Parameters:
sql - an SQL statement that may contain one or more '?' IN
parameter placeholders
columnNames - an array of column names indicating the columns
that should be returned from the inserted row or rows////////////////////参数说明
Returns:
a new PreparedStatement object, containing the
pre-compiled statement, that is capable of returning the
auto-generated keys designated by the given array of column
names
参数说明中讲了，insert时，返回的列
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