MySQL中使用流式查询避免数据OOM

public int execute(String sql, boolean isStreamQuery) throws SQLException {
 Connection conn = null;
 PreparedStatement stmt = null;
 ResultSet rs = null;
 int count = 0;
 try {
  //获取数据库连接
  conn = getConnection();
  if (isStreamQuery) {
   //设置流式查询参数
   stmt = conn.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
   stmt.setFetchSize(Integer.MIN_VALUE);
  } else {
   //普通查询
   stmt = conn.prepareStatement(sql);
  }

  //执行查询获取结果
  rs = stmt.executeQuery();
  //遍历结果
  while(rs.next()){
   System.out.println(rs.getString(1));
   count++;
  }
 } catch (SQLException e) {
  e.printStackTrace();
 } finally {
  close(stmt, rs, conn);
 }
 return count;
}

@Test
public void testCommonBigData() throws SQLException {
 String sql = "select  from my_test";
 testExecute(sql, false);
}

@Test
public void testStreamBigData() throws SQLException {
 String sql = "select  from my_test";
 testExecute(sql, true);
}

@Test
public void testCommonSmallData() throws SQLException {
 String sql = "select  from my_test limit 100000, 10";
 testExecute(sql, false);
}

@Test
public void testStreamSmallData() throws SQLException {
 String sql = "select  from my_test limit 100000, 10";
 testExecute(sql, true);
}