mysqli_fetch_field() 函数从结果集中取得下一字段(列),并作为对象返回。语法mysqli_fetch_field(result); 参数描述 result 必需。规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。技术细节返回值: 返回包含字段定义信息
mysql_fetch_field() 返回的字段也受 mysql_field_seek() 调用的影响。如果已经调用 mysql_real_query() 或mysql_query() 对表执行 SELECT, 但没有调用 mysql_store_result(),在这种情况下,调用 mysql_fetch_field() 询问BLOB 的长度时,OceanBase 将返回 BLOB 字段的默认长度 (8 KB)。
PHP mysqli_fetch_field_direct() 函数 PHP MySQLi 参考手册 返回结果集中某个单一字段(列)的 meta-data,并输出字段名称、表格和最大长度: 定义和用法 mysqli_fetch_field_direct() 函数从结果集中取得某个单一字段(列)的 meta-data,并作为对象返回。 语法 m
*field;while((field=mysql_fetch_field(result))){printf("field name %s\n",field->name);}
这里的fieldnr是一个整数，它代表字段在结果集中从0开始的索引，其范围应该在0到mysql_num_fields(result)减1之间，其中mysql_num_fields(result)表示结果集中列的数量。通过调用mysql_fetch_field_direct，你可以针对任意列获取其字段类型、名称、长度、是否可为空等属性信息。这个函数执行时，如果指定的...
MYSQL_FIELD * mysql_fetch_field(MYSQL_RES * result); result - a result set identifier returned by mysql_store_result() or mysql_use_result(). Description Returns the definition of one column of a result set as a pointer to a MYSQL_FIELD structure. Call this function repeatedly to retr...
MYSQL_FIELD * mysql_fetch_field_direct(MYSQL_RES * res, unsigned int fieldnr); res - a result set identifier returned by mysql_store_result() or mysql_use_result(). fieldnr - the field number. This value must be within the range from 0 to number of fields - 1 Description Return...
TheMYSQL_FIELDstructure for the specified column. Errors None. Example unsignedintnum_fields;unsignedinti;MYSQL_FIELD*field;num_fields=mysql_num_fields(result);for(i=0;i<num_fields;i++){field=mysql_fetch_field_direct(result,i);printf("Field %u is %s\n",i,field->name);}...
die('Query failed: '.mysql_error()); } /* get column metadata */ $i=0; while ($i<mysql_num_fields($result)) { echo"Information for column$i:\n"; $meta=mysql_fetch_field($result,$i); if (!$meta) { echo"No information available\n"; } echo" blob:$...
[15:45:07.676] at com.caucho.quercus.lib.QuercusMysqlModule.mysql_fetch_field(QuercusMysqlModule.java:362) [15:45:07.676] at _quercus._wp_22dincludes._wp_22ddb__php$quercus_wpdb.fun_query(_wp_22ddb__php.java:572) [15:45:07.676] at _quercus._wp_22dincludes._wp_22ddb__php$quercus...