[转载]PHP中的MYSQL常用函数总结 (二)
16、mysql_list_tables()-获取数据库表列表
格式:
resource mysql_list_tables(string database [, resource link_id])
例:
mysql_connect("localhost", "username", "password");
$tables = mysql_list_tables("MyDatabase");
while (list($table) = mysql_fetch_row($tables)) {
echo "$table <br />";
}
说明:该函数获取database中所有表的表名
17、mysql_tablename()-获取某个数据库表名
格式:
string mysql_tablename(resource result_set, integer index)
例:
mysql_connect("localhost", "username", "password");
$tables = mysql_list_tables("MyDatabase");
$count = -1;
while (++$count < mysql_numrows($tables)) {
echo mysql_tablename($tables, $count)."<br />";
}
说明:该函数获取mysql_list_tables()所返回result_set中位于指定index索引的表名
18、mysql_fetch_field()-获取字段信息
格式:
object mysql_fetch_field(resource result [, int field_offset])
例:
mysql_connect("localhost", "username", "password");
mysql_select_db("MyDatabase");
$query = "select * from MyTable";
$result = mysql_query($query);
$counts = mysql_num_fields($result);
for($count = 0; $count < $counts; $count++) {
$field = mysql_fetch_field($result, $count);
echo "<p>$field->name $field->type ($field->max_length) </p>";
}
说明:
返回的对象共有12个对象属性:
name: 字段名
table: 字段所在的表
max_length:字段的最大长度
not_null: 如果字段不能为null,则为1,否则0
primary_key: 如果字段为主键,则为1,否则0
unique_key: 如果字段是唯一键,则为1, 否则0
multiple_key: 如果字段为非唯一,则为1,否则0
numeric: 如果字段为数值则为1,否则0
blob: 如果字段为BLOB则为1,否则为0
type: 字段的数据类型
unsigned: 如果字段为无符号数则为1,否则为0
zerofill: 如果字段为“零填充”则为1, 否则为0
19、mysql_num_fields()-获取查询的字段个数
格式:
integer mysql_num_fields(resource result_set)
例:
$query = "select id,name from MyTable order by name";
$result = mysql_query($query);
echo "这个查询的字段数是:".mysql_num_fields($result)."<br />";
20、mysql_list_fields()-获取指定表的所有字段的字段名
格式:
resource mysql_list_fields (string database_name, string table_name [, resource link_id])
例:
$fields =mysql_list_fields("MyDatabase", "MyTable");
echo "数据库MyDatabase中表MyTable的字段数: ".mysql_num_fields($fields)."<br />";
21、mysql_field_flags()-获取指定的字段选项
格式:
string mysql_field_flags (resource result_set, integer field_offset)
例:
$query = "select id, name from MyTable order by name";
$result = mysql_query($query);
$row=mysql_fetch_wor($row);
22、mysql_field_len()-获取指定的字段的最大长度
格式:
integer mysql_field_len (resource result_set, integer field_offset)
例:
$query = "select name from MyTable";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_len($result, 0)."<br />";
说明:
如果mysql_field_len($reseult, 0) = 16777215
那么numer_format(mysql_field_len($result))等于16,777,215
23、mysql_field_name()-获取字段名
格式:
string mysql_field_name (resource result_set, int field_offset)
例:
$query = "select id as PKID, name from MyTable order by name";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_name($result, 0); // Result: PKID
24、mysql_field_type()-获取字段类型
格式:
string mysql_field_type (resource result_set, int field_offset)
例:
$query = "select id, name from MyTable order by name";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_type($result, 0); // Result: int
25、mysql_field_table()-获取字段所在表名
格式:
string mysql_field_table (resource result_set, int field_offset)
例:
$query = "select id as PKID, name from MyTable order by name";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_table($result, 0); // Result: MyTable
格式:
resource mysql_list_tables(string database [, resource link_id])
例:
mysql_connect("localhost", "username", "password");
$tables = mysql_list_tables("MyDatabase");
while (list($table) = mysql_fetch_row($tables)) {
echo "$table <br />";
}
说明:该函数获取database中所有表的表名
17、mysql_tablename()-获取某个数据库表名
格式:
string mysql_tablename(resource result_set, integer index)
例:
mysql_connect("localhost", "username", "password");
$tables = mysql_list_tables("MyDatabase");
$count = -1;
while (++$count < mysql_numrows($tables)) {
echo mysql_tablename($tables, $count)."<br />";
}
说明:该函数获取mysql_list_tables()所返回result_set中位于指定index索引的表名
18、mysql_fetch_field()-获取字段信息
格式:
object mysql_fetch_field(resource result [, int field_offset])
例:
mysql_connect("localhost", "username", "password");
mysql_select_db("MyDatabase");
$query = "select * from MyTable";
$result = mysql_query($query);
$counts = mysql_num_fields($result);
for($count = 0; $count < $counts; $count++) {
$field = mysql_fetch_field($result, $count);
echo "<p>$field->name $field->type ($field->max_length) </p>";
}
说明:
返回的对象共有12个对象属性:
name: 字段名
table: 字段所在的表
max_length:字段的最大长度
not_null: 如果字段不能为null,则为1,否则0
primary_key: 如果字段为主键,则为1,否则0
unique_key: 如果字段是唯一键,则为1, 否则0
multiple_key: 如果字段为非唯一,则为1,否则0
numeric: 如果字段为数值则为1,否则0
blob: 如果字段为BLOB则为1,否则为0
type: 字段的数据类型
unsigned: 如果字段为无符号数则为1,否则为0
zerofill: 如果字段为“零填充”则为1, 否则为0
19、mysql_num_fields()-获取查询的字段个数
格式:
integer mysql_num_fields(resource result_set)
例:
$query = "select id,name from MyTable order by name";
$result = mysql_query($query);
echo "这个查询的字段数是:".mysql_num_fields($result)."<br />";
20、mysql_list_fields()-获取指定表的所有字段的字段名
格式:
resource mysql_list_fields (string database_name, string table_name [, resource link_id])
例:
$fields =mysql_list_fields("MyDatabase", "MyTable");
echo "数据库MyDatabase中表MyTable的字段数: ".mysql_num_fields($fields)."<br />";
21、mysql_field_flags()-获取指定的字段选项
格式:
string mysql_field_flags (resource result_set, integer field_offset)
例:
$query = "select id, name from MyTable order by name";
$result = mysql_query($query);
$row=mysql_fetch_wor($row);
22、mysql_field_len()-获取指定的字段的最大长度
格式:
integer mysql_field_len (resource result_set, integer field_offset)
例:
$query = "select name from MyTable";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_len($result, 0)."<br />";
说明:
如果mysql_field_len($reseult, 0) = 16777215
那么numer_format(mysql_field_len($result))等于16,777,215
23、mysql_field_name()-获取字段名
格式:
string mysql_field_name (resource result_set, int field_offset)
例:
$query = "select id as PKID, name from MyTable order by name";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_name($result, 0); // Result: PKID
24、mysql_field_type()-获取字段类型
格式:
string mysql_field_type (resource result_set, int field_offset)
例:
$query = "select id, name from MyTable order by name";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_type($result, 0); // Result: int
25、mysql_field_table()-获取字段所在表名
格式:
string mysql_field_table (resource result_set, int field_offset)
例:
$query = "select id as PKID, name from MyTable order by name";
$result = mysql_query($query);
$row = mysql_fetch_row($result);
echo mysql_field_table($result, 0); // Result: MyTable