buffer to write from.</param>
/// <param name="offset">The offset in the buffer to write.</param>
/// <param name="count">The number of bytes to write.</param>
public override void Write(byte[] buffer, int offset, int count)
{
CheckBufferArguments(buffer, offset, count);
int length = checked ((int)this.Length);
JET_SETINFO setinfo;
int newIbLongValue = checked (this.ibLongValue + count);
// If our current position is beyond the end of the LV extend
// the LV to the write point
if (this.ibLongValue > length)
{
setinfo = new JET_SETINFO {
itagSequence = this.Itag
};
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, null, this.ibLongValue, SetColumnGrbit.SizeLV, setinfo);
length = this.ibLongValue;
}
SetColumnGrbit grbit;
if (this.ibLongValue == length)
{
grbit = SetColumnGrbit.AppendLV;
}
else if (newIbLongValue >= length)
{
grbit = SetColumnGrbit.OverwriteLV | SetColumnGrbit.SizeLV;
}
else
{
grbit = SetColumnGrbit.OverwriteLV;
}
setinfo = new JET_SETINFO {
itagSequence = this.Itag, ibLongValue = this.ibLongValue
};
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, buffer, count, offset, grbit, setinfo);
checked
{
this.ibLongValue += count;
}
}
/// <summary>
/// Writes a sequence of bytes to the current stream and advances the current
/// position within this stream by the number of bytes written.
/// </summary>
/// <param name="buffer">The buffer to write from.</param>
/// <param name="offset">The offset in the buffer to write.</param>
/// <param name="count">The number of bytes to write.</param>
public override void Write(byte[] buffer, int offset, int count)
{
CheckBufferArguments(buffer, offset, count);
int length = checked((int)this.Length);
JET_SETINFO setinfo;
int newIbLongValue = checked(this.ibLongValue + count);
// If our current position is beyond the end of the LV extend
// the LV to the write point
if (this.ibLongValue > length)
{
setinfo = new JET_SETINFO { itagSequence = this.Itag };
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, null, this.ibLongValue, SetColumnGrbit.SizeLV, setinfo);
length = this.ibLongValue;
}
SetColumnGrbit grbit;
if (this.ibLongValue == length)
{
grbit = SetColumnGrbit.AppendLV;
}
else if (newIbLongValue >= length)
{
grbit = SetColumnGrbit.OverwriteLV | SetColumnGrbit.SizeLV;
}
else
{
grbit = SetColumnGrbit.OverwriteLV;
}
setinfo = new JET_SETINFO { itagSequence = this.Itag, ibLongValue = this.ibLongValue };
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, buffer, count, offset, grbit, setinfo);
checked
{
this.ibLongValue += count;
}
}
/// <summary>
/// Updates a record setting the given column set to the specified value.
/// </summary>
/// <param name="columnid">The column to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="itagSequence">The itag sequence to set.</param>
private void SetColumn(JET_COLUMNID columnid, byte[] data, int itagSequence)
{
var setinfo = new JET_SETINFO
{
ibLongValue = 0,
itagSequence = itagSequence,
};
Api.JetSetColumn(this.sesid, this.tableid, columnid, data, (null == data) ? 0 : data.Length, SetColumnGrbit.None, setinfo);
}
public void HowDoIDealWithMultivalues()
{
JET_SESID sesid = this.testSession;
JET_DBID dbid = this.testDbid;
JET_TABLEID tableid;
JET_COLUMNDEF columndef = new JET_COLUMNDEF();
JET_COLUMNID tagColumn;
Api.JetCreateTable(sesid, dbid, "table", 0, 100, out tableid);
// Create the column. Any column can be multivalued. Using
// ColumndefGrbit controls how the column is indexed.
columndef.coltyp = JET_coltyp.LongText;
columndef.cp = JET_CP.Unicode;
columndef.grbit = ColumndefGrbit.ColumnMultiValued;
Api.JetAddColumn(sesid, tableid, "tags", columndef, null, 0, out tagColumn);
// Create the index. There will be one entry in the index for each
// instance of the multivalued column.
const string IndexKey = "+tags\0\0";
Api.JetCreateIndex(sesid, tableid, "tagsindex", CreateIndexGrbit.None, IndexKey, IndexKey.Length, 100);
Api.JetBeginTransaction(sesid);
// Now insert a record. An ESENT column can have multiple instances (multivalues)
// inside the same record. Each multivalue is identified by an itag, the first itag
// in a sequence is 1.
Api.JetPrepareUpdate(sesid, tableid, JET_prep.Insert);
// With no JET_SETINFO specified, itag 1 will be set.
byte[] data = Encoding.Unicode.GetBytes("foo");
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.None, null);
// Set a column with a setinfo. The itagSequence in the setinfo will be 0, which
// means the value will be added to the collection of values, i.e. the column will
// have two instances, "foo" and "bar".
JET_SETINFO setinfo = new JET_SETINFO();
data = Encoding.Unicode.GetBytes("bar");
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.None, setinfo);
// Add a third instance, explicitly setting the itagSequence
data = Encoding.Unicode.GetBytes("baz");
setinfo.itagSequence = 4;
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.None, setinfo);
// Add a duplicate value, checking for uniqueness
data = Encoding.Unicode.GetBytes("foo");
setinfo.itagSequence = 0;
try
{
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.UniqueMultiValues, setinfo);
Assert.Fail("Expected an EsentErrorException");
}
catch (EsentErrorException ex)
{
Assert.AreEqual(JET_err.MultiValuedDuplicate, ex.Error);
}
Api.JetUpdate(sesid, tableid);
// Find the record. We can seek for any column instance.
Api.JetSetCurrentIndex(sesid, tableid, "tagsindex");
Api.MakeKey(sesid, tableid, "bar", Encoding.Unicode, MakeKeyGrbit.NewKey);
Assert.IsTrue(Api.TrySeek(sesid, tableid, SeekGrbit.SeekEQ));
// Retrieve the number of column instances. This can be done with JetRetrieveColumns by setting
// itagSequence to 0.
JET_RETRIEVECOLUMN retrievecolumn = new JET_RETRIEVECOLUMN();
retrievecolumn.columnid = tagColumn;
retrievecolumn.itagSequence = 0;
Api.JetRetrieveColumns(sesid, tableid, new[] { retrievecolumn }, 1);
Console.WriteLine("{0}", retrievecolumn.itagSequence);
Assert.AreEqual(3, retrievecolumn.itagSequence);
// Retrieve all the columns
for (int itag = 1; itag <= retrievecolumn.itagSequence; ++itag)
{
JET_RETINFO retinfo = new JET_RETINFO { itagSequence = itag };
string s = Encoding.Unicode.GetString(Api.RetrieveColumn(sesid, tableid, tagColumn, RetrieveColumnGrbit.None, retinfo));
Console.WriteLine("{0}: {1}", itag, s);
}
// Update the record
Api.JetPrepareUpdate(sesid, tableid, JET_prep.Replace);
// With no JET_SETINFO specified, itag 1 will be set, overwriting the existing value.
data = Encoding.Unicode.GetBytes("qux");
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.None, null);
// Set an instance to null to delete it.
setinfo.itagSequence = 2;
Api.JetSetColumn(sesid, tableid, tagColumn, null, 0, SetColumnGrbit.None, setinfo);
// Removing itag 2 moved the other itags down (i.e. itag 3 became itag 2).
// Overwrite itag 2.
data = Encoding.Unicode.GetBytes("xyzzy");
setinfo.itagSequence = 2;
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.None, setinfo);
// Now add a new instance by setting itag 0. This instance will go at the end.
data = Encoding.Unicode.GetBytes("flob");
setinfo.itagSequence = 0;
Api.JetSetColumn(sesid, tableid, tagColumn, data, data.Length, SetColumnGrbit.None, setinfo);
Api.JetUpdate(sesid, tableid);
// Retrieve the number of column instances again.
retrievecolumn.itagSequence = 0;
Api.JetRetrieveColumns(sesid, tableid, new[] { retrievecolumn }, 1);
// Retrieve all the columns
for (int itag = 1; itag <= retrievecolumn.itagSequence; ++itag)
{
JET_RETINFO retinfo = new JET_RETINFO { itagSequence = itag };
string s = Encoding.Unicode.GetString(Api.RetrieveColumn(sesid, tableid, tagColumn, RetrieveColumnGrbit.None, retinfo));
Console.WriteLine("{0}: {1}", itag, s);
}
Api.JetCommitTransaction(sesid, CommitTransactionGrbit.LazyFlush);
}
/// <summary>
/// Updates a record setting the given column set to the specified value.
/// </summary>
/// <param name="columnid">The column to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="itagSequence">The itag sequence to set.</param>
private void SetColumn(JET_COLUMNID columnid, byte[] data, int itagSequence)
{
Api.JetBeginTransaction(this.sesid);
Api.JetPrepareUpdate(this.sesid, this.tableid, JET_prep.Replace);
var setinfo = new JET_SETINFO
{
ibLongValue = 0,
itagSequence = itagSequence,
};
Api.JetSetColumn(this.sesid, this.tableid, columnid, data, (null == data) ? 0 : data.Length, SetColumnGrbit.None, setinfo);
Api.JetUpdate(this.sesid, this.tableid);
Api.JetCommitTransaction(this.sesid, CommitTransactionGrbit.LazyFlush);
}
public void ConvertSetinfoToNativeWhenItagSequenceIsNegative()
{
var setinfo = new JET_SETINFO { ibLongValue = 0, itagSequence = Int32.MinValue };
NATIVE_SETINFO native = setinfo.GetNativeSetinfo();
}
/// <summary>
/// The JetSetColumn function modifies a single column value in a modified record to be inserted or to
/// update the current record. It can overwrite an existing value, add a new value to a sequence of
/// values in a multi-valued column, remove a value from a sequence of values in a multi-valued column,
/// or update all or part of a long value, a column of type JET_coltyp.LongText or JET_coltyp.LongBinary.
/// </summary>
/// <remarks>
/// This method takes an IntPtr and is intended for internal use only.
/// </remarks>
/// <param name="sesid">The session which is performing the update.</param>
/// <param name="tableid">The cursor to update. An update should be prepared.</param>
/// <param name="columnid">The columnid to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="dataSize">The size of data to set.</param>
/// <param name="grbit">SetColumn options.</param>
/// <param name="setinfo">Used to specify itag or long-value offset.</param>
/// <returns>A warning value.</returns>
internal static JET_wrn JetSetColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, IntPtr data, int dataSize, SetColumnGrbit grbit, JET_SETINFO setinfo)
{
return Api.Check(Impl.JetSetColumn(sesid, tableid, columnid, data, dataSize, grbit, setinfo));
}
/// <summary>
/// The JetSetColumn function modifies a single column value in a modified record to be inserted or to
/// update the current record. It can overwrite an existing value, add a new value to a sequence of
/// values in a multi-valued column, remove a value from a sequence of values in a multi-valued column,
/// or update all or part of a long value (a column of type <see cref="JET_coltyp.LongText"/>
/// or <see cref="JET_coltyp.LongBinary"/>).
/// </summary>
/// <remarks>
/// The SetColumn methods provide datatype-specific overrides which may be more efficient.
/// </remarks>
/// <param name="sesid">The session which is performing the update.</param>
/// <param name="tableid">The cursor to update. An update should be prepared.</param>
/// <param name="columnid">The columnid to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="dataSize">The size of data to set.</param>
/// <param name="grbit">SetColumn options.</param>
/// <param name="setinfo">Used to specify itag or long-value offset.</param>
/// <returns>A warning code.</returns>
public static JET_wrn JetSetColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, byte[] data, int dataSize, SetColumnGrbit grbit, JET_SETINFO setinfo)
{
return Api.JetSetColumn(sesid, tableid, columnid, data, dataSize, 0, grbit, setinfo);
}
// insert a record and update its long-values
private void UpdateLongValues()
{
Console.WriteLine("\tUpdate Long-Values");
JET_TABLEID tableid;
Api.JetOpenTable(this.sesid, this.dbid, this.table, null, 0, OpenTableGrbit.None, out tableid);
int recordID = NumRecords + 17;
var rand = new Random(recordID);
var data = new byte[this.columnInfos.Length][];
Api.JetBeginTransaction(this.sesid);
// insert the record
using (var update = new Update(this.sesid, tableid, JET_prep.Insert))
{
for (int i = 0; i < this.columnInfos.Length; ++i)
{
data[i] = null;
if (String.Equals(
this.columnInfos[i].Name, "recordID", StringComparison.InvariantCultureIgnoreCase))
{
// this is the primary index column, set it to the recordID
data[i] = BitConverter.GetBytes(recordID);
}
else if (this.columnInfos[i].Coltyp == JET_coltyp.LongBinary
|| this.columnInfos[i].Coltyp == JET_coltyp.LongText)
{
data[i] = DataGenerator.GetRandomColumnData(
this.columnInfos[i].Coltyp, this.columnInfos[i].Cp, rand);
}
if (null != data[i])
{
Api.SetColumn(this.sesid, tableid, this.columnInfos[i].Columnid, data[i]);
}
}
update.SaveAndGotoBookmark();
}
this.CheckColumns(this.sesid, tableid, data);
// update the record
using (var update = new Update(this.sesid, tableid, JET_prep.Replace))
{
for (int i = 0; i < this.columnInfos.Length; ++i)
{
if (this.columnInfos[i].Coltyp == JET_coltyp.LongBinary
|| this.columnInfos[i].Coltyp == JET_coltyp.LongText)
{
int size = Api.RetrieveColumnSize(this.sesid, tableid, this.columnInfos[i].Columnid).Value;
BasicClass.Assert(size == data[i].Length, "Invalid column size");
var setinfo = new JET_SETINFO();
setinfo.ibLongValue = size / 2;
setinfo.itagSequence = 1;
// the data that will be added to the column
byte[] newdata = DataGenerator.GetRandomColumnData(
this.columnInfos[i].Coltyp, this.columnInfos[i].Cp, rand);
// what the final data should be
byte[] finaldata = null;
switch (rand.Next(2))
{
case 0: // append
Api.SetColumn(
this.sesid, tableid, this.columnInfos[i].Columnid, newdata, SetColumnGrbit.AppendLV);
finaldata = new byte[size + newdata.Length];
Array.Copy(data[i], finaldata, size);
Array.Copy(newdata, 0, finaldata, size, newdata.Length);
break;
case 1: // overwrite and set size
Api.JetSetColumn(
this.sesid,
tableid,
this.columnInfos[i].Columnid,
newdata,
newdata.Length,
SetColumnGrbit.SizeLV | SetColumnGrbit.OverwriteLV,
setinfo);
finaldata = new byte[setinfo.ibLongValue + newdata.Length];
Array.Copy(data[i], finaldata, setinfo.ibLongValue);
Array.Copy(newdata, 0, finaldata, setinfo.ibLongValue, newdata.Length);
break;
}
data[i] = finaldata;
}
}
update.SaveAndGotoBookmark();
}
this.CheckColumns(this.sesid, tableid, data);
Api.JetCommitTransaction(this.sesid, CommitTransactionGrbit.LazyFlush);
Api.JetCloseTable(this.sesid, tableid);
}
public void JetSetColumnThrowsExceptionWhenIbLongValueIsNegative()
{
var setinfo = new JET_SETINFO { ibLongValue = -1 };
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, null, 0, SetColumnGrbit.None, setinfo);
}
public void JetSetinfoToString()
{
var value = new JET_SETINFO { ibLongValue = 1, itagSequence = 2 };
Assert.AreEqual("JET_SETINFO(ibLongValue=1,itagSequence=2)", value.ToString());
}
/// <summary>
/// Sets the length of the stream.
/// </summary>
/// <param name="value">The desired length, in bytes.</param>
public override void SetLength(long value)
{
if (value > MaxLongValueSize || value < 0)
{
throw new ArgumentOutOfRangeException("value", value, "A LongValueStream cannot be longer than 0x7FFFFFF or less than 0 bytes");
}
if (value < this.Length && value > 0)
{
// BUG: Shrinking the column multiple times and then growing it can sometimes hit an unpleasant
// ESENT defect which causes a hang. To make sure we never have that problem we read out the data,
// and insert into a new long-value. This is not efficient.
var data = new byte[value];
var retinfo = new JET_RETINFO { itagSequence = this.Itag, ibLongValue = 0 };
int actualDataSize;
Api.JetRetrieveColumn(
this.sesid,
this.tableid,
this.columnid,
data,
data.Length,
out actualDataSize,
RetrieveGrbit,
retinfo);
var setinfo = new JET_SETINFO { itagSequence = this.Itag };
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, data, data.Length, SetColumnGrbit.None, setinfo);
}
else
{
var setinfo = new JET_SETINFO { itagSequence = this.Itag };
SetColumnGrbit grbit = (0 == value) ? SetColumnGrbit.ZeroLength : SetColumnGrbit.SizeLV;
Api.JetSetColumn(this.sesid, this.tableid, this.columnid, null, checked((int)value), grbit, setinfo);
}
// Setting the length moves the offset back to the end of the data
if (this.ibLongValue > value)
{
this.ibLongValue = checked((int)value);
}
}
/// <summary>
/// The JetSetColumn function modifies a single column value in a modified record to be inserted or to
/// update the current record. It can overwrite an existing value, add a new value to a sequence of
/// values in a multi-valued column, remove a value from a sequence of values in a multi-valued column,
/// or update all or part of a long value, a column of type JET_coltyp.LongText or JET_coltyp.LongBinary.
/// </summary>
/// <remarks>
/// This method takes an IntPtr and is intended for internal use only.
/// </remarks>
/// <param name="sesid">The session which is performing the update.</param>
/// <param name="tableid">The cursor to update. An update should be prepared.</param>
/// <param name="columnid">The columnid to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="dataSize">The size of data to set.</param>
/// <param name="grbit">SetColumn options.</param>
/// <param name="setinfo">Used to specify itag or long-value offset.</param>
/// <returns>A warning value.</returns>
internal static JET_wrn JetSetColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, IntPtr data, int dataSize, SetColumnGrbit grbit, JET_SETINFO setinfo)
{
return(Api.Check(Impl.JetSetColumn(sesid, tableid, columnid, data, dataSize, grbit, setinfo)));
}
/// <summary>
/// The JetSetColumn function modifies a single column value in a modified record to be inserted or to
/// update the current record. It can overwrite an existing value, add a new value to a sequence of
/// values in a multi-valued column, remove a value from a sequence of values in a multi-valued column,
/// or update all or part of a long value (a column of type <see cref="JET_coltyp.LongText"/>
/// or <see cref="JET_coltyp.LongBinary"/>).
/// </summary>
/// <remarks>
/// This is an internal-only version of the API that takes a data buffer and an offset into the buffer.
/// </remarks>
/// <param name="sesid">The session which is performing the update.</param>
/// <param name="tableid">The cursor to update. An update should be prepared.</param>
/// <param name="columnid">The columnid to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="dataSize">The size of data to set.</param>
/// <param name="dataOffset">The offset in the data buffer to set data from.</param>
/// <param name="grbit">SetColumn options.</param>
/// <param name="setinfo">Used to specify itag or long-value offset.</param>
/// <returns>A warning value.</returns>
public static JET_wrn JetSetColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, byte[] data, int dataSize, int dataOffset, SetColumnGrbit grbit, JET_SETINFO setinfo)
{
if (dataOffset < 0 ||
(null != data && 0 != dataSize && dataOffset >= data.Length) ||
(null == data && dataOffset != 0))
{
throw new ArgumentOutOfRangeException(
"dataOffset",
dataOffset,
"must be inside the data buffer");
}
if (null != data && dataSize > checked (data.Length - dataOffset) && (SetColumnGrbit.SizeLV != (grbit & SetColumnGrbit.SizeLV)))
{
throw new ArgumentOutOfRangeException(
"dataSize",
dataSize,
"cannot be greater than the length of the data (unless the SizeLV option is used)");
}
unsafe
{
fixed(byte *pointer = data)
{
return(Api.JetSetColumn(sesid, tableid, columnid, new IntPtr(pointer + dataOffset), dataSize, grbit, setinfo));
}
}
}
/// <summary>
/// Insert a record with the given column values. After the insert the cursor is
/// positioned on the record.
/// </summary>
/// <param name="key">
/// The key of the record.
/// </param>
/// <param name="values">
/// The column values to insert.
/// </param>
private void InsertRecord(int key, params string[] values)
{
using (var transaction = new Transaction(this.sesid))
using (var update = new Update(this.sesid, this.tableid, JET_prep.Insert))
{
Api.SetColumn(this.sesid, this.tableid, this.keyColumn, key);
foreach (string value in values)
{
var setinfo = new JET_SETINFO
{
ibLongValue = 0,
itagSequence = 0,
};
byte[] data = Encoding.Unicode.GetBytes(value);
Api.JetSetColumn(
this.sesid, this.tableid, this.multiValueColumn, data, data.Length, SetColumnGrbit.None, setinfo);
}
update.SaveAndGotoBookmark();
transaction.Commit(CommitTransactionGrbit.None);
}
}
/// <summary>
/// Sets the column.
/// </summary>
/// <param name="columnid">The columnid.</param>
/// <param name="coltyp">The coltyp.</param>
/// <param name="isAscii">Whether a textual column is Ascii.</param>
/// <param name="index">The index.</param>
/// <param name="obj">The object.</param>
/// <exception cref="System.InvalidOperationException">You may only update fields through Cursor.EditRecord.</exception>
/// <remarks>
/// Itags start at 1, so we add 1 to the index
/// </remarks>
private void SetColumn(JET_COLUMNID columnid, JET_coltyp coltyp, bool isAscii, int index, object obj)
{
lock (this.isamSession)
{
this.cursor.CheckDisposed();
if ((this.grbit & RetrieveColumnGrbit.RetrieveCopy) == 0)
{
this.cursor.CheckRecord();
throw new InvalidOperationException("You may only update fields through Cursor.EditRecord.");
}
// if this is a Sort or PreSortTemporary TT and we are setting
// an LV column then always attempt to use intrinsic LVs
SetColumnGrbit grbitSet = SetColumnGrbit.None;
if ((this.cursor.TableDefinition.Type == TableType.Sort
|| this.cursor.TableDefinition.Type == TableType.PreSortTemporary)
&& (coltyp == JET_coltyp.LongText || coltyp == JET_coltyp.LongBinary))
{
grbitSet = grbitSet | SetColumnGrbit.IntrinsicLV;
}
JET_SETINFO setinfo = new JET_SETINFO();
setinfo.ibLongValue = 0;
setinfo.itagSequence = index + 1;
byte[] bytes = Converter.BytesFromObject(coltyp, isAscii, obj);
int bytesLength = bytes == null ? 0 : bytes.Length;
Api.JetSetColumn(this.isamSession.Sesid, this.tableid, columnid, bytes, bytesLength, grbitSet, setinfo);
this.updateID++;
}
}
