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public class TreeNodes{
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TreeNode branchNode = new TreeNodeCreate(branch.BranchName,branch.BranchId.toString(),"","~/Images/menuclose.gif");
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Groovy supports a few neat ways to work with SQL more easily and to make SQL more Groovy. You can perform queries and SQL statements, passing in variables easily with proper handling of statements, connections and exception handling thanks to closures.
import groovy.sql.Sql
def foo = 'cheese ......