如何在 SQLite 中模擬變數？

BEGIN; /* 开始事务 */

PRAGMA temp_store = 2; /* 使用内存模式创建临时表 */
CREATE TEMP TABLE _Variables(
  Name TEXT PRIMARY KEY,
  RealValue REAL,
  IntegerValue INTEGER,
  BlobValue BLOB,
  TextValue TEXT
);

INSERT INTO _Variables (Name) VALUES ('VariableName');

UPDATE _Variables SET IntegerValue = ... WHERE Name = 'VariableName';

... (
  SELECT COALESCE(RealValue, IntegerValue, BlobValue, TextValue)
  FROM _Variables
  WHERE Name = 'VariableName'
  LIMIT 1
) ...

DROP TABLE _Variables;
END; /* 结束事务 */