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PHP获取mysql数据表的字段名称和详细信息的方法,mysql字段

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Release: 2016-06-13 09:24:48
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PHP获取mysql数据表的字段名称和详细信息的方法,mysql字段

首先我们需要了解下查询MySQL数据库/表相关信息的SQL语句:

复制代码代码如下:


SHOW DATABASES //列出 MySQL Server 数据库。
SHOW TABLES [FROM db_name] //列出数据库数据表。
SHOW CREATE TABLES tbl_name //导出数据表结构。
SHOW TABLE STATUS [FROM db_name] //列出数据表及表状态信息。
SHOW COLUMNS FROM tbl_name [FROM db_name] //列出资料表字段
SHOW FIELDS FROM tbl_name [FROM db_name],DESCRIBE tbl_name [col_name]。
SHOW FULL COLUMNS FROM tbl_name [FROM db_name]//列出字段及详情
SHOW FULL FIELDS FROM tbl_name [FROM db_name] //列出字段完整属性
SHOW INDEX FROM tbl_name [FROM db_name] //列出表索引。
SHOW STATUS //列出 DB Server 状态。
SHOW VARIABLES //列出 MySQL 系统环境变量。
SHOW PROCESSLIST //列出执行命令。
SHOW GRANTS FOR user //列出某用户权限

由上述SQL语句可以看到,我们可以使用SHOW FULL COLUMNS来列出字段及详情信息,示例代码:

复制代码代码如下:


$rescolumns = mysql_query("SHOW FULL COLUMNS FROM ".TB_NAME."") ;
while($row = mysql_fetch_array($rescolumns)){
// echo '字段名称:'.$row['Field'].'-数据类型:'.$row['Type'].'-注释:'.$row['Comment'];
// echo '

';
print_r($row);
}

打印结果:

复制代码代码如下:


Array ( [0] => id [Field] => id [1] => char(2) [Type] => char(2) [2] => utf8_general_ci [Collation] => utf8_general_ci [3] => NO [Null] => NO [4] => PRI [Key] => PRI [5] => [Default] => [6] => [Extra] => [7] => select,insert,update,references [Privileges] => select,insert,update,references [8] => [Comment] => )

Array ( [0] => title [Field] => title [1] => char(50) [Type] => char(50) [2] => utf8_general_ci [Collation] => utf8_general_ci [3] => YES [Null] => YES [4] => [Key] => [5] => [Default] => [6] => [Extra] => [7] => select,insert,update,references [Privileges] => select,insert,update,references [8] => 建议存储:标题、姓名等信息 [Comment] => 建议存储:标题、姓名等信息 )

Array ( [0] => des [Field] => des [1] => varchar(255) [Type] => varchar(255) [2] => utf8_general_ci [Collation] => utf8_general_ci [3] => YES [Null] => YES [4] => [Key] => [5] => [Default] => [6] => [Extra] => [7] => select,insert,update,references [Privileges] => select,insert,update,references [8] => [Comment] => )

…………

补充说明信息:

当然你也可以通过mysql_list_fields — 列出 MySQL 结果中的字段。mysql_list_fields() 取得给定表名的信息,参数是数据库名和表名,返回一个结果指针。

但是,mysql_list_fields() 函数已过时。最好用 mysql_query() 来发出一条 SHOW COLUMNS FROM table [LIKE 'name'] 的 SQL 语句来代替。详细可参考PHP帮助文档:PHP: mysql_list_fields - Manua

PHP代码中怎查询MYSQL数据库可以得到数据表中某个字段中最大的那条记录的ID号 举例说明:见问题补充

我是这样做的测试:
create table music(
id varchar(10),
title varchar(100),
name varchar(10)
);
insert into music values('2','离别','12354');
insert into music values('15','朋友','5454');
insert into music values('161','送别','4668');

$conn=mysql_connect("localhost:3307","数据库用户名","数据库密码");
mysql_select_db("date");
$result=mysql_query("select max(id+0) max_id from music",$conn);
$field=mysql_fetch_row($result);
print_r($field);
?>
结果:Array ( [0] => 161 )
因为mysql中varchar不能用max()所以通过id+0来转换id类型从而解决这个问题 ,如果你建表时id是整数型的就可以直接用max()了。详细解释见:hb.qq.com/a/20110624/000061.htm。

php获取mysql数据库里面的所有数据表信息

mysql_query执行sql语句,show tables这些

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