neo4j：以Java发送的有限查询

Question

For a website developed under Tomcat, I connect my program to a database neo4j. Connection is done through jdbc. My program is right now local, and the database is on a remote server. When I start Tomcat, it first check if specifics nodes are presents, and if not, it creates them. There are about 135 nodes. Problem : After about ten, the program stops, and stay in something like an infinite loop. I assume I should close something, but what? Here is my code :

private ResultSet sendCommand(String command) throws SQLException
    {
        try(Statement statement = _neo4jConnection.createStatement())
        {
            return statement.executeQuery(command);
        }
    }

and a function to call this code (all functions are based on the same structure)

public static Long createNode(NodeLabel labelName)
    {
        try
        {
            ResultSet rs = getInstance().sendCommand("CREATE (n:"+labelName+") RETURN id(n)");
            Long result= rs.next()?rs.getLong("id(n)"):null;
            rs.close();
            return result;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }       
    }

Answer 1

in my latest experiment I reused the same statement multiple times, not sure that is the best way but it seems to work good, too.

https://github.com/peterneubauer/blogs/tree/master/csv_jdbc , code at https://github.com/peterneubauer/blogs/blob/master/csv_jdbc/src/test/java/org/neo4j/jdbctest/JDBCTest.java

Answer 2

The only solution I found was to regularly disconnect and reconnect to the database (After about 20 statements). This is awful, but it works. Well, however, I gave up with jdbc for neo4j, too much issues, and catastrophical performances (about 1s to get one simple data), what occures still more issues!

Anyway, Thanks for your help

Niko