MySQL数据库函数详解(4)

(16) int mysql_field_seek(int result, int field_offset);

为随后的mysql_fetch_field()调用设置索引。发布没有明确列号的mysql_fetch_field()的下一次调用，将返回列col_num的信息。如果搜索成功，返回真，否则返回假。

$query="SELECT * FROM president";

$result=mysql_query($query) or die("Query failed");

for($i=0;$i

{

printf("Information for column %d:

",$i);

if(!mysql_field_seek($result,$i))

{

print("Cannot seek to colum

");

continue;

}

$meta=mysql_fetch_field($result,$i);

if(!$meta)

{

print("No information available

");

continue;

}

print("

");
printf("blob: %s
",$meta->blob);
printf("max_length: %s
",$meta->max_length);
printf("multiple_key: %s
",$meta->multiple_key);
printf("name: %s
",$meta->name);
printf("not_null: %s
",$meta->not_null);
printf("numeric: %s
",$meta->numeric);
printf("primary_key: %s
",$meta->primary_key);
printf("table: %s
",$meta->table);
printf("type: %s
",$meta->type);
printf("unique_key: %s
",$meta->unique_key);
printf("unsigned: %s
",$meta->unsigned);
printf("zerofill: %s
",$meta->zerofill);
print("

");

}

>

(17) string mysql_field_table(int result_id, int col_num);

返回结果集给定列的表名。对于计算列，此名为空。

< php

$link=mysql_pconnect("localhost","sunsoft","suixiang")

(20) int mysql_field_len(int result, int field_offset);

返回结果集给定列中值可能的最大长度。