protected virtual SqlColumnsComparisonConstraint VisitSqlColumnsComparisonConstraint(SqlColumnsComparisonConstraint sqlColumnsConstraint)
{
this.Visit(sqlColumnsConstraint.LeftColumn);
this.Visit(sqlColumnsConstraint.RightColumn);
return(sqlColumnsConstraint);
}
protected override SqlColumnsComparisonConstraint VisitSqlColumnsComparisonConstraint(SqlColumnsComparisonConstraint node)
{
this.AppendColumnUsage(node.LeftColumn);
switch (node.Operator)
{
case SqlColumnConstraintOperator.Equal:
_sql.Append(" = ");
break;
case SqlColumnConstraintOperator.NotEqual:
_sql.Append(" != ");
break;
case SqlColumnConstraintOperator.Greater:
_sql.Append(" > ");
break;
case SqlColumnConstraintOperator.GreaterEqual:
_sql.Append(" >= ");
break;
case SqlColumnConstraintOperator.Less:
_sql.Append(" < ");
break;
case SqlColumnConstraintOperator.LessEqual:
_sql.Append(" <= ");
break;
default:
throw new NotSupportedException("两个属性之间的对比，只能使用 6 类基本对比。");
}
this.AppendColumnUsage(node.RightColumn);
return node;
}
protected virtual SqlColumnsComparisonConstraint VisitSqlColumnsComparisonConstraint(SqlColumnsComparisonConstraint sqlColumnsConstraint)
{
this.Visit(sqlColumnsConstraint.LeftColumn);
this.Visit(sqlColumnsConstraint.RightColumn);
return sqlColumnsConstraint;
}
