這篇文章主要講解了“動態(tài)SQL有哪些類型的語句格式”，文中的講解內(nèi)容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“動態(tài)SQL有哪些類型的語句格式”吧！

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1.Dynamic SQL Format 1

EXECUTE IMMEDIATE SQLStatement     {USING TransactionObject} ;

eg:
string            MySQL
Mysql = "CREATE TABLE Employee "&
    +"(emp_id integer not null,"&
    +"dept_id integer not null, "&
    +"emp_fname char(10) not null, "&
    +"emp_lname char(20) not null)"
EXECUTE IMMEDIATE :Mysql ;

2.Dynamic SQL Format 2

PREPARE DynamicStagingArea FROM SQLStatement     {USING TransactionObject} ;
EXECUTE DynamicStagingArea USING {ParameterList} ;

eg:
INT        Emp_id_var = 56
PREPARE SQLSA
    FROM "DELETE FROM employee WHERE emp_id=?" ;
EXECUTE SQLSA USING :Emp_id_var ;

3.Dynamic SQL Format 3

DECLARE Cursor | Procedure     DYNAMIC CURSOR | PROCEDURE      FOR DynamicStagingArea ;
PREPARE DynamicStagingArea FROM SQLStatement     {USING TransactionObject} ;
OPEN DYNAMIC Cursor     {USING ParameterList} ;
EXECUTE DYNAMIC Procedure    {USING ParameterList} ;
FETCH Cursor | Procedure     INTO HostVariableList ;
CLOSE Cursor | Procedure ;
eg:
integer Emp_id_var

DECLARE my_cursor DYNAMIC CURSOR FOR SQLSA ;
PREPARE SQLSA FROM "SELECT emp_id FROM employee" ;
OPEN DYNAMIC my_cursor ;
FETCH my_cursor INTO :Emp_id_var ;
CLOSE my_cursor ;

4.Dynamic SQL Format 4

DECLARE Cursor | Procedure     DYNAMIC CURSOR | PROCEDURE      FOR DynamicStagingArea ;
PREPARE DynamicStagingArea FROM SQLStatement    {USING TransactionObject} ;
DESCRIBE DynamicStagingArea    INTO DynamicDescriptionArea ;
OPEN DYNAMIC Cursor | Procedure    USING DESCRIPTOR DynamicDescriptionArea ;
EXECUTE DYNAMIC Cursor | Procedure    USING DESCRIPTOR DynamicDescriptionArea ;
FETCH Cursor | Procedure     USING DESCRIPTOR DynamicDescriptionArea ;
CLOSE Cursor | Procedure ;

eg:

string Stringvar, Sqlstatement
integer Intvar
Sqlstatement = "SELECT emp_id FROM employee"
PREPARE SQLSA FROM :Sqlstatement ;
DESCRIBE SQLSA INTO SQLDA ;
DECLARE my_cursor DYNAMIC CURSOR FOR SQLSA ;
OPEN DYNAMIC my_cursor USING DESCRIPTOR SQLDA ;
FETCH my_cursor USING DESCRIPTOR SQLDA ;

// If the FETCH is successful, the output
// descriptor array will contain returned
// values from the first row of the result set.
// SQLDA.NumOutputs contains the number of
// output descriptors.
// The SQLDA.OutParmType array will contain
// NumOutput entries and each entry will contain
// an value of the enumerated data type ParmType
// (such as TypeInteger!, or TypeString!).

CHOOSE CASE SQLDA.OutParmType[1]
CASE TypeString!
        Stringvar = GetDynamicString(SQLDA, 1)
    CASE TypeInteger!
        Intvar = GetDynamicNumber(SQLDA, 1)

END CHOOSE
CLOSE my_cursor ;

感謝各位的閱讀，以上就是“動態(tài)SQL有哪些類型的語句格式”的內(nèi)容了，經(jīng)過本文的學習后，相信大家對動態(tài)SQL有哪些類型的語句格式這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是創(chuàng)新互聯(lián)，小編將為大家推送更多相關知識點的文章，歡迎關注！