vertx returns

Today's project requires the server to pass data by returning a JSON object, the data in the JSON is a list object, and the list is a bunch of custom message objects. However, when you return, you receive empty data.Browser returns results{"Result": []}There must be data in the returned list, and the background test list is longer than 1.The configuration in Struts2.xml (where result returns the result for

Detailed descriptions of four functions of mysql_result mysql_fetch_row mysql_fetch_array mysql_fetch_object in php Mysql tutorial _ result (): The advantage lies in ease of use; its disadvantage is that there are few functions. One call can only obtain one row of elements in the result dataset, which is less efficient for large-scale database tutorials; The value of a field in the returned result set returned by the mysql_result () function. If successful, the function

In practice, the string series in c ++ -- function returns the local variable string (referencing the local string, the. c_str () function of the local string) When the function returns a string, we can define the return string and string . 1. Write a function that returns a string reference. std::string TestStringReference(){ std::string loal_str = "holy shi

Let's take a look at common date functions.Date functions:1. Last month: for example, the last month is 201201 :( CONVERT ([varchar] (6), dateadd (month, (-1), getdate (), (112 )))2, yesterday: 2012-02-02 CONVERT (varchar (100), GETDATE ()-1, 23)3. Today: 2012-02-03 CONVERT (varchar (100), GETDATE (), 23)4, last day of last month: 23:59:59. 997 dateadd (MS,-3, DATEADD (mm, DATEDIFF (mm, 0, getdate (), 0 ))5. On the first day of the month, 00:00:00. 000 DATEADD (mm, DATEDIFF (mm, 0, getdate (

Transfer from Http://blog.csdn.net/keshacookie/article/details/40717059?utm_source=tuicoolWe use slow system calls to describe system calls (function calls) that may be blocked forever, such as Accept,read. A system call that is never blocked means that a call may never be returned, and most network support functions fall into this category. For example, if no customer is connected to the server, the server does not return a guarantee for the call to accept. Similarly, if a customer never sends

We use slow system calls to describe the system calls (function calls) that may be blocked forever, such as accept. Read and so on. A system call that is never blocked means that a call may never be returned. Most network support functions fall into this category. For example, if no client is connected to the server, the server's call to accept does not return a guarantee. Similar to. Suppose a customer never sends a line of text that requires the server to be shot back. The server's call to rea

Class dbda{Public $host = "localhost";Public $uid = "root";Public $pwd = "";Public $dbname = "Lianxi";/*Query method: Executes the user-given SQL statement and returns the corresponding result$SQL: SQL statement that the user needs to execute$type: The type of SQL statement that the user needs to executeReturn: Returns TRUE or False if the query returns a two-dim

Tags: style blog color io using ar strong for DivNew project start want to use stored procedures to return the result set, the company often write, this only a few years to forget the almost, cost the eldest brother to do well. Leave a print for future review ...Oracle Returns a result set that needs to be used to the package, and the result set is returned as a cursor type (cursor). And the returned result set cannot take advantage of the EXEC store

The "previous" concept implies a logical ordering, but we know that the rows in the table are in a non-bony order, and we need to provide a concept that is equivalent to the "previous" and can be expressed in T-SQL expressions. An example of this logical equivalence is the "maximum value less than the current value". In T-SQL, you can use a related subquery such as the following to express the phrase:SELECT Orderid,orderdate,empid,custid,(SELECT MAX (O2.orderid) from order as, WHERE 02.orderidFr

First, the topic requirementsTitle: Returns the and of the largest sub-array in an integer array.Requirements: Enter an array of shapes, with positive numbers in the array and negative values. One or more consecutive integers in an array make up a sub-array, each of which has a and.If the array a[0] ... A[j-1] next to each other, allowing a[i-1], ... A[n-1], a[0] ... A[J-1] and the largest. Returns the posi

: Php Depending on the requirements, we provide two different forms of custom functions, one is to return the string, one is to return the array, both of the functions use recursive methods. First look at the function that returns the string format: Function get_str ($id = 0) { global $str; $sql = "Select Id,title from class where pid= $id"; $result = Mysql_ Query ($sql);//queries the classification of the PID subclasses if ($result mys

Requirements:Enter an array of shapes with positive and negative numbers in the array. One or more consecutive integers in an array make up a sub-array, each of which has a and. If the array a[0] ... A[j-1] next to each other, allowing a[i-1], ... A[n-1], a[0] ... A[J-1] and the largest. Returns the position of the largest subarray at the same time. The maximum value for the and of all sub-arrays. Requires a time complexity of O (n).Ideas:Pair Develop

Re.findall (pattern,string) searches for all matching characters, returns a list, gets the first match to be accessed Re.findall (pattern,string) [0], but returns an empty list if the FindAll does not match successfully. When you use the list subscript to access the element, you will be quoted Indexerror:list index out of range.Such as:>>>re.findall ('abc','abd') []>> >re.findall ('abc','abd' ) " in index

PHP uses the Json_decode () function to decode the JSON string, the first argument passes the string, the second argument is true, returns an array, or false to return an object. If NULL is returned, indicating an error, the output json_last_error (), the resulting integer value corresponding to the wrong hint.Json_last_error () is more common than the integer 4, which is a JSON string that was incomplete before Json_decode, so syntax error.Then must

Copy Code code as follows: ' Get rid of consecutive carriage returns and spaces at the ends of a string function Trimvbcrlf (str) TRIMVBCRLF=RTRIMVBCRLF (Ltrimvbcrlf (str)) End Function ' Remove successive carriage returns and spaces at the beginning of the string function Ltrimvbcrlf (str) Dim Pos,isblankchar Pos=1 Isblankchar=true While Isblankchar If mid (str,pos,1) = ""

Today's developer feedback a question that the program has been using for some time and suddenly reported an error while querying yesterday's data: Figure 1 Ora-01427:single-row subquery returns more than one row Exception is: Single row subquery returns multiple rows I got the corresponding SQL statement for the query page:Select ID, (select NAME from TABLE01 where TID = t.id) NAME from TABLE02 t where TY

(both the setContentType or the Setcharacterencoding method set encoding), and HttpServletResponse returns a default encoding ( ISO-8859-1) encoded PrintWriter instance. This will result in Chinese garbled. And the encoding must be set before calling Getwriter, otherwise it is invalid. 　　To write the interface code: The difference between the method here and the general Struts2 method is that the void return type is here. public void Write

Returns the latest ID method when SQL inserts data SELECT last_insert_id (). SELECT @ @IDENTITY to receive. But by the afternoon the brother was not done. Because I don't know how to run. The projects are all three floors. The basic is written in the DBHelper. The reason is that it was written to: Cmd. ExecuteNonQuery (); ---This is the number of rows that are returned affected by the execution of a non-query statement.is actually supposed to write:

Returnname; Add the SELECT @ @IDENTITY as returnname in the SQL statement; to get the value of the primary key To get the return value in the program: Copy Code code as follows: public int Sqlexecutereader (String sql) { Dbopen (); SqlCommand Mycomm = new SqlCommand (sql, Connection); int NewID = Convert.ToInt32 (Mycomm.executescalar ()); Dbclose (); return NewID; } Of course here the primary key is an automatic increment of type int. The operation of the d