// -
public override DbExpression Visit(DbSubtractExpression exp)
{
Stack<DbExpression> operands = GatherBinaryExpressionOperand(exp);
this.ConcatOperands(operands, " - ");
return exp;
}
public void Process(DbMethodCallExpression exp, SqlGeneratorBase generator)
{
DbSubtractExpression dbSubtract = new DbSubtractExpression(exp.Type, exp.Object, exp.Arguments[0]);
dbSubtract.Accept(generator);
}
// -
public override DbExpression Visit(DbSubtractExpression exp)
{
return(exp);
}
bool IsDateSubtract(DbMemberExpression exp)
{
MemberInfo member = exp.Member;
if (member.DeclaringType == PublicConstants.TypeOfTimeSpan)
{
if (exp.Expression.NodeType == DbExpressionType.Call)
{
DbMethodCallExpression dbMethodExp = (DbMethodCallExpression)exp.Expression;
if (dbMethodExp.Method == PublicConstants.MethodInfo_DateTime_Subtract_DateTime)
{
int?intervalDivisor = null;
if (member == UtilConstants.PropertyInfo_TimeSpan_TotalDays)
{
intervalDivisor = 24 * 60 * 60 * 1000;
goto appendIntervalTime;
}
if (member == UtilConstants.PropertyInfo_TimeSpan_TotalHours)
{
intervalDivisor = 60 * 60 * 1000;
goto appendIntervalTime;
}
if (member == UtilConstants.PropertyInfo_TimeSpan_TotalMinutes)
{
intervalDivisor = 60 * 1000;
goto appendIntervalTime;
}
if (member == UtilConstants.PropertyInfo_TimeSpan_TotalSeconds)
{
intervalDivisor = 1000;
goto appendIntervalTime;
}
if (member == UtilConstants.PropertyInfo_TimeSpan_TotalMilliseconds)
{
intervalDivisor = 1;
goto appendIntervalTime;
}
return(false);
appendIntervalTime:
this.CalcDateDiffPrecise(dbMethodExp.Object, dbMethodExp.Arguments[0], intervalDivisor.Value);
return(true);
}
}
else
{
DbSubtractExpression dbSubtractExp = exp.Expression as DbSubtractExpression;
if (dbSubtractExp != null && dbSubtractExp.Left.Type == PublicConstants.TypeOfDateTime && dbSubtractExp.Right.Type == PublicConstants.TypeOfDateTime)
{
DbMethodCallExpression dbMethodExp = new DbMethodCallExpression(dbSubtractExp.Left, PublicConstants.MethodInfo_DateTime_Subtract_DateTime, new List <DbExpression>(1)
{
dbSubtractExp.Right
});
DbMemberExpression dbMemberExp = DbExpression.MemberAccess(member, dbMethodExp);
dbMemberExp.Accept(this);
return(true);
}
}
}
return(false);
}
// -
public override DbExpression Visit(DbSubtractExpression exp)
{
return(exp.Accept(this._generator));
}
// - public abstract T Visit(DbSubtractExpression exp);
