SQL/JDBC中的内联BLOB/BINARY数据类型

Question

假设我想避免在JDBC中使用绑定变量并使用"ad-hoc"语句运行SQL,例如:

connection.createStatement().executeQuery("SELECT ...");

是否有任何约定/ JDBC转义语法来内联BLOB数据类型？我知道H2有这样的语法:

INSERT INTO lob_table VALUES (X'01FF');

但那不是标准.任何一般解决方案 请注意,我对一般方法感兴趣.我知道这可能会变得非常低效.

Answer 1

可能没有JDBC转义语法,所以我搜索了一下,发现并成功测试了以下内容:

• SQL Server,Sybase ASE,Sybase SQL Anywhere

  INSERT INTO lob_table VALUES (0x01FF);
  

• DB2

  -- Use a blob constructor. This is not needed for VARCHAR FOR BIT DATA types
  INSERT INTO lob_table VALUES (blob(X'01FF'));
  

• Derby,H2,HSQLDB,Ingres,MySQL,SQLite

  INSERT INTO lob_table VALUES (X'01FF');
  

• 神谕

  -- As mentioned by a_horse_with_no_name, keep in mind the relatively low
  -- limitation of Oracle's VARCHAR types to hold only 4000 bytes!
  INSERT INTO lob_table VALUES (hextoraw('01FF'));
  

• Postgres的

  -- There is also hex encoding as of Postgres 9.0
  -- The explicit cast is important, though
  INSERT INTO lob_table VALUES (E'\\001\\377'::bytea);
  

  有关Postgres十六进制编码的更多详细信息,请参阅AH的答案

• SQL标准

  -- SQL actually defines binary literals as such 
  -- (as implemented by DB2, Derby, H2, HSQLDB, Ingres, MySQL, SQLite):
  <binary string literal> ::=
    X <quote> [ <space>... ] 
    [ { <hexit> [ <space>... ] <hexit> [ <space>... ] }... ] <quote>
  
  <hexit> ::=
    <digit> | A | B | C | D | E | F | a | b | c | d | e | f