/// <summary>
/// Prepends the DbExpression with the supplied DbExpression using an OR clause.
/// </summary>
/// <param name="prepend">The DbExpression to prepend.</param>
public void PrependOr(DbExpression prepend)
{
if (prepend == null)
{
throw new ArgumentNullException(nameof(prepend));
}
DbExpression orig = new DbExpression(this.LeftTerm, this.Operator, this.RightTerm);
DbExpression e = PrependOrClause(prepend, orig);
LeftTerm = e.LeftTerm;
Operator = e.Operator;
RightTerm = e.RightTerm;
return;
}
/// <summary>
/// A structure in the form of term-operator-term that defines a Boolean expression within a WHERE clause.
/// </summary>
/// <param name="left">The left term of the expression; can either be a string term or a nested DbExpression.</param>
/// <param name="oper">The operator.</param>
/// <param name="right">The right term of the expression; can either be an object for comparison or a nested DbExpression.</param>
public DbExpression(object left, DbOperators oper, object right)
{
LeftTerm = left;
Operator = oper;
RightTerm = right;
}
/// <summary>
/// Prepends a new DbExpression using the supplied left term, operator, and right term using an OR clause.
/// </summary>
/// <param name="left">The left term of the expression; can either be a string term or a nested DbExpression.</param>
/// <param name="oper">The operator.</param>
/// <param name="right">The right term of the expression; can either be an object for comparison or a nested DbExpression.</param>
public void PrependOr(object left, DbOperators oper, object right)
{
DbExpression e = new DbExpression(left, oper, right);
PrependOr(e);
}
/// <summary>
/// Convert a WatsonORM DbOperators to a DatabaseWrapper Core Operators.
/// </summary>
/// <param name="oper">WatsonORM DbOperators.</param>
/// <returns>DatabaseWrapper Core Operators.</returns>
public static Operators DbOperatorsConverter(DbOperators oper)
{
switch (oper)
{
case DbOperators.And:
return(Operators.And);
case DbOperators.Or:
return(Operators.Or);
case DbOperators.Equals:
return(Operators.Equals);
case DbOperators.NotEquals:
return(Operators.NotEquals);
case DbOperators.In:
return(Operators.In);
case DbOperators.NotIn:
return(Operators.NotIn);
case DbOperators.Contains:
return(Operators.Contains);
case DbOperators.ContainsNot:
return(Operators.ContainsNot);
case DbOperators.StartsWith:
return(Operators.StartsWith);
case DbOperators.StartsWithNot:
return(Operators.StartsWithNot);
case DbOperators.EndsWith:
return(Operators.EndsWith);
case DbOperators.EndsWithNot:
return(Operators.EndsWithNot);
case DbOperators.GreaterThan:
return(Operators.GreaterThan);
case DbOperators.GreaterThanOrEqualTo:
return(Operators.GreaterThanOrEqualTo);
case DbOperators.LessThan:
return(Operators.LessThan);
case DbOperators.LessThanOrEqualTo:
return(Operators.LessThanOrEqualTo);
case DbOperators.IsNull:
return(Operators.IsNull);
case DbOperators.IsNotNull:
return(Operators.IsNotNull);
default:
throw new ArgumentException("Unknown operator '" + oper.ToString() + "'.");
}
}
