phpl determines whether the data table in the mysq database exists

This article mainly shares with you how to use phpl to determine whether the data table in the mysq database exists. There are two main ways. I hope it can help everyone.

Note: The following are all tested in the ThinkPHP framework

Method 1

By querying MySQL configuration table information

//TABLE_SCHEMA：表示数据库名 ， TABLE_NAME : 表示表名  
$sql = "SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='database_name' and TABLE_NAME = 'table_name'";   
$model = new \Think\Model();  
$res = $model->query($sql);
$isExist = $res[0];

Method 2

Query all data tables in the specified data, and then compare whether the queried data table exists

//检测表是否存在
function tableExist($tableName){
    if(empty($tableName)) return false;
    $tableName = C('DB_PREFIX').$tableName;
    $model = new \Think\Model();
    $tableArr = $model->query('SHOW TABLES');
    $_fName = 'tables_in_'.C('DB_NAME');
    return in_array($tableName, array_column($tableArr, $_fName));
}

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