copy in

postgres导入数据的时候可以使用cpoy 命令进行数据导入,如果使用java操作copy命令则需要使用postgres提供的 jdbc 驱动中的CopyManager来实现

• 封装一下

public class PGCopyInUtils {
 /**
 * 将表中的数据导出到本地文件
 *
 * @param connection 连接
 * @param filePath 文件路径
 * @param tableOrQuery 表名 或者查询语句
 * @throws SQLException SQLException
 * @throws IOException IOException
 */ public static void copyToFile(Connection connection, String filePath, String tableOrQuery) throws SQLException, IOException {
 FileOutputStream fileOutputStream = null; try {
 CopyManager copyManager = new CopyManager((BaseConnection) connection);
 fileOutputStream = new FileOutputStream(filePath);
 String copyOut = "COPY " + tableOrQuery + " TO STDOUT DELIMITER AS ','"; final long line = copyManager.copyOut(copyOut, fileOutputStream);
 System.out.println(line);
 } finally { if (fileOutputStream != null) { try {
 fileOutputStream. close ();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 } /**
 * 将文件中的数据导入到数据库中
 *
 * @param connection 连接
 * @param filePath 文件路径
 * @param tableName 表名
 * @throws SQLException SQLException
 * @throws IOException IOException
 * @return long 导入的行数
 */ public static long copyFromFile(Connection connection, String filePath, String tableName) throws SQLException, IOException {
  fileInputStream  fileInputStream = null; try {
 CopyManager copyManager = new CopyManager((BaseConnection) connection);
 fileInputStream = new FileInputStream(filePath);
 String copyIn = "COPY " + tableName + " FROM STDIN DELIMITER AS ','"; return copyManager.copyIn(copyIn, fileInputStream);
 } finally { if (fileInputStream != null) { try {
 fileInputStream.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 }
}12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061 

• 使用

1. connection 数据库连接2. 文件路径3. 表名
PGCopyInUtils.copyFromFile(connection, Constants.COPY_DEVICE_DATA_FILE_PATH, Constants.TABLE_NAME);1234 

• 注意

以上文件内容的分隔符为"," 标准输入.