管理多个 SQL 语句中使用的公共代码

Question

我使用 SQL Developer 创建查询我们公司 Oracle 10g 数据库的 PL/SQL 语句，我发现这些查询有许多通用组件，例如在许多语句中相同的一组连接或条件。我的问题是，当我更新这些部分中的代码时，我必须跟踪并手动更新使用相同公共代码的所有其他语句，以便所有语句彼此一致且相互准确。

我还没有实现源代码控制系统。是否有源代码控制系统（SVN、TFS 或其他）允许我系统地管理各种 SQL 语句的这些“动态”子部分？我的想法是，一旦我更新了一个公共代码块，这些更新将级联并在我使用相同公共代码的任何其他语句中更新。

如果不存在这样的功能，您对按照我描述的方式管理数十个（如果不是数百个）不同的 SQL 语句有什么建议？

Answer 1

CREATE TABLE example_one
(
    eo_id    NUMBER
,   eo_value NUMBER
);

INSERT INTO example_one(eo_id, eo_value) VALUES(1, 10);    

CREATE TABLE example_two
(
    et_id    NUMBER
,   et_value NUMBER
);

INSERT INTO example_two(et_id, et_value) VALUES(1, 20);    

CREATE TABLE db_sql_statements
(
    s_stmt_id NUMBER
,   s_stmt    VARCHAR2(4000) /* should be CLOB - it can exceed 4000 CHAR */
);

INSERT INTO db_sql_statements(s_stmt_id, s_stmt) VALUES(1,'SELECT ~[columns_list_#00001]~ FROM ~[source_tables_#00001]~ ~[ON join_conditions_#00001]~ ~[WHERE where_conditions_#00001]~');
);

CREATE TABLE db_sql_parameters
(
    p_param_id VARCHAR2(4000)
,   p_param    VARCHAR2(4000)
);

INSERT INTO db_sql_parameters(p_param_id, p_param) VALUES('columns_list_#00001',     'eo.eo_id, eo.eo_value + et.et_value');
INSERT INTO db_sql_parameters(p_param_id, p_param) VALUES('source_tables_#00001',    'example_one eo JOIN example_two et');
INSERT INTO db_sql_parameters(p_param_id, p_param) VALUES('join_conditions_#00001',  'ON eo.eo_id = et.et_id');
INSERT INTO db_sql_parameters(p_param_id, p_param) VALUES('where_conditions_#00001', 'WHERE 1 = 1');

CREATE TABLE db_sql_stmt_param_bridge
(
    pb_stmt_id  NUMBER
,   pb_param_r  NUMBER
,   pb_param_id VARCHAR2(4000)
);

INSERT INTO db_sql_stmt_param_bridge(pb_stmt_id, pb_param_r, pb_param_id) VALUES(1, 1, 'columns_list_#00001');
INSERT INTO db_sql_stmt_param_bridge(pb_stmt_id, pb_param_r, pb_param_id) VALUES(1, 2, 'source_tables_#00001');
INSERT INTO db_sql_stmt_param_bridge(pb_stmt_id, pb_param_r, pb_param_id) VALUES(1, 3, 'join_conditions_#00001');
INSERT INTO db_sql_stmt_param_bridge(pb_stmt_id, pb_param_r, pb_param_id) VALUES(1, 4, 'where_conditions_#00001');

SELECT  s.s_stmt, p.p_param_id, p.p_param
FROM    db_sql_statements s
JOIN    db_sql_stmt_param_bridge pb
ON      s.s_stmt_id = pb.pb_stmt_id
JOIN    db_sql_parameters p
ON      pb.pb_param_id = p.p_param_id
;
/*
SELECT ~[columns_list_#00001]~ FROM ~[source_tables_#00001]~ ~[ON join_conditions_#00001]~ ~[WHERE where_conditions_#00001]~    columns_list_#00001 eo.eo_id, eo.eo_value + et.et_value
SELECT ~[columns_list_#00001]~ FROM ~[source_tables_#00001]~ ~[ON join_conditions_#00001]~ ~[WHERE where_conditions_#00001]~    source_tables_#00001    example_one eo JOIN example_two et
SELECT ~[columns_list_#00001]~ FROM ~[source_tables_#00001]~ ~[ON join_conditions_#00001]~ ~[WHERE where_conditions_#00001]~    join_conditions_#00001  ON eo.eo_id = et.et_id
SELECT ~[columns_list_#00001]~ FROM ~[source_tables_#00001]~ ~[ON join_conditions_#00001]~ ~[WHERE where_conditions_#00001]~    where_conditions_#00001 WHERE 1 = 1
*/

SELECT  REPLACE
        (
            REPLACE
            (
                REPLACE
                (
                    REPLACE
                    (
                        s_stmt
                    ,   '~[columns_list_#00001]~'
                    ,   p_param
                    )
                ,   '~[source_tables_#00001]~'
                ,   lead_p_param
                )
            ,   '~[ON join_conditions_#00001]~'
            ,   lead_p_param2
            )
        ,   '~[WHERE where_conditions_#00001]~'
        ,   lead_p_param3
        )
FROM
(
        SELECT  s.s_stmt
        ,       p.p_param_id
        ,       p.p_param
        ,       LEAD(p.p_param)    OVER (PARTITION BY s.s_stmt ORDER BY pb.pb_param_r) AS lead_p_param
        ,       LEAD(p.p_param, 2) OVER (PARTITION BY s.s_stmt ORDER BY pb.pb_param_r) AS lead_p_param2
        ,       LEAD(p.p_param, 3) OVER (PARTITION BY s.s_stmt ORDER BY pb.pb_param_r) AS lead_p_param3
        ,       ROW_NUMBER()       OVER (PARTITION BY s.s_stmt ORDER BY pb.pb_param_r) AS r_number
        FROM    db_sql_statements s
        JOIN    db_sql_stmt_param_bridge pb
        ON      s.s_stmt_id = pb.pb_stmt_id
        JOIN    db_sql_parameters p
        ON      pb.pb_param_id = p.p_param_id
)
WHERE   r_number = 1
;    
-- SELECT eo.eo_id, eo.eo_value + et.et_value FROM example_one eo JOIN example_two et ON eo.eo_id = et.et_id WHERE 1 = 1

SELECT eo.eo_id, eo.eo_value + et.et_value FROM example_one eo JOIN example_two et ON eo.eo_id = et.et_id WHERE 1 = 1;
-- 1    30

从 PL/SQL 运行它并使用 EXECUTE IMMEDIATE。 我在写db框架的时候做过类似的事情。