/// <summary>
/// Creates a SqlExpression which represents a constant typed value.
/// </summary>
/// <param name="val">SqlConstant instance</param>
/// <returns>A SqlExpression which represents a date value</returns>
public static SqlExpression Constant(SqlConstant val)
{
SqlExpression expr = new SqlExpression();
expr.val = val;
expr.type = SqlExpressionType.Constant;
return(expr);
}
/// <summary>
/// Adds a value
/// </summary>
/// <param name="val">The value which is to be added</param>
/// <remarks>
/// This method automatically determins the type of the value and creates the appropriate SqlConstant object.
/// </remarks>
public void Add(object val)
{
if (val == null)
{
return;
}
SqlConstant constant;
if (val is string)
{
constant = SqlConstant.String((string)val);
}
else if (val is int)
{
constant = SqlConstant.Number((int)val);
}
else if (val is DateTime)
{
constant = SqlConstant.Date((DateTime)val);
}
else if (val is double)
{
constant = SqlConstant.Number((double)val);
}
else if (val is float)
{
constant = SqlConstant.Number((double)val);
}
else if (val is decimal)
{
constant = SqlConstant.Number((decimal)val);
}
else
{
constant = SqlConstant.String(val.ToString());
}
Add(constant);
}
/// <summary>
/// Creates a SqlExpression which represents a date value.
/// </summary>
/// <param name="val">Value of the expression</param>
/// <returns>A SqlExpression which represents a date value</returns>
public static SqlExpression Date(DateTime val)
{
return(Constant(SqlConstant.Date(val)));
}
/// <summary>
/// Creates a SqlExpression which represents a textual value.
/// </summary>
/// <param name="val">Value of the expression</param>
/// <returns>A SqlExpression which represents a textual value</returns>
public static SqlExpression String(string val)
{
return(Constant(SqlConstant.String(val)));
}
/// <summary>
/// Creates a SqlExpression which represents a numeric value.
/// </summary>
/// <param name="val">Value of the expression</param>
/// <returns>A SqlExpression which represents a numeric value</returns>
public static SqlExpression Number(int val)
{
return(Constant(SqlConstant.Number(val)));
}
/// <summary>
/// Removes the first occurrence of a specific SqlConstant from this SqlConstantCollection.
/// </summary>
/// <param name="value">
/// The SqlConstant value to remove from this SqlConstantCollection.
/// </param>
public virtual void Remove(SqlConstant value)
{
this.List.Remove(value);
}
/// <summary>
/// Inserts an element into the SqlConstantCollection at the specified index
/// </summary>
/// <param name="index">
/// The index at which the SqlConstant is to be inserted.
/// </param>
/// <param name="value">
/// The SqlConstant to insert.
/// </param>
public virtual void Insert(int index, SqlConstant value)
{
this.List.Insert(index, value);
}
/// <summary>
/// Return the zero-based index of the first occurrence of a specific value
/// in this SqlConstantCollection
/// </summary>
/// <param name="value">
/// The SqlConstant value to locate in the SqlConstantCollection.
/// </param>
/// <returns>
/// The zero-based index of the first occurrence of the _ELEMENT value if found;
/// -1 otherwise.
/// </returns>
public virtual int IndexOf(SqlConstant value)
{
return(this.List.IndexOf(value));
}
/// <summary>
/// Determines whether a specfic SqlConstant value is in this SqlConstantCollection.
/// </summary>
/// <param name="value">
/// The SqlConstant value to locate in this SqlConstantCollection.
/// </param>
/// <returns>
/// true if value is found in this SqlConstantCollection;
/// false otherwise.
/// </returns>
public virtual bool Contains(SqlConstant value)
{
return(this.List.Contains(value));
}
/// <summary>
/// Adds an instance of type SqlConstant to the end of this SqlConstantCollection.
/// </summary>
/// <param name="value">
/// The SqlConstant to be added to the end of this SqlConstantCollection.
/// </param>
public virtual void Add(SqlConstant value)
{
this.List.Add(value);
}