DLA SQL分析函數：SQL語句審計與分析的利器
1. 簡介
Data Lake Analytics（https://www.aliyun.com/product/datalakeanalytics）最新release一組SQL內置函數，用來進行SQL語句的分析、信息提取，方便用戶對SQL語句進行語法層面的審計、分析，能夠應用於不少安全、數據庫日誌分析等場景。參考DLA（Data Lake Analytics）以前的文檔，只要您的SQL語句文本保存在DLA支持的數據源系統中，就能使用DLA的SQL分析函數，方便、快捷的進行SQL語句的審計和分析，或者基於此構建相關應用程序和系統。html
前提條件，您的SQL語句文本已經做爲一個字符串、文本字段存儲在DLA支持的數據源中，或者在統一格式的日誌文件中，日誌文件放到OSS中（應用本身上傳、開源日誌工具上傳、日誌服務投遞（https://help.aliyun.com/document_detail/107980.html）、Datahub投遞等），而後採用DLA進行SQL分析。mysql
2. SQL分析函數詳解
全部提供的SQL分析函數都是scalar標量函數。SQL分析函數支持多種SQL方言，默認SQL方言是mysql。sql
| SQL方言 |
|---|
| mysql |
| postgresql |
| oracle |
| db2 |
| sqlserver |
| hive |
| odps |
支持的函數列表：數據庫
| Name | Description |
|---|---|
| sql_export_columns | 提取SQL語句中全部出現的列 |
| sql_export_functions | 提取SQL語句中全部出現的函數 |
| sql_export_predicate_columns | 提取SQL語句中全部出現的謂詞條件表達式涉及的列 |
| sql_export_predicates | 提取SQL語句中全部出現的謂詞條件表達式 |
| sql_export_select_list_columns | 提取SQL語句中SELECT子句表達式中出現的列（包括子查詢） |
| sql_export_tables | 提取SQL語句中全部出現的表 |
| sql_format | 對SQL語句進行格式化 |
| sql_params | 提取SQL語句中全部的literal值 |
| sql_pattern | 提取SQL語句參數化後的SQL pattern，literal用?代替 |
| sql_pattern_hash | 提取sqlText的SQL語句參數化後的SQL pattern，並生成hash值 |
| sql_syntax_check | 對sqlText進行語法檢查 |
2.1 sql_export_columns
函數調用形式：數組
- sql_export_columns(sqlText)
- sql_export_columns(sqlText, dbType)
- sql_export_columns(sqlText, dbType, throwError)
參數說明：安全
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:oracle
| 類型 | 說明 |
|---|---|
| VARCHAR | sqlText的SQL語句中全部出現的列，用逗號分隔，列所屬的表會進行關聯推導，若是沒有找到明確的表，則爲UNKNOWN |
示例：函數
SELECT sql_export_columns(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sql_export_columns(a.sql_text) |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| UNKNOWN.s_acctbal,UNKNOWN.s_name,UNKNOWN.n_name,UNKNOWN.p_partkey,UNKNOWN.p_mfgr,UNKNOWN.s_address,UNKNOWN.s_phone,UNKNOWN.s_comment,UNKNOWN.ps_partkey,UNKNOWN.s_suppkey,UNKNOWN.ps_suppkey,UNKNOWN.p_size,UNKNOWN.p_type,UNKNOWN.s_nationkey,UNKNOWN.n_nationkey,UNKNOWN.n_regionkey,UNKNOWN.r_regionkey,UNKNOWN.r_name,UNKNOWN.ps_supplycost |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2.2 sql_export_functions
函數調用形式：工具
- sql_export_functions(sqlText)
- sql_export_functions(sqlText, dbType)
- sql_export_functions(sqlText, dbType, throwError)
參數說明：sqlserver
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | sqlText的SQL語句中全部出現的函數名，用逗號分隔，列所屬的表會進行關聯推導，若是沒有找到明確的表，則爲UNKNOWN |
示例：
SELECT sql_export_functions(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+----------------------------------+
| sql_export_functions(a.sql_text) |
+----------------------------------+
| min |
+----------------------------------+
2.3 sql_export_predicate_columns
函數調用形式：
- sql_export_predicate_columns(sqlText)
- sql_export_predicate_columns(sqlText, dbType)
- sql_export_predicate_columns(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | sqlText的SQL語句中出如今謂詞條件表達式中的列名，用逗號分隔，列所屬的表會進行關聯推導，若是沒有找到明確的表，則爲UNKNOWN |
示例：
SELECT sql_export_predicate_columns(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sql_export_predicate_columns(a.sql_text) |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| UNKNOWN.p_partkey,UNKNOWN.ps_partkey,UNKNOWN.s_suppkey,UNKNOWN.ps_suppkey,UNKNOWN.p_size,UNKNOWN.p_type,UNKNOWN.s_nationkey,UNKNOWN.n_nationkey,UNKNOWN.n_regionkey,UNKNOWN.r_regionkey,UNKNOWN.r_name,UNKNOWN.ps_supplycost |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2.4 sql_export_predicates
函數調用形式：
- sql_export_predicates(sqlText)
- sql_export_predicates(sqlText, dbType)
- sql_export_predicates(sqlText, dbType, compactValues)
- sql_export_predicates(sqlText, dbType, compactValues, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| compactValues | BOOLEAN | 可選。true時，謂詞條件中值以數組的形式出如今返回值中 |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | sqlText的SQL語句中全部出現的謂詞條件表達式元素數組，用逗號分隔，列所屬的表會進行關聯推導，若是沒有找到明確的表，則爲UNKNOWN |
示例：
SELECT sql_export_predicates(a.sql_text, 'mysql', true)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sql_export_predicates(a.sql_text) |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| [["UNKNOWN","p_partkey","=",null],["UNKNOWN","ps_partkey","=",null],["UNKNOWN","s_suppkey","=",null],["UNKNOWN","ps_suppkey","=",null],["UNKNOWN","p_size","=",35],["UNKNOWN","p_type","LIKE","%NICKEL"],["UNKNOWN","s_nationkey","=",null],["UNKNOWN","n_nationkey","=",null],["UNKNOWN","n_regionkey","=",null],["UNKNOWN","r_regionkey","=",null],["UNKNOWN","r_name","=",["MIDDLE EAST","MIDDLE EAST"]],["UNKNOWN","ps_supplycost","IN",null]] |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2.5 sql_export_select_list_columns
函數調用形式：
- sql_export_select_list_columns(sqlText)
- sql_export_select_list_columns(sqlText, dbType)
- sql_export_select_list_columns(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | sqlText的SQL語句中SELECT子句返回列中出現的列名列表（包括子查詢），用逗號分隔，列所屬的表會進行關聯推導，若是沒有找到明確的表，則爲UNKNOWN |
示例：
SELECT sql_export_select_list_columns(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sql_export_select_list_columns(a.sql_text) |
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| UNKNOWN.s_acctbal,UNKNOWN.s_name,UNKNOWN.n_name,UNKNOWN.p_partkey,UNKNOWN.p_mfgr,UNKNOWN.s_address,UNKNOWN.s_phone,UNKNOWN.s_comment,UNKNOWN.ps_supplycost |
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
2.6 sql_export_tables
函數調用形式：
- sql_export_tables(sqlText)
- sql_export_tables(sqlText, dbType)
- sql_export_tables(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | sqlText的SQL語句中全部出現的表名，用逗號分隔 |
示例：
SELECT sql_export_tables(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+--------------------------------------+
| sql_export_tables(a.sql_text) |
+--------------------------------------+
| part,supplier,partsupp,nation,region |
+--------------------------------------+
2.7 sql_format
函數調用形式：
- sql_format(sqlText)
- sql_format(sqlText, dbType)
- sql_format(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | 格式化sqlText的SQL語句 |
示例：
SELECT sql_format(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sql_format(a.sql_text) |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| SELECT s_acctbal, s_name, n_name, p_partkey, p_mfgr
, s_address, s_phone, s_comment
FROM part, supplier, partsupp, nation, region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE '%NICKEL'
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = 'MIDDLE EAST'
AND ps_supplycost IN (
SELECT min(ps_supplycost)
FROM partsupp, supplier, nation, region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = 'MIDDLE EAST'
)
ORDER BY s_acctbal DESC, n_name, s_name, p_partkey
LIMIT 100; |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2.8 sql_params
函數調用形式：
- sql_params(sqlText)
- sql_params(sqlText, dbType)
- sql_params(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | 提取sqlText的SQL語句中的literal值 |
示例：
SELECT sql_params(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+------------------------------------------------+
| sql_params(a.sql_text) |
+------------------------------------------------+
| [35,"%NICKEL","MIDDLE EAST","MIDDLE EAST",100] |
+------------------------------------------------+
2.10 sql_pattern
函數調用形式：
- sql_pattern(sqlText)
- sql_pattern(sqlText, dbType)
- sql_pattern(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | 提取sqlText的SQL語句參數化後的SQL pattern, literal值換成? |
示例：
SELECT sql_pattern(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sql_pattern(a.sql_text) |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| SELECT s_acctbal, s_name, n_name, p_partkey, p_mfgr
, s_address, s_phone, s_comment
FROM part, supplier, partsupp, nation, region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = ?
AND p_type LIKE ?
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ?
AND ps_supplycost IN (
SELECT min(ps_supplycost)
FROM partsupp, supplier, nation, region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ?
)
ORDER BY s_acctbal DESC, n_name, s_name, p_partkey
LIMIT ?; |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2.11 sql_pattern_hash
函數調用形式：
- sql_pattern_hash(sqlText)
- sql_pattern_hash(sqlText, dbType)
- sql_pattern_hash(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| VARCHAR | 提取sqlText的SQL語句參數化後的SQL pattern，並生成hash值 |
示例：
SELECT sql_pattern_hash(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+------------------------------+
| sql_pattern_hash(a.sql_text) |
+------------------------------+
| 925870115679910184 |
+------------------------------+
2.12 sql_syntax_check
函數調用形式：
- sql_syntax_check(sqlText)
- sql_syntax_check(sqlText, dbType)
- sql_syntax_check(sqlText, dbType, throwError)
參數說明：
| 參數名 | 類型 | 說明 |
|---|---|---|
| sqlText | VARCHAR | 必選 |
| dbType | VARCHAR | 可選。SQL方言，默認爲mysql |
| throwError | BOOLEAN | 可選。true時，遇到非法SQL拋出異常；false時，遇到非法SQL不拋出異常，返回null |
返回值:
| 類型 | 說明 |
|---|---|
| BOOLEAN | 對sqlText進行語法檢查，1表示正確，0表示錯誤 |
示例：
SELECT sql_syntax_check(a.sql_text)
FROM (
SELECT 'SELECT s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM part,
supplier,
partsupp,
nation,
region
WHERE p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 35
AND p_type LIKE ''%NICKEL''
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST''
AND ps_supplycost IN
(
SELECT min(ps_supplycost)
FROM partsupp,
supplier,
nation,
region
WHERE s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = ''MIDDLE EAST'' )
ORDER BY s_acctbal DESC,
n_name,
s_name,
p_partkey
LIMIT 100;' AS sql_text
) a;
+------------------------------+
| sql_syntax_check(a.sql_text) |
+------------------------------+
| 1 |
+------------------------------+
本文做者：julian.zhou
本文爲雲棲社區原創內容，未經容許不得轉載。
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