Exemple #1
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 // select
 public ResultSet query(String sql) throws Exception {
   Statement stmt = conn.createStatement();
   return stmt.executeQuery(sql);
 }
Exemple #2
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 // insert, create, update, delete...
 public int update(String sql) throws Exception {
   Statement stmt = conn.createStatement();
   int ret = stmt.executeUpdate(sql);
   stmt.close();
   return ret;
 }