根据@variable，根据IF条件执行不同的WHERE语句？

Posted 2023-02-26

【中文标题】根据@variable，根据IF条件执行不同的WHERE语句？

【英文标题】：Execute different WHERE statement based on IF conditions depending on @variable?

【发布时间】：2021-02-17 05:44:04

【问题描述】：

我的 Spring Boot 应用程序中的 DAO 层中有一个 nativeQuery。

基本上，我传递三个参数，如下所示：

@Query(name = "findInvoicesTour", nativeQuery = true)
    List<InvoiceDto> findInvoices(@Param("invoiceNumber") String invoiceNumber, @Param("companyName") String companyName, @Param("paid") boolean paid);

我希望根据companyName 的值执行不同的 WHERE 语句，如下所示：

if(:companyName = '')
    SELECT col1, col2, col3
    FROM invoice_tour it
    WHERE it.paid =: paid AND it.invoice_number LIKE :invoiceNumber
ELSE
    SELECT col1, col2, col3
    FROM invoice_tour it
    WHERE it.paid =: paid AND it.invoice_number LIKE :invoiceNumber AND it.companyName := companyName

或者

SELECT col1, col2, col3
 if(:companyName = '')
        FROM invoice_tour it
        WHERE it.paid =: paid AND it.invoice_number LIKE :invoiceNumber
 ELSE
        FROM invoice_tour it
        WHERE it.paid =: paid AND it.invoice_number LIKE :invoiceNumber AND it.companyName := companyName

【参考方案1】：

使用布尔逻辑：

SELECT col1, col2, col3
FROM invoice_tour it
WHERE 
    it.paid =: paid 
    AND it.invoice_number LIKE :invoiceNumber
    AND (:companyName = '' OR it.companyName := companyName)