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(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。
col_num的范围为0到mysql_num_fields()-1.
<?php
$link=mysql_pconnect("localhost","sunsoft","suixiang")
or die("Could not connect");
mysql_select_db("stamp_db") or die("Could not select database");
$query="SELECT * FROM president";
$result=mysql_query($query) or die("Query failed");
for($i=0;$i<mysql_num_fields($result);$i++)
{
printf("Information for column %d:<BR>
",$i);
if(!mysql_field_seek($result,$i))
{
print("Cannot seek to colum<BR>
数据挖掘工具
");
continue;
}
$meta=mysql_fetch_field($result,$i);
if(!$meta)
{
print("No information available<BR>
");
continue;
}
print("<PRE>
");
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("</PRE>
");
}
数据挖掘交友
?>
(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。
col_num的范围为0到mysql_num_fields()-1.
<?php
$link=mysql_pconnect("localhost","sunsoft","suixiang")
or die("Could not connect");
mysql_select_db("stamp_db");
$query="SELECT * FROM president";
$result=mysql_query($query) or die("Query failed");
for($i=0;$i<mysql_num_fields($result);$i++)
{
print("column $d:",$i);
printf("Name %s
",mysql_field_name($result,$i));
printf("Table %s
",mysql_field_nmae($result,$i));
print"<BR>
";
?>
(18) string mysql_field_type(int result_id, int col_num);
返回结果集给定列的类型名。类型名敬请等待参考本人的另外“MySQL列类型参考”。
col_num的范围为0到mysql_num_fields()-1.
<?php
$link=pconnect("localhost","sunsoft","suixiang") 数据挖掘实验室
or die("Could not connect");
mysql_select_db("stamp_db");
$query="SELECT * FROM president";
$result=mysql_query($query) or die("Query failed");
for($i=0;$i<mysql_num_fields($result);$i++)
{
printf("colum %d:",$i);
printf("Name %s,
",mysql_field_name($result,$i));
printf("Type %s
",mysql_field_type($result,$i));
}
?>
(19) string mysql_field_flags(int result_id, int col_num);
作为字符串返回结果集中给定列的相关元数据信息，如果出现错误，则返回假。这个字符串由以空格分开的词组成，说明哪个列的标记值为真。对于假的标记，在字符串中给出相应的词。
col_num的范围为0到mysql_num_fields()-1.
<?php
$link=mysql_pconnect("localhost","sunsoft","suixiang")
or die("Could not connect");
mysql_select_db("stamp_db");
$query="SELECT * FORM member";
$result=mysql_query($query) or die("Query failed");
for($i=0;$i<mysql_num_fields($result);$i++)
{
printf("column %d:",$i);
printf("Name %s,
",mysql_fields_name($result,$i));
printf("Flags %s
",mysql_fields_flags($result,$i));
}
?>
(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。
col_num的范围为0到mysql_num_fields()-1.
<?php
$link=mysql_pconnect("localhost","sunsoft","suixiang")
or die("Could not connect");
mysql_select_db("stamp_db");
$query="SELECT * FROM member";
$result=mysql_query($query) or die("Query failed");
for($i=0;$i<mysql_num_fields($result);$i++)
{
printf("Column %d:",$i);
printf("Name %s,
",mysql_field_name($result,$i));
printf("Len %d
",mysql_field_len($result,$i));
print"<BR>
";
}
?>
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