I can select all tables in a database like this
$tables = array();
$result = mysql_query('SHOW TABLES');
while($row = mysql_fetch_row($result))
{
$tables[] = $row[0];
}
And following code populate $return variable which can be used to backup the database.
foreach($tables as $table)
{
$result = mysql_query('SELECT * FROM '.$table);
$num_fields = mysql_num_fields($result);
$return.= 'DROP TABLE IF EXISTS '.$table.';';
$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
$return.= "\n\n".$row2[1].";\n\n";
for ($i = 0; $i < $num_fields; $i++)
{
while($row = mysql_fetch_row($result))
{
$return.= 'INSERT INTO '.$table.' VALUES(';
for($j=0; $j<$num_fields; $j++)
{
$row[$j] = addslashes($row[$j]);
$row[$j] = ereg_replace("\n","\\n",$row[$j]);
if (isset($row[$j])) { $return.= '"'.$row[$j].'"' ; } else { $return.= '""'; }
if ($j<($num_fields-1)) { $return.= ','; }
}
$return.= ");\n";
}
}
$return.="\n\n\n";
}
My database has two mysql views. Above code generates "INSERT INTO...." string even for mysql views which I need to avoid. So before starting the 'for loop' to generate "INSERT INTO.." values I need to check if $table is actually a mysql table or view. How to identify whether a name refers to mysql table or mysql view?
SHOW [FULL] TABLES
The FULL
modifier is supported such that SHOW FULL TABLES
displays a second output column. Values for the second column are BASE TABLE
for a table and VIEW
for a view.
您可以使用命令SHOW FULL TABLES
,它将添加第二列,显示关系是BASE TABLE
还是VIEW
。
If I understand you correctly, you want to know how to detect whether a table/view exists. If so, the following should help. I have written a wrapper class for PDO and this statement has been taken from the tables_exists()
method:
SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = :database AND TABLE_NAME = :table
The above query can be altered very easily to determine whether a view exists as well.
Please do not use the mysql_*
API as these functions are now deprecated. Instead, you should use either PDO or mysqli. See the following links:
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