Some implementations of ``++java.sql.ResultSet#getMetaData()++`` suffer from performance issue and should not be called in a loop. Instead, multiple calls in a row should be replaced by a single cached call.

== Noncompliant Code Example

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ResultSetMetaData rsmd = rs.getMetaData();
for (int i=1; i<rsmd.getColumnCount(); i++) {
  System.out.println(rs.getMetaData().getAutoIncrement()); // Noncompliant; "rs.getMetaData()" will be called for each columns
}
----

== Compliant Solution

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ResultSetMetaData rsmd = rs.getMetaData(); // Compliant; result of "rs.getMetaData()" is cached
for (int i=1; i<rsmd.getColumnCount(); i++) {
  System.out.println(rsmd.getAutoIncrement());
}
----