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已解決 使用這個(gè)語(yǔ)句查詢的時(shí)候報(bào)錯(cuò)了說(shuō)對(duì)象無(wú)法轉(zhuǎn)化為字符串這個(gè)是什么
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使用這個(gè)sql語(yǔ)句查詢的時(shí)候，報(bào)錯(cuò)了，說(shuō)對(duì)象無(wú)法轉(zhuǎn)化為字符串這個(gè)是什么意思。咋解決呢，打印了sql是對(duì)的，而且再數(shù)據(jù)庫(kù)里面我也查詢過(guò)，是正確的。
$data = $this->db->query("SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA. TABLES WHERE TABLE_NAME = 'info_linkage_data_".$key."'");
這個(gè)是錯(cuò)誤日志，有人能幫我看下咋回事么
CRITICAL - 2020-02-10 00:37:37 --> Object of class CodeIgniter\Database\MySQLi\Result could not be converted to string
# http://oa.qhbjy.com/admin.php?c=mylinkage&m=list_add&key=3&pid=1
# SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'info_linkage_data_3'
#0 /www/wwwroot/message/dayrui/My/Model/Linkage.php(144): Phpcmf\Extend\Exceptions->errorHandler(4096, 'Object of class...', '/www/wwwroot/me...', 144, Array)
#1 /www/wwwroot/message/dayrui/Core/Controllers/Admin/Mylinkage.php(285): My\Model\Linkage->add_list(3, Object(CodeIgniter\Database\MySQLi\Result))
#2 /www/wwwroot/message/dayrui/System/CodeIgniter.php(847): Phpcmf\Controllers\Admin\Mylinkage->list_add()
#3 /www/wwwroot/message/dayrui/System/CodeIgniter.php(338): CodeIgniter\CodeIgniter->runController(Object(Phpcmf\Controllers\Admin\Mylinkage))
#4 /www/wwwroot/message/dayrui/System/CodeIgniter.php(246): CodeIgniter\CodeIgniter->handleRequest(NULL, Object(Config\Cache), false)
#5 /www/wwwroot/message/dayrui/Fcms/Init.php(329): CodeIgniter\CodeIgniter->run()
#6 /www/wwwroot/message/index.php(47): require('/www/wwwroot/me...')
#7 /www/wwwroot/message/admin.php(9): require('/www/wwwroot/me...')
#8 {main}
$data = $this->db->query("SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA. TABLES WHERE TABLE_NAME = 'info_linkage_data_".$key."'"); foreach ($data->getResultArray() as $da){ echo $da['AUTO_INCREMENT']; }要這樣寫(xiě)