Sample Code - MySQL

The purpose of this article is to describe the methods used to create the database copying tool, and outline features of the technologies used in its creation. Specifically, focusing on the following topics: MySQL permissions for remote connections; PHP support for simultaneous connections to multiple databases; building dynamic INSERT and CREATE TABLE statements with PHP.

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By: Stephen Junker

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May 07, 2001

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<?
//  #!/usr/local/bin/php  (put this line as first line for Interland)
if (empty($phase)) {
setcookie("srcHost", "");
setcookie("srcDB", "");
setcookie("srcUname", "");
setcookie("srcPass", "");
setcookie("tgtHost", "");
setcookie("tgtDB", "");
setcookie("tgtUname", "");
setcookie("tgtPass", "");
}
if ($phase == "setHost") {
setcookie("srcHost", $srcHost);
setcookie("srcDB", $srcDB);
setcookie("srcUname", $srcUname);
setcookie("srcPass", $srcPass);
setcookie("tgtHost", $tgtHost);
setcookie("tgtDB", $tgtDB);
setcookie("tgtUname", $tgtUname);
setcookie("tgtPass", $tgtPass);
}
?>
<HTML>
<HEAD>
<TITLE>Remote Database Copier</TITLE>
</HEAD>
<BODY>
<?
if (empty($phase)) {
?>
<FORM method="post" action="<? echo $SCRIPT_NAME; ?>">
<TABLE border=0 cellpadding=5 cellspacing=0>
<TR><TD colspan=2><B>Source:</B></TD></TR>
<TR><TD>Hostname:</TD><TD><INPUT NAME="srcHost" TYPE="text"></TD></TR>
<TR><TD>Database:</TD><TD><INPUT NAME="srcDB" TYPE="text"></TD></TR>
<TR><TD>Username:</TD><TD><INPUT NAME="srcUname" TYPE="text"></TD></TR>
<TR><TD>Password:</TD><TD><INPUT NAME="srcPass" TYPE="password"></TD></TR>
<TR><TD colspan=2><B>Target:</B></TD></TR>
<TR><TD>Hostname:</TD><TD><INPUT NAME="tgtHost" TYPE="text"></TD></TR>
<TR><TD>Database:</TD><TD><INPUT NAME="tgtDB" TYPE="text"></TD></TR>
<TR><TD>Username:</TD><TD><INPUT NAME="tgtUname" TYPE="text"></TD></TR>
<TR><TD>Password:</TD><TD><INPUT NAME="tgtPass" TYPE="password"></TD></TR>
<TR><TD colspan=2 align=center><INPUT TYPE="submit"></TD></TR>
</TABLE>
<INPUT type="hidden" name="phase" value="setHost">
</FORM>
<?
}
if ($phase == "setHost" || $phase == "copy") {
if (!($srcCnx = mysql_connect($srcHost, $srcUname, $srcPass)))
echo "Unable to connect to $srcHost.<BR>";
if (!mysql_select_db($srcDB, $srcCnx))
echo "Unable to open database $srcDB on $srcHost.<BR>";
if (!($tgtCnx = mysql_connect($tgtHost, $tgtUname, $tgtPass)))
echo "Unable to connect to $tgtHost.<BR>";
if (!mysql_select_db($tgtDB, $tgtCnx))
echo "Unable to open database $tgtDB on $tgtHost.<BR>";
}
if ($phase == "setHost") {
if (!($srcRst = mysql_list_tables($srcDB, $srcCnx))) {
echo "Unable to get table list for $srcHost.<BR>";
echo mysql_error($srcCnx);
}
if (!($tgtRst = mysql_list_tables($tgtDB, $tgtCnx))) {
echo "Unable to get table list for $tgtHost.<BR>";
echo mysql_error($tgtCnx);
}
?>
<FORM method="post" action="<? echo $SCRIPT_NAME; ?>">
<TABLE border=0 cellpadding=5 cellspacing=0>
<TR><TD colspan=2><B>Source: (<? echo "$srcHost : $srcDB"; ?>)</B></TD></TR>
<TR><TD>Table:</TD>
<TD><SELECT NAME="srcTable">
<?      while ($srcRow = mysql_fetch_row($srcRst))
echo "<OPTION value=\"$srcRow[0]\">$srcRow[0]</OPTION>";
?>    </SELECT></TD></TR>
<TR><TD colspan=2><B>Target: (<? echo "$tgtHost : $tgtDB"; ?>)</B></TD></TR>
<TR><TD>Table:</TD>
<TD><SELECT NAME="tgtTable">
<?      while ($tgtRow = mysql_fetch_row($tgtRst))
echo "<OPTION value=\"$tgtRow[0]\">$tgtRow[0]</OPTION>";
?>     </SELECT></TD></TR>
<TR><TD colspan=2><B>Options:</B></TD>
<TR><TD>Create Table?</TD><TD><INPUT type="checkbox" name="tgtCreate"></TD></TR>
<TR><TD>Clear Table?</TD><TD><INPUT type="checkbox" name="tgtClear"></TD></TR>
<TR><TD>Copy Data?</TD><TD><INPUT type="checkbox" name="tgtCopy" CHECKED></TD></TR>
<TR><TD>Verbose?</TD><TD><INPUT type="checkbox" name="verbose"></TD></TR>
<TR><TD colspan=2 align=center><INPUT TYPE="submit"></TD></TR>
</TABLE>
<INPUT type="hidden" name="phase" value="copy">
</FORM>
<?
mysql_free_result($srcRst);
mysql_free_result($tgtRst);
}
if ($phase == "copy") {
$srcRst = mysql_query("select * from $srcTable;", $srcCnx);
$fieldList = "";
$columns = mysql_num_fields($srcRst);
for ($i = 0; $i < $columns; $i++) {
$tempField = mysql_field_name($srcRst, $i);
$tempType = mysql_field_type($srcRst, $i);
$fieldList .= $tempField . ", ";
if ($tempType == "string")
$createSQL .= "$tempField VARCHAR (" . mysql_field_len($srcRst, $i) . "), ";
else
$createSQL .= "$tempField $tempType, ";
}
$fieldList = substr($fieldList, 0, strlen($fieldList) - 2);
$createSQL = substr($createSQL, 0, strlen($createSQL) - 2);
if ($tgtCreate) {
$createSQL = "CREATE TABLE $srcTable ( $createSQL );";
if ($verbose) echo $createSQL . "<BR>";
mysql_query($createSQL);
$tgtTable = $srcTable . "";
}
if ($tgtClear) {
mysql_query("delete from $tgtTable;", $tgtCnx);
echo "Table $tgtTable cleared.<BR>";
}
if ($tgtCopy) {
while ($srcRow = mysql_fetch_row($srcRst)) {
$insertSQL = "insert into $tgtTable ($fieldList) VALUES (";
for ($i = 0; $i < $columns; $i++) {
if ($srcRow[$i] == null)
$insertSQL .= "null, ";
else
$insertSQL .= "'" . $srcRow[$i] . "', ";
}
$insertSQL = substr($insertSQL, 0, strlen($insertSQL) - 2);
$insertSQL .= ");";
if ($verbose) echo "$insertSQL<BR>";
mysql_query($insertSQL, $tgtCnx);
}
echo "Table copied.<BR>";
}
echo "<A HREF=\"$SCRIPT_NAME?phase=setHost\">Another Table</A><BR>";
echo "<A HREF=\"$SCRIPT_NAME?phase=\">Another Database</A><BR>";
mysql_free_result($srcRst);
}
if ($phase == "setHost" || $phase == "copy") {
mysql_close($srcCnx);
mysql_close($tgtCnx);
}
?>
</BODY>
</HTML>