/// <summary>
/// 创建Sql查询条件
/// </summary>
/// <param name="left">左操作数</param>
/// <param name="right">右操作数</param>
/// <param name="operator">操作符</param>
public static Abstractions.ICondition Create <TEntity>(QueryContainerDescriptor <TEntity> queryContainerDescriptor, string column, object obj, Operator @operator) where TEntity : class
{
var func = Lambda.CreateExpression <TEntity>(column);
switch (@operator)
{
case Operator.Equal:
if (obj == null)
{
return(new MississCondition(new ExistsCondition <TEntity>(queryContainerDescriptor, column)));
}
return(new TermCondition <TEntity>(queryContainerDescriptor, GetFuncObject <TEntity>(column), obj));
case Operator.NotEqual:
if (obj == null)
{
return(new ExistsCondition <TEntity>(queryContainerDescriptor, column));
}
var left = new TermCondition <TEntity>(queryContainerDescriptor, GetFuncObject <TEntity>(column), obj);
return(new MustNotCondition(left));
case Operator.Greater:
case Operator.Less:
case Operator.GreaterEqual:
case Operator.LessEqual:
var type = obj.GetType();
type = Common.GetType(type);
return(GetRangeCondition(type, queryContainerDescriptor, GetFuncObject <TEntity>(column), obj, @operator));
case Operator.Contains:
return(new MatchPhraseCondition <TEntity>(queryContainerDescriptor, GetFuncObject <TEntity>(column), obj));
case Operator.Starts:
return(new PrefixCondition <TEntity>(queryContainerDescriptor, GetFuncObject <TEntity>(column), obj));
case Operator.In:
return(CreateInCondition <TEntity>(queryContainerDescriptor, column, obj as IEnumerable));
case Operator.NotIn:
return(CreateInCondition <TEntity>(queryContainerDescriptor, column, obj as IEnumerable, true));
//case Operator.Ends:
// return new LikeCondition(left, right); //SUFFIX
}
throw new NotImplementedException($"运算符 {@operator.Description()} 未实现");
}
private static Expression <Func <TEntity, object> > GetFuncObject <TEntity>(string column)
{
return(Lambda.CreateExpression <TEntity>(column));
}
