How to insert an array in a loop to the database

问题

I want to insert a set of arrays into a database(HANA) in a loop.My code is below:

public class jdemo {
   public static void main(String[] args) {
      Connection connection = null;
      try {                  
         connection = DriverManager.getConnection(
            "jdbc:sap://myhdb:30715/?autocommit=false",myname,mysecret);                  
      } catch (SQLException e) {
         System.err.println("Connection Failed. User/Passwd Error?");
         return;
      }
      if (connection != null) {
         try {
            int [] array=new int []{1,2,3};
            Array array1= connection.createArrayof("Integer",array)
            System.out.println("Connection to HANA successful!");
            String sql="INSERT INTO TABLE1 VALUES(1,ARRAY(?))"
            PreparedStatement stmt = connection.createStatement(sql);
            stmt.setArray(int,array1);
            stmt.executeUpdate(sql);

       } catch (SQLException e) {
          System.err.println("Query failed!");
       }
     }
   }
}

But this does not work. I tried with

Object [] array=new Object []{1,2,3};

This returned method create array of Connection is not supported.

My Table Schema looks like

ID   MARK
__   ____
10  {1,2,3}
11  {3,2,3}
12  {9,2,3}
13  {10,2,3}
14  {12,24,3}
18  {1,27,3}

I also want my data type as an integer array.Any help is appreciated.

回答1:

The topic of "ARRAY inserts into HANA" has been discussed a couple of times here on SO already. HANA only supports to store arrays via the ARRAY() function. This function does not take a list as the parameter, but only separate elements.

So, instead of

 String sql="INSERT INTO TABLE1 VALUES(1,ARRAY(?))"

you would have to write

String sql="INSERT INTO TABLE1 VALUES(1, ARRAY( 1, 2, 3))"

For the JDBC driver: HANA JDBC doesn't automatically handle JAVA arrays to HANA arrays - that's something the developer will have to do manually. (yes, it's not nice, I know).

In short: currently (HANA 1.0 SP12) arrays can basically be used internally (within a stored procedure), but they are not first-class-citizen data types. (<- that's my opinion!)

回答2:

Just an idea:
Instead of storing an array in your column, you can save a string separated by colons. When you query the data from your database, you can use split(","), and you automatically have your array that you need (after Integer.parseInt(String))

回答3:

You are using createStatement instead of prepareStatement. createStatement does nut support parameters!

Check https://docs.oracle.com/javase/tutorial/jdbc/basics/processingsqlstatements.html

And https://docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html

for details Hope this helps

Would be nice if you provide DDL, error messages etc. next time, then its easier to analyze.

来源：https://stackoverflow.com/questions/41625922/how-to-insert-an-array-in-a-loop-to-the-database

标签

java

jdbc

connection

database-connection

hana