public QuerySet <T> Where(T model)
{
ParameterExpression parameter = Expression.Parameter(typeof(T), "parameter");
var entityType = EntityCache.QueryEntity(typeof(T));
foreach (var item in entityType.Properties)
{
string name = item.Name;
object value = item.GetValue(model, null);
if (value != null)
{
if (item.PropertyType == typeof(int) || item.PropertyType == typeof(double) || item.PropertyType == typeof(decimal) || item.PropertyType == typeof(long))
{
if (Convert.ToDecimal(value) == 0)
{
continue;
}
}
else if (item.PropertyType == typeof(DateTime))
{
var time = Convert.ToDateTime(value);
if (time == DateTime.MinValue)
{
continue;
}
}
var whereExpress = Expression.Equal(Expression.Property(parameter, name), Expression.Constant(value));
WhereExpressionList.Add(Expression.Lambda <Func <T, bool> >(TrimExpression.Trim(whereExpress), parameter));
}
}
return(this);
}
/// <summary>
/// 增加查询条件
/// </summary>
/// <typeparam name="TResult">查询表达式的对象</typeparam>
/// <param name="predicate">查询表达式</param>
/// <returns></returns>
public QueryContext <T> Where <TResult>(string alisName, Expression <Func <TResult, bool> > predicate)
{
ExpressionModel em = new ExpressionModel();
em.Body = predicate.Body;
em.Model = typeof(TResult);
em.UnionAlisName = alisName;
WhereExpressionList.Add(em);
return(this);
}
public QuerySet <T> Where <TWhere1, TWhere2>(Expression <Func <TWhere1, TWhere2, bool> > exp)
{
//var sqlWhere = new WhereExpression(exp, $"Where_{Params.ParameterNames.Count()}_", SqlProvider);
//WhereBuilder.Append(sqlWhere.SqlCmd);
//if (sqlWhere.Param != null)
//{
// Params.AddDynamicParams(sqlWhere.Param);
//}
WhereExpressionList.Add(exp);
return(this);
}
/// <summary>
///
/// </summary>
/// <param name="where"></param>
/// <param name="truePredicate"></param>
/// <param name="falsePredicate"></param>
/// <returns></returns>
public ICommand <T> WhereIf(bool where, Expression <Func <T, bool> > truePredicate, Expression <Func <T, bool> > falsePredicate)
{
if (where)
{
WhereExpressionList.Add(truePredicate);
}
else
{
WhereExpressionList.Add(falsePredicate);
}
return(this);
}
/// <summary>
/// 带前置条件的Where判断
/// </summary>
/// <typeparam name="TWhere"></typeparam>
/// <param name="where"></param>
/// <param name="truePredicate"></param>
/// <param name="falsePredicate"></param>
/// <returns></returns>
public IQuerySet <T> WhereIf <TWhere>(bool where, Expression <Func <TWhere, bool> > truePredicate, Expression <Func <TWhere, bool> > falsePredicate)
{
if (where)
{
WhereExpressionList.Add(truePredicate);
}
else
{
WhereExpressionList.Add(falsePredicate);
}
return(this);
}
/// <summary>
///
/// </summary>
/// <param name="predicate"></param>
/// <returns></returns>
public ICommand <T> Where(Expression <Func <T, bool> > predicate)
{
WhereExpressionList.Add(predicate);
return(this);
}
public IQuerySet <T> Where <TWhere1, TWhere2>(Expression <Func <TWhere1, TWhere2, bool> > exp)
{
WhereExpressionList.Add(exp);
return(this);
}
public IQuerySet <T> Where <TWhere>(Expression <Func <TWhere, bool> > predicate)
{
WhereExpressionList.Add(predicate);
return(this);
}
/// <summary>
/// 动态化查讯(转换成表达式树集合) 注意，int参数不会判断为0的值
/// </summary>
/// <typeparam name="T">对应表</typeparam>
/// <param name="dynamicTree"></param>
/// <returns></returns>
public QuerySet <T> Where(Dictionary <string, DynamicTree> dynamicTree)
{
if (dynamicTree != null)
{
foreach (var key in dynamicTree.Keys)
{
DynamicTree tree = dynamicTree[key];
if (tree != null && !string.IsNullOrEmpty(tree.Value))
{
Type tableType = typeof(T);
if (!string.IsNullOrEmpty(tree.Table))
{
tableType = EntityCache.QueryEntity(tree.Table).Type;
}
//如果不存在对应表就使用默认表
ParameterExpression param = Expression.Parameter(tableType, "param");
object value = tree.Value;
if (value == null)
{
continue;
}
else if (tree.ValueType == DbType.DateTime)
{
value = Convert.ToDateTime(value);
}
else if (tree.ValueType == DbType.String)
{
value = Convert.ToString(value);
if ("" == value.ToString())
{
continue;
}
}
else if (tree.ValueType == DbType.Int32)
{
int number = Convert.ToInt32(value);
value = number;
if (0 == number)
{
continue;
}
}
Expression whereExpress = null;
switch (tree.Operators)
{
case ExpressionType.Equal: //等于
whereExpress = Expression.Equal(Expression.Property(param, tree.Field), Expression.Constant(value));
break;
case ExpressionType.GreaterThanOrEqual: //大于等于
whereExpress = Expression.GreaterThanOrEqual(Expression.Property(param, tree.Field), Expression.Constant(value));
break;
case ExpressionType.LessThanOrEqual: //小于等于
whereExpress = Expression.LessThanOrEqual(Expression.Property(param, tree.Field), Expression.Constant(value));
break;
case ExpressionType.Call: //模糊查询
var method = typeof(string).GetMethodss().FirstOrDefault(x => x.Name.Equals("Contains"));
whereExpress = Expression.Call(Expression.Property(param, tree.Field), method, new Expression[] { Expression.Constant(value) });
break;
default:
whereExpress = Expression.Equal(Expression.Property(param, tree.Field), Expression.Constant(value));
break;
}
WhereExpressionList.Add(Expression.Lambda(TrimExpression.Trim(whereExpress), param));
}
}
}
return(this);
}
public ICommand <T> Where(Expression <Func <T, bool> > predicate)
{
//WhereExpression = WhereExpression == null ? predicate : ((Expression<Func<T, bool>>)WhereExpression).And(predicate);
WhereExpressionList.Add(predicate);
return(this);
}