Question

我有以下MySQL查询显示声音，但当一个变量为空时不会更新表

$stmtEmploymentDetails = getDB()->prepare(
    'UPDATE EmploymentDetails SET BranchOffice=?, EmploymentDate=?, EmploymentStatus=?, EmploymentType=?, OrdinaryHours=?, JobClassification=?, ManagmentGroupID=? WHERE EmployeeID=?'
);

和绑定参数

$stmtEmploymentDetails->bind_param(
    'ssiiisss',
    $branchOffice,
    $employmentDate,
    $employmentStatus,
    $employmentType,
    $ordinaryHours,
    $jobClassification,
    $managmentGroupID,
    $employeeID
);

$stmtEmploymentDetails->execute;

我也试过使用COALESCE，但是值（我假设）是空的而不是空

$stmtEmploymentDetails = getDB()->prepare(
    'UPDATE EmploymentDetails SET BranchOffice=COALESCE(BranchOffice=?, BranchOffice), EmploymentDate=COALESCE(EmploymentDate=?, EmploymentDate), EmploymentStatus=COALESCE(EmploymentStatus=?, EmploymentStatus), EmploymentType=COALESCE(EmploymentType=?, EmploymentType), OrdinaryHours=COALESCE(OrdinaryHours=?, OrdinaryHours), JobClassification=COALESCE(JobClassification=?, JobClassification), ManagmentGroupID=COALESCE(ManagmentGroupID=?, ManagmentGroupID) WHERE EmployeeID=?'
);

使用

进行较小的查询时，同样的方法也没有任何问题

$stmtEmployeeProfile = getDB()->prepare(
    'UPDATE EmployeeProfiles SET AKAName=? WHERE EmployeeID=?'
);

和

$stmtEmployeeProfile->bind_param(
    'ss',
    $AKAName,
    $employeeID
);

$stmtEmployeeProfile->execute();

但在该查询中，始终提供值。谁知道问题出在哪里？

Answer 1

您是否在查询周围放置了任何错误报告以查看实际发生的情况？

if ($stmtEmploymentDetails = getDB()->prepare(
'UPDATE EmploymentDetails 
 SET BranchOffice=?, EmploymentDate=?, 
 EmploymentStatus=?, EmploymentType=?, 
 OrdinaryHours=?, 
 JobClassification=?, 
 ManagmentGroupID=? 
 WHERE EmployeeID=?')) { 
    $stmtEmploymentDetails->execute(); 
 } else {
 echo "Failed prepare statement" . $this->conn->error . $this->conn->error;
 }

我希望有一点帮助，当你有这个错误然后工作。可能是拼写问题，或者您没有对值为空的正确检查。这样做的方法是一个简单的isset（）语句，例如。

if (isset($stmtEmplotmentDetails)) {
// do something 
} else {
$stmtEmplotmentDetails = 0; // or default value e.g. "N/A"
}

另外考虑一下，如果你检查数据类型是否正确与数据库相互矛盾，你的绑定参数查询中有字符串和整数。它们是否与数据库中的数据类型匹配？

MySQLi bind_param UPDATE不使用空值

1 个答案: