return @row_number := @row_number + 1; -- 带复位的写法 CREATE FUNCTION func_row_num(reset bit) RETURNS int(11) begin if reset then set @row_num := 0; else set @row_num := ifnull(@row_num, 0) + 1; end if; return @row_num; end 1. 2. 3. 4. 5. 6. 7. 8. 9. 1...
return $this->db->prepare($sql); } function affected_rows() { return $this->db->affected_rows; } function error() { return $this->db->error; } function errno() { return $this->db->errno; } //result 没有 function num_rows($query) { return $query->num_rows; } //返回值 int...
无论何种数据库，从官方网站获取帮助是最直接最有效的方式。其次没有网络的环境下，我们可以通过MySQL客户...
...执行的程序代码 return 数据; end; 例子: delimiter $$; create FUNCTION get_stuid(s_name varchar(20)) RETURNS int begin declare num int; select id from students where name=s_name into num; return num; end $$; delimiter ; 调用select get_stuid('aaa'); 六、触发器 触发器(TRIGGER)是...
我刚刚注意到,mysql_num_rows应该返回SELECT或SHOW命令返回的行数,而SHOW TABLE命令专门返回0。相反,它会显示受影响的行数,而不是行数。 浏览2提问于2013-01-24得票数 1 2回答 MySQL:如果唯一字段已用于INSERT INTO,如何执行操作 、、、 我使用MySQL语句INSERT INTO将数据插入到我的表中。我有几个独特的字段...
int mysql_num_rows (MYSQL_RES *res) 返回结果集的行数 unsigned int mysql_field_count(MYSQL *mysql) 返回结果集中行的列数 unsigned int mysql_num_fields(MYSQL_RES *res) 同上。 MYSQL_ROW mysql_fetch_row(MYSQL_RES *res) 从结果集中取得下一行,返回下一行的MYSQL_ROW结构。如果没有更多的行可检索...
numRows = mysql_num_rows(mysqlResult); //numFields = mysql_field_count(conn); numFields = mysql_num_fields(mysqlResult); printf("Number of rows=%u Number of fields=%u \n",numRows,numFields); } else { printf("no results\n"); Results in the following output: Number of ...
$result = $conn->query($sql);// 输出查询结果if ($result->num_rows > 0) {while($row = $result->fetch_assoc()) {echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "";}} else {echo "0 结果";}// 关闭连接$conn->close();?
andrey@example.com +16 -0 Fix forbug#21818"Return value of ROW_COUNT() is incorrect for ALTER TABLE, LOAD DATA" This patch refactores the server code so the only place, where the affected number of rows of the last statement is stored, is THD::row_count_func This patch includes a ...
If row holds the return value from a call to mysql_fetch_row(), pointers to the values are accessed as row[0] to row[mysql_num_fields(result)-1]. NULL values in the row are indicated by NULL pointers. The lengths of the field values in the row may be obtained by calling mysql_...