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>
/// 处理条件方法
/// </summary>
/// <param name="conditionMember"></param>
/// <param name="ifTrueMember"></param>
/// <param name="ifFalseMember"></param>
/// <returns></returns>
protected virtual DataMember ResolveConditionalMethod(DataMember conditionMember, DataMember ifTrueMember, DataMember ifFalseMember)
{
if (conditionMember != null)
{
StringBuilder nameBuilder = new StringBuilder();
nameBuilder.Append("(CASE WHEN ");
if (conditionMember.MemberType == DataMemberType.None)
{
nameBuilder.Append(conditionMember?.Name);
}
else
{
nameBuilder.AppendFormat("{0}=1", conditionMember?.Name);
}
nameBuilder.AppendFormat(" THEN {0} ELSE {1})", ifTrueMember?.Name, ifFalseMember?.Name);
AddParam(conditionMember, ifTrueMember, ifFalseMember);
return(new DataMember(nameBuilder.ToString(), null, DataMemberType.Key));
}
return(null);
}
public Tuple <string, List <T> > GetSqlWhere(Expression exp)
{
DataMember member = Resolve(exp);
return(Tuple.Create(member.Name, _paramList));
}
/// <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));
}
}
public DataMember Resolve(Expression exp)
{
DataMember dataMember = null;
if (exp == null)
{
return(dataMember);
}
switch (exp.NodeType)
{
case ExpressionType.Negate:
case ExpressionType.NegateChecked:
case ExpressionType.Not:
case ExpressionType.Convert:
case ExpressionType.ConvertChecked:
case ExpressionType.ArrayLength:
case ExpressionType.Quote:
case ExpressionType.TypeAs:
dataMember = this.VisitUnary((UnaryExpression)exp);
break;
case ExpressionType.Add:
case ExpressionType.AddChecked:
case ExpressionType.Subtract:
case ExpressionType.SubtractChecked:
case ExpressionType.Multiply:
case ExpressionType.MultiplyChecked:
case ExpressionType.Divide:
case ExpressionType.Modulo:
case ExpressionType.And:
case ExpressionType.AndAlso:
case ExpressionType.Or:
case ExpressionType.OrElse:
case ExpressionType.LessThan:
case ExpressionType.LessThanOrEqual:
case ExpressionType.GreaterThan:
case ExpressionType.GreaterThanOrEqual:
case ExpressionType.Equal:
case ExpressionType.NotEqual:
case ExpressionType.Coalesce:
case ExpressionType.ArrayIndex:
case ExpressionType.RightShift:
case ExpressionType.LeftShift:
case ExpressionType.ExclusiveOr:
dataMember = this.VisitBinary((BinaryExpression)exp);
break;
case ExpressionType.TypeIs:
dataMember = this.VisitTypeIs((TypeBinaryExpression)exp);
break;
case ExpressionType.Conditional:
dataMember = this.VisitConditional((ConditionalExpression)exp);
break;
case ExpressionType.Constant:
dataMember = this.VisitConstant((ConstantExpression)exp);
break;
case ExpressionType.Parameter:
dataMember = this.VisitParameter((ParameterExpression)exp);
break;
case ExpressionType.MemberAccess:
dataMember = VisitMemberAccess((MemberExpression)exp);
break;
case ExpressionType.Call:
dataMember = VisitMethodCall((MethodCallExpression)exp);
break;
case ExpressionType.Lambda:
dataMember = this.VisitLambda((LambdaExpression)exp);
break;
case ExpressionType.New:
dataMember = this.VisitNew((NewExpression)exp);
break;
case ExpressionType.NewArrayInit:
case ExpressionType.NewArrayBounds:
dataMember = this.VisitNewArray((NewArrayExpression)exp);
break;
case ExpressionType.Invoke:
dataMember = this.VisitInvocation((InvocationExpression)exp);
break;
case ExpressionType.MemberInit:
dataMember = this.VisitMemberInit((MemberInitExpression)exp);
break;
case ExpressionType.ListInit:
dataMember = this.VisitListInit((ListInitExpression)exp);
break;
default:
throw new NotSupportedException(exp.NodeType.ToString());
}
return(dataMember);
}
