[d2857c]: System.Data.SQLite / SQLiteParameterCollection.cs  Maximize  Restore  History

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/********************************************************
* ADO.NET 2.0 Data Provider for SQLite Version 3.X
* Written by Robert Simpson (robert@blackcastlesoft.com)
*
* Released to the public domain, use at your own risk!
********************************************************/
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data.Common;
using System.Globalization;
namespace System.Data.SQLite
{
/// <summary>
/// SQLite implementation of DbParameterCollection.
/// </summary>
#if !PLATFORM_COMPACTFRAMEWORK
[Editor(
"Microsoft.VSDesigner.Data.Design.DBParametersEditor, Microsoft.VSDesigner, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
,
"System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
), ListBindable(false)]
#endif
public sealed class SQLiteParameterCollection : DbParameterCollection
{
/// <summary>
/// The underlying command to which this collection belongs
/// </summary>
private readonly SQLiteCommand _command;
/// <summary>
/// The internal array of parameters in this collection
/// </summary>
private readonly List<SQLiteParameter> _parameterList;
/// <summary>
/// Determines whether or not all parameters have been bound to their statement(s)
/// </summary>
private bool _unboundFlag;
/// <summary>
/// Initializes the collection
/// </summary>
/// <param name="cmd">The command to which the collection belongs</param>
internal SQLiteParameterCollection(SQLiteCommand cmd)
{
_command = cmd;
_parameterList = new List<SQLiteParameter>();
_unboundFlag = true;
}
/// <summary>
/// Returns true
/// </summary>
public override bool IsSynchronized
{
get { return true; }
}
/// <summary>
/// Returns false
/// </summary>
public override bool IsFixedSize
{
get { return false; }
}
/// <summary>
/// Returns false
/// </summary>
public override bool IsReadOnly
{
get { return false; }
}
/// <summary>
/// Returns null
/// </summary>
public override object SyncRoot
{
get { return null; }
}
/// <summary>
/// Retrieves an enumerator for the collection
/// </summary>
/// <returns>An enumerator for the underlying array</returns>
public override IEnumerator GetEnumerator()
{
return _parameterList.GetEnumerator();
}
/// <summary>
/// Adds a parameter to the collection
/// </summary>
/// <param name="parameterName">The parameter name</param>
/// <param name="parameterType">The data type</param>
/// <param name="parameterSize">The size of the value</param>
/// <param name="sourceColumn">The source column</param>
/// <returns>A SQLiteParameter object</returns>
public SQLiteParameter Add(string parameterName, DbType parameterType, int parameterSize, string sourceColumn)
{
var param = new SQLiteParameter(parameterName, parameterType, parameterSize, sourceColumn);
Add(param);
return param;
}
/// <summary>
/// Adds a parameter to the collection
/// </summary>
/// <param name="parameterName">The parameter name</param>
/// <param name="parameterType">The data type</param>
/// <param name="parameterSize">The size of the value</param>
/// <returns>A SQLiteParameter object</returns>
public SQLiteParameter Add(string parameterName, DbType parameterType, int parameterSize)
{
var param = new SQLiteParameter(parameterName, parameterType, parameterSize);
Add(param);
return param;
}
/// <summary>
/// Adds a parameter to the collection
/// </summary>
/// <param name="parameterName">The parameter name</param>
/// <param name="parameterType">The data type</param>
/// <returns>A SQLiteParameter object</returns>
public SQLiteParameter Add(string parameterName, DbType parameterType)
{
var param = new SQLiteParameter(parameterName, parameterType);
Add(param);
return param;
}
/// <summary>
/// Adds a parameter to the collection
/// </summary>
/// <param name="parameter">The parameter to add</param>
/// <returns>A zero-based index of where the parameter is located in the array</returns>
public int Add(SQLiteParameter parameter)
{
int n = -1;
if (String.IsNullOrEmpty(parameter.ParameterName) == false)
{
n = IndexOf(parameter.ParameterName);
}
if (n == -1)
{
n = _parameterList.Count;
_parameterList.Add(parameter);
}
SetParameter(n, parameter);
return n;
}
/// <summary>
/// Adds a parameter to the collection
/// </summary>
/// <param name="value">The parameter to add</param>
/// <returns>A zero-based index of where the parameter is located in the array</returns>
#if !PLATFORM_COMPACTFRAMEWORK
[EditorBrowsable(EditorBrowsableState.Never)]
#endif
public override int Add(object value)
{
return Add((SQLiteParameter) value);
}
/// <summary>
/// Adds a named/unnamed parameter and its value to the parameter collection.
/// </summary>
/// <param name="parameterName">Name of the parameter, or null to indicate an unnamed parameter</param>
/// <param name="value">The initial value of the parameter</param>
/// <returns>Returns the SQLiteParameter object created during the call.</returns>
public SQLiteParameter AddWithValue(string parameterName, object value)
{
var param = new SQLiteParameter(parameterName, value);
Add(param);
return param;
}
/// <summary>
/// Adds an array of parameters to the collection
/// </summary>
/// <param name="values">The array of parameters to add</param>
public void AddRange(SQLiteParameter[] values)
{
int x = values.Length;
for (int n = 0; n < x; n++)
Add(values[n]);
}
/// <summary>
/// Adds an array of parameters to the collection
/// </summary>
/// <param name="values">The array of parameters to add</param>
public override void AddRange(Array values)
{
int x = values.Length;
for (int n = 0; n < x; n++)
Add((SQLiteParameter) (values.GetValue(n)));
}
/// <summary>
/// Clears the array and resets the collection
/// </summary>
public override void Clear()
{
_unboundFlag = true;
_parameterList.Clear();
}
/// <summary>
/// Determines if the named parameter exists in the collection
/// </summary>
/// <param name="parameterName">The name of the parameter to check</param>
/// <returns>True if the parameter is in the collection</returns>
public override bool Contains(string parameterName)
{
return (IndexOf(parameterName) != -1);
}
/// <summary>
/// Determines if the parameter exists in the collection
/// </summary>
/// <param name="value">The SQLiteParameter to check</param>
/// <returns>True if the parameter is in the collection</returns>
public override bool Contains(object value)
{
return _parameterList.Contains((SQLiteParameter) value);
}
/// <summary>
/// Not implemented
/// </summary>
/// <param name="array"></param>
/// <param name="index"></param>
public override void CopyTo(Array array, int index)
{
throw new NotImplementedException();
}
/// <summary>
/// Returns a count of parameters in the collection
/// </summary>
public override int Count
{
get { return _parameterList.Count; }
}
/// <summary>
/// Overloaded to specialize the return value of the default indexer
/// </summary>
/// <param name="parameterName">Name of the parameter to get/set</param>
/// <returns>The specified named SQLite parameter</returns>
public new SQLiteParameter this[string parameterName]
{
get { return (SQLiteParameter) GetParameter(parameterName); }
set { SetParameter(parameterName, value); }
}
/// <summary>
/// Overloaded to specialize the return value of the default indexer
/// </summary>
/// <param name="index">The index of the parameter to get/set</param>
/// <returns>The specified SQLite parameter</returns>
public new SQLiteParameter this[int index]
{
get { return (SQLiteParameter) GetParameter(index); }
set { SetParameter(index, value); }
}
/// <summary>
/// Retrieve a parameter by name from the collection
/// </summary>
/// <param name="parameterName">The name of the parameter to fetch</param>
/// <returns>A DbParameter object</returns>
protected override DbParameter GetParameter(string parameterName)
{
return GetParameter(IndexOf(parameterName));
}
/// <summary>
/// Retrieves a parameter by its index in the collection
/// </summary>
/// <param name="index">The index of the parameter to retrieve</param>
/// <returns>A DbParameter object</returns>
protected override DbParameter GetParameter(int index)
{
return _parameterList[index];
}
/// <summary>
/// Returns the index of a parameter given its name
/// </summary>
/// <param name="parameterName">The name of the parameter to find</param>
/// <returns>-1 if not found, otherwise a zero-based index of the parameter</returns>
public override int IndexOf(string parameterName)
{
int x = _parameterList.Count;
for (int n = 0; n < x; n++)
{
if (
String.Compare(parameterName, _parameterList[n].ParameterName, StringComparison.OrdinalIgnoreCase) ==
0)
return n;
}
return -1;
}
/// <summary>
/// Returns the index of a parameter
/// </summary>
/// <param name="value">The parameter to find</param>
/// <returns>-1 if not found, otherwise a zero-based index of the parameter</returns>
public override int IndexOf(object value)
{
return _parameterList.IndexOf((SQLiteParameter) value);
}
/// <summary>
/// Inserts a parameter into the array at the specified location
/// </summary>
/// <param name="index">The zero-based index to insert the parameter at</param>
/// <param name="value">The parameter to insert</param>
public override void Insert(int index, object value)
{
_unboundFlag = true;
_parameterList.Insert(index, (SQLiteParameter) value);
}
/// <summary>
/// Removes a parameter from the collection
/// </summary>
/// <param name="value">The parameter to remove</param>
public override void Remove(object value)
{
_unboundFlag = true;
_parameterList.Remove((SQLiteParameter) value);
}
/// <summary>
/// Removes a parameter from the collection given its name
/// </summary>
/// <param name="parameterName">The name of the parameter to remove</param>
public override void RemoveAt(string parameterName)
{
RemoveAt(IndexOf(parameterName));
}
/// <summary>
/// Removes a parameter from the collection given its index
/// </summary>
/// <param name="index">The zero-based parameter index to remove</param>
public override void RemoveAt(int index)
{
_unboundFlag = true;
_parameterList.RemoveAt(index);
}
/// <summary>
/// Re-assign the named parameter to a new parameter object
/// </summary>
/// <param name="parameterName">The name of the parameter to replace</param>
/// <param name="value">The new parameter</param>
protected override void SetParameter(string parameterName, DbParameter value)
{
SetParameter(IndexOf(parameterName), value);
}
/// <summary>
/// Re-assign a parameter at the specified index
/// </summary>
/// <param name="index">The zero-based index of the parameter to replace</param>
/// <param name="value">The new parameter</param>
protected override void SetParameter(int index, DbParameter value)
{
_unboundFlag = true;
_parameterList[index] = (SQLiteParameter) value;
}
/// <summary>
/// Un-binds all parameters from their statements
/// </summary>
internal void Unbind()
{
_unboundFlag = true;
}
/// <summary>
/// This function attempts to map all parameters in the collection to all statements in a Command.
/// Since named parameters may span multiple statements, this function makes sure all statements are bound
/// to the same named parameter. Unnamed parameters are bound in sequence.
/// </summary>
internal void MapParameters(SQLiteStatement activeStatement)
{
if (_unboundFlag == false || _parameterList.Count == 0 || _command._statementList == null) return;
int nUnnamed = 0;
string s;
int n;
int y = -1;
SQLiteStatement stmt;
foreach (SQLiteParameter p in _parameterList)
{
y ++;
s = p.ParameterName;
if (s == null)
{
s = String.Format(CultureInfo.InvariantCulture, ";{0}", nUnnamed);
nUnnamed++;
}
int x;
bool isMapped = false;
if (activeStatement == null)
x = _command._statementList.Count;
else
x = 1;
stmt = activeStatement;
for (n = 0; n < x; n++)
{
isMapped = false;
if (stmt == null) stmt = _command._statementList[n];
if (stmt._paramNames != null)
{
if (stmt.MapParameter(s, p))
isMapped = true;
}
stmt = null;
}
// If the parameter has a name, but the SQL statement uses unnamed references, this can happen -- attempt to map
// the parameter by its index in the collection
if (isMapped == false)
{
s = String.Format(CultureInfo.InvariantCulture, ";{0}", y);
stmt = activeStatement;
for (n = 0; n < x; n++)
{
if (stmt == null) stmt = _command._statementList[n];
if (stmt._paramNames != null)
{
if (stmt.MapParameter(s, p))
isMapped = true;
}
stmt = null;
}
}
}
if (activeStatement == null) _unboundFlag = false;
}
}
}

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