为什么我在准备好的语句中收到'mysqli_stmt::bind_param(): 字符计数和绑定变量不匹配”错误？-mysql教程-PHP中文网

Why am I getting the

mysqli_stmt::bind_param(): 字符计数和绑定变量不匹配

当尝试使用 mysqli 预准备语句将数据插入数据库时，您可能会遇到以下错误“类型定义字符串中的元素数量与绑定变量的数量不匹配。”当 SQL 查询中的占位符标记 (?) 数量与传递给 bind_param 的类型定义字符串中的字符数不匹配时，就会出现此错误。

在提供的示例中，有 65 个占位符查询中的标记和传递给 bind_param 的 65 个变量。但是，代码片段中没有指定类型定义字符串，因此无法验证字符数是否与绑定变量的数量匹配。

类型定义字符串必须包含与占位符相同的字符数在SQL查询中，其中每个字符代表相应占位符的数据类型。例如，在具有三个占位符的 SQL 查询中，bind_param 需要具有三个字符的类型定义字符串，例如“sss”，以指示所有三个占位符都是字符串。

要解决该错误，请确保：

SQL 查询包含正确数量的占位符标记。
提供给 bind_param 的类型定义字符串与占位符标记的数量，并为每个占位符指定正确的数据类型。

以下是包含类型定义字符串的更正示例：

// Preparing our query statement via mysqli which will auto-escape all bad characters to prevent injection
$query3 = 'INSERT INTO datashep_AMS.COMPLETE_APPLICATIONS (
    project_name,
    status,
    funding_requested,
    project_title,
    program,
    county,
    parish,
    name_of_watercourse,
    which_is_a_tributary_of,
    name_of_applicant,
    contact_person_or_project_supervisor,
    relationship_to_organization,
    business_phone,
    home_phone,
    email,
    signature_of_thesis_or_study_supervisor,
    mailing_address,
    postal_code,
    website,
    mailing_address_for_payment,
    hst_registration_no,
    total_cost_dollar,
    total_cost_percent,
    dollar_amount_requested_from_nbwtf,
    percent_amount_requested_from_nbwtf,
    descriptive_summary,
    background_of_organization,
    mandate,
    years_in_existence,
    membership,
    accomplishments,
    previous_project_name,
    previous_project_number,
    previous_project_amount_received_from_nbwtf,
    summary_of_activities,
    summary_of_Results,
    project_title_2,
    reason_and_or_purpose,
    objectives,
    project_description,
    methods,
    equipment_and_materials_required,
    personnel_required,
    proposed_start_date,
    proposed_end_date,
    type_of_data_to_be_stored,
    where_will_it_be_housed,
    monitoring,
    short_term_achievement,
    long_term_achievement,
    previous_studies,
    required_permits,
    consultants,
    short_term_commitment,
    long_term_commitment,
    project_duration,
    project_evaluation,
    promotion_of_project,
    promotion_of_client,
    publication_of_results,
    community_benefits,
    effects_on_traditional_uses,
    possible_changes_in_public_access_to_areas,
    possible_impact_on_wildlife_and_or_environment,
    likelihood_of_future_requests_for_funding,
    list_all_other_funding_sources_for_this_project
) VALUES (
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)';

// "Preparing" the query using mysqli->prepare(query) -- which is the equivalent of mysql_real_escape_string -- in other words, it's the SAFE database injection method
$stmt = $dbConnection->prepare($query3);

// "Bind_param" == replace all the "?"'s in the aforementioned query with the variables below

$stmt->bind_param(
    "ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss", 
    $project_name, $status, $funding_requested, $project_title, $program, $county, $parish, $name_of_watercourse, $which_is_a_tributary_of, 
    $name_of_applicant, $contact_person_or_project_supervisor, $relationship_to_organization, $business_phone, $home_phone, $email, 
    $signature_of_thesis_or_study_supervisor, $mailing_address, $postal_code, $website, $mailing_address_for_payment, $hst_registration_no, 
    $total_cost_dollar, $total_cost_percent, $dollar_amount_requested_from_nbwtf, $percent_amount_requested_from_nbwtf, $descriptive_summary, 
    $background_of_organization, $mandate, $years_in_existence, $membership, $accomplishments, $previous_project_name, $previous_project_number, 
    $previous_project_amount_received_from_nbwtf, $summary_of_activities, $summary_of_Results, $project_title_2, $reason_and_or_purpose, $objectives, 
    $project_description, $methods, $equipment_and_materials_required, $personnel_required, $proposed_start_date, $proposed_end_date, 
    $type_of_data_to_be_stored, $where_will_it_be_housed, $monitoring, $short_term_commitment, $long_term_achievement, $previous_studies, $required_permits, 
    $consultants, $short_term_commitment, $long_term_commitment, $project_duration, $project_evaluation, $promotion_of_project, $promotion_of_client, 
    $publication_of_results, $community_benefits, $effects_on_traditional_uses, $possible_changes_in_public_access_to_areas, $possible_impact_on_wildlife_and_or_environment, 
    $likelihood_of_future_requests_for_funding, $list_all_other_funding_sources_for_this_project
);

// Perform the actual query!
$stmt->execute();

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