syntax

问题 The following code creates a SQL string which produces a syntax error (3134) in MS Access. sql = "INSERT INTO tblItems (desc, descExtended, itemNumber, currentPrice) " & _ "VALUES (" & _ "'" & rs.Fields("Field6") & "', " & _ "'" & rs.Fields("Field7") & "', " & _ rs.Fields("Field1") & ", " & _ rs.Fields("Field8") & _ ")" db.Execute sql, dbFailOnError The value of the "sql" string which produces the syntax error is: "INSERT INTO tblItems (desc, descExtended, itemNumber, currentPrice) VALUES (

问题 The following code creates a SQL string which produces a syntax error (3134) in MS Access. sql = "INSERT INTO tblItems (desc, descExtended, itemNumber, currentPrice) " & _ "VALUES (" & _ "'" & rs.Fields("Field6") & "', " & _ "'" & rs.Fields("Field7") & "', " & _ rs.Fields("Field1") & ", " & _ rs.Fields("Field8") & _ ")" db.Execute sql, dbFailOnError The value of the "sql" string which produces the syntax error is: "INSERT INTO tblItems (desc, descExtended, itemNumber, currentPrice) VALUES (

问题 I have always written my For-loops like this: For foo = 1 to 10 ' do something Next However, when I read code snippets online, people always do this: For foo = 1 to 10 ' do something Next foo I have not noticed any difference between the two, and I can't find any documentation on next statement is more desirable. What is the difference between those two (if any)? 回答1: The counter after the Next statement is optional. It used to be required in BASIC-derived languages, but this is no longer the

问题 I would like to know that can I use my native language characters (or String) as JAVA variable names ? So, I had tested as below with Myanmar Unicode. public static void main(final String[] args) { String ဆဆဆ = "မောင်မောင်"; System.out.println("ကောင်းသောနေ.ပါ " + ဆဆဆ); } This code show my successful message as 'ကောင်းသောနေ.ပါ မောင်မောင်' . But in below code with another variable name ( it also my native language String )..... public static void main(final String[] args) { String တက်စတင်း =

问题 This question already has answers here : Closed 9 years ago . Possible Duplicates: C++ weird constructor syntax Variables After the Colon in a Constructor What does a colon ( : ) following a C++ constructor name do? For the C++ function below: cross(vector<int> &L_, vector<bool> &backref_, vector< vector<int> > &res_) : L(L_), c(L.size(), 0), res(res_), backref(backref_) { run(0); } What does the colon (":") tell the relationships between its left and right part? And possibly, what can be

问题 in c#, var x = new {}; declares an anonymous type with no properties. Is this any different from var x = new object(); ? 回答1: Yes, the types used are different. You can tell this at compile-time: var x = new {}; // Won't compile - no implicit conversion from object to the anonymous type x = new object(); If you're asking whether new{} is ever useful - well, that's a different matter... I can't immediately think of any sensible uses for it. 回答2: Well, for starters, object is an actual, non

问题 in c#, var x = new {}; declares an anonymous type with no properties. Is this any different from var x = new object(); ? 回答1: Yes, the types used are different. You can tell this at compile-time: var x = new {}; // Won't compile - no implicit conversion from object to the anonymous type x = new object(); If you're asking whether new{} is ever useful - well, that's a different matter... I can't immediately think of any sensible uses for it. 回答2: Well, for starters, object is an actual, non

问题 I came across this in the following context from B. Pfaff's "Analysis of Integrated and Cointegrated Time Series in R" ## Impulse response analysis of SVAR A−type model 1 args (vars ::: irf.svarest) 2 irf.svara <− irf (svar.A, impulse = ”y1 ” , 3 response = ”y2 ” , boot = FALSE) 4 args (vars ::: plot.varirf) 5 plot (irf.svara) 回答1: From the help file (you can see this with help(":::") ): The expression 'pkg::name' returns the value of the exported variable 'name' in package 'pkg' if the

问题 I came across this in the following context from B. Pfaff's "Analysis of Integrated and Cointegrated Time Series in R" ## Impulse response analysis of SVAR A−type model 1 args (vars ::: irf.svarest) 2 irf.svara <− irf (svar.A, impulse = ”y1 ” , 3 response = ”y2 ” , boot = FALSE) 4 args (vars ::: plot.varirf) 5 plot (irf.svara) 回答1: From the help file (you can see this with help(":::") ): The expression 'pkg::name' returns the value of the exported variable 'name' in package 'pkg' if the

问题 I can only assume it's an infinite loop. Can I leave out any of the three expressions in a for loop? Is there a default for each when omitted? 回答1: It is indeed an infinite loop. Under the hood the compiler/jitter will optimize this to (effectively) a simple JMP operation. It's also effectively the same as: while (true) { } (except that this is also optimized away, since the (true) part of a while expression usually requires some sort of comparison, however in this case, there's nothing to