如何在雪花存储过程中动态创建 sql 时转义单引号？

Question

 CREATE OR REPLACE PROCEDURE DEPARTMENT_STORED_PROC(table_name VARCHAR)
    returns variant not null
    
    language javascript
    as
    $$    
    
    var sql_cmd_ingest = "copy into DEPARTMENT.CLASSES." + TABLE_NAME + "from '@DEPARTMENT.CLASSES.CLASSES_PREPROD_STAGE/" + TABLE_NAME + "';";
        snowflake.execute({sqlText: sql_cmd_ingest} );
$$

以上只是一个代码片段。我在 '@DEPARTMENT.CLASSES.CLASSES_PREPROD_STAGE/"

之前收到单引号错误

Execution error in store procedure DEPARTMENT_STORED_PROC: SQL compilation error: syntax error line 1 at position 70 unexpected ''@DEPARTMENT.CLASSES.CLASSES_PREPROD_STAGE/CLASSES_TABLE''. At Snowflake.execute, line 11 position 10

Answer 1

您需要在 TABLE_NAME 之后和“from

之前添加一个 space

var sql_cmd_ingest = "copy into DEPARTMENT.CLASSES." + TABLE_NAME + " from '@DEPARTMENT.CLASSES.CLASSES_PREPROD_STAGE/" + TABLE_NAME + "';";

此外，我强烈建议在存储过程中构建 SQL 语句时使用 JavaScript 替换变量。您可以使用三种不同类型的引号来定义 JavaScript、double " single ' 和 back tick `.

中的字符串

如果您使用反引号来开始和结束您的字符串，那么您可以在该字符串中使用任何 JavaScript 变量，而无需终止字符串并用 + 连接。例如：

var sql_cmd_ingest = `copy into DEPARTMENT.CLASSES.${TABLE_NAME} from '@DEPARTMENT.CLASSES.CLASSES_PREPROD_STAGE/${TABLE_NAME}';`;

它使 SQL 更具可读性，尤其是当 SQL 很长且多行时。

此外，舞台名称不应在 SQL 中用引号引起来。你应该删除它们：

var sql_cmd_ingest = `copy into DEPARTMENT.CLASSES.${TABLE_NAME} from 
 @DEPARTMENT.CLASSES.CLASSES_PREPROD_STAGE/${TABLE_NAME};`;

如何在雪花存储过程中动态创建 sql 时转义单引号？

How to escape single quote while dynamically creating sql in a snowflake stored procedure?

dynamic-sql

snowflake-cloud-data-platform