protected virtual DataMember AppendMemberByCoalesce(DataMember left, ExpressionType expType, DataMember right)
{
var dataMembers = DataMemberUtil.GetKeyMember(left, right);
var memberKey = ToParamMember(dataMembers.Item1);
var memberValue = ToParamMember(dataMembers.Item2);
AddParam(memberKey, memberValue);
StringBuilder nameBuilder = new StringBuilder();
nameBuilder.AppendFormat("ISNULL({0},{1})", memberKey.Name, memberValue.Name);
return(new DataMember(nameBuilder.ToString(), null, DataMemberType.None));
}
/// <summary>
/// 拼接左边和右边参数的方法
/// </summary>
/// <param name="left"></param>
/// <param name="expType"></param>
/// <param name="right"></param>
/// <returns></returns>
protected virtual DataMember AppendMember(DataMember left, ExpressionType expType, DataMember right)
{
if (left == null && right == null)
{
return(null);
}
if (expType == ExpressionType.Coalesce)
{
return(AppendMemberByCoalesce(left, expType, right));
}
else
{
var dataMembers = DataMemberUtil.GetKeyMember(left, right);
var memberKey = ToParamMember(dataMembers.Item1);
var memberValue = ToParamMember(dataMembers.Item2);
AddParam(memberKey, memberValue);
StringBuilder nameBuilder = new StringBuilder();
nameBuilder.AppendFormat("({0} {1} {2})", memberKey?.Name, ResolveExpressionType(expType), memberValue?.Name);
return(new DataMember(nameBuilder.ToString(), null, DataMemberType.None));
}
}