Inserting data in cassandra without puting in single quotes using cql java driver -

-

I have trouble troubleshooting those single quotes for ASCII / timestamp columns and other types like int, decimals, Boolean etc. is not putting.

The data comes from another DB / table, which is a SQL.

I have all the column data as strings. I do not want to format every column data to check empty values ​​and then decide to keep the quote.

Whether using ready statement, it is possible to prepare the inserted data in value or whatever

If you do not want to write a loader who uses a ready statement (via the CQL driver .. which is a good idea), I can think of another method. To import without using single quotation marks, you should be able to complete it with the COPY FROM CQL3 command (Setting the QUOTE parameter for an empty string) needed. If you can dump your RDBMS data into a CSV file, then you should be able to insert those values ​​in the cassandra in such a way: 

  COPY myColumnFamily (colname1, colname2, colname3 ) With '/ home / myUser coat / rdbmsdata.csv' = '';   
 See the  COPY  command for more information can be found.  
  Edit:   
 I also read the above question and assume that you did not want a prepared statement-based answer. Since this is not a clear matter, I thought I would provide a data here (using the JavaCLL driver of Datacax). Note that this answer is based on my column family and column names above my example, and assumes that  is col1  (only) the primary key.  
  generated statement = Session.prepare ("myKeyspace.myColumnFamily UPDATE" + "SET col2 =?, Col3 =?" + "WHERE col1 =?"); Boundstatism bound condition = statement. Bind (stroke 2, stroke 3, stroke 1); Session.execute (boundStatement);   
 For this solution, you do not need to finish your string data in a single quote, and there are some additional benefits on your string. ReplaceAll:  
     
  •  Allows you to insert values ​​containing single quotes.  
  •  Your protection from CQL-injection (less-known relative) escapes your values.  
  •  In CQL, both  UPDATE  and  INSERT  adds a record if it does not exist and update it (effectively "UPSERT" Is known as). Supports columns from a  INSERT  at a  UPDATE  (if your schema is using them).  
  •  Ready statements are fast because they allow Cassandra to parse only the query once, and then run the same query again with different values.   
     For more information, check out.

Comments

Post a Comment

Popular posts from this blog

ios - Adding an SKSpriteNode to SKScene from a child SKSpriteNode -

-
I have a SKScene where I am adding an SKSpriteNode I have subclassed the SKSpriteNode class to create this node. In the subclass I am defining some SKActions on Sprite. What do I want to do when the end of this phantom ends the SKAction sequence, then I add a new Prayer node to this scene. How is this possible. The following code is mine: The code for the sequence is that I'm running on the Scansprinitode subclass (TEMissileNode): - SKAction * moveDown = [SKAction moveToY: Self.position.y - 20 Duration: 0.2]; SKAction * animation = [SKAction animateWithTextures: textures timePerFrame: time / 7]; SKAction * moveMissileProjectile = [SKAction Moving: Pointoffscreen Term: Time]; SKAction * group = [SKAction group: @ [animation, movement projectile]]; SKAction * Sequence = [SKAction Sequence: @ [Hilldown, Group, [SKAction removalFromParent]]]; [Self run action: sequence]; From the main scene, I call those actions that execute these tasks TEMissileNode * missile = [tmissil...
Read more

Matlab transpose a table vector -

-
An embarrassing simple question seems to be, but how can I move a Matlab table vector? aTableT = aTable '; I tried a standard syntax for the simple interaction of a line vector to a line vector aTable : ATableT = reshape (aTable, 1, Height (aTable)); and aTableT = rot90 (aTable); According to the head, the last time table should work for table, see. However, I get this error code: Error type in using table / permit (line 396) Undefined function 'permute' for the input arguments. Error in rot 90 (line 29) b = magnitude (b, [2 1 3: ndims (a)]); NB: fliplr is not useful either pretty sure I have covered clear angles - any ideas? Thanks! Try changing your table into an array, move it, then back to a table In other words, try doing this: aTableArray = table2array (aTable); ATableT = array 2table (aTableArray. '); I have also read the document for rot90 , and it says that rot90 is definitely working for tables Do, and I find you...
Read more

c# - Textbox not clickable but editable -

-
I have a small form with 10 text boxes, I have set them in the correct tab order. I want them on my tab service I was wondering if there is a way to set the text box so that they can be selected for editing until they are tabbed. That is ... I do not want the end user to edit the text box to click on them, I just want to make them editable through tabu. this should do the trick public partial category poor text box: Text Box {Safe Override Zero WndProc (Ref: Message Message) {if (m.msg == (Int) WM.LBUTTONDOWN) {Return; // mount down events} base.WndProc (ref m); }} Window message enum can be found. How to do this without anherizing: text box : class EatMouseDown: netwindows {safe override zero WndProc (ref message message) {if (m.msg == (int) WM.LBUTTONDOWN) {return; } Base.WandProc (Ref M); }} Safe Override Zero Onload (EventEurge E) {base.OnLoad (e); How to do this without any part: left a clean part, whatever is important, this can be a buggy but it works R...
Read more