JDBC SQL轉義語法是什麼意思？請解釋一下

轉義語法可讓您使用特定於資料庫的功能，這些功能無法透過使用標準的JDBC方法和屬性來實現。

一般的SQL轉義語法格式如下：

{keyword 'parameters'}

Following are various escape syntaxes in JDBC:

d, t, ts Keywords: They help identify date, time, and timestamp literals. As you know, no two DBMSs represent time and date the same way. This escape syntax tells the driver to render the date or time in the target database's for| yyyy = year, mm = month; dd = date. Using this syntax {d '2009-09-03'} is March 9, 2009.

Example

{d 'yyyy-mm-dd'}

escape關鍵字

//Create a Statement object
stmt = conn.createStatement();
//Insert data ==> ID, First Name, Last Name, DOB
String sql="INSERT INTO STUDENTS VALUES" + "(100,'Zara','Ali', {d '2001-12-16'})";
stmt.executeUpdate(sql);

##fn Keyword

This keyword represents scalar functions used in a DBMS. For example, you can use SQL function

to get the length of a string −##

String sql = "SELECT symbol FROM MathSymbols WHERE symbol LIKE '\%' {escape '\'}";
stmt.execute(sql);

{fn length('Hello World')}

{call my_procedure(?)};

{? = call my_procedure(?)};

{oj outer-join}

登入後複製

String sql = "SELECT Employees FROM {oj ThisTable RIGHT OUTER JOIN ThatTable on id = '100'}";
stmt.execute(sql);

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