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WPDB: Remove some of the complexities in ::strip_invalid_text() associated with switching character sets between queries. Instead of trying to dynamically change connection character sets, we now rely on the value of ::charset. This also fixes the case where queries were being blocked when DB_CHARSET was utf8, but the column character set was non-utf8.

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Merge of [33308] to the 4.2 branch.

Fixes #32165.


Built from https://develop.svn.wordpress.org/branches/4.2@33309


git-svn-id: http://core.svn.wordpress.org/branches/4.2@33281 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast 2015-07-17 06:38:29 +00:00
parent 722c40dda7
commit 8429597071
1 changed files with 16 additions and 34 deletions
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50
wp-includes/wp-db.php
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@ -2675,55 +2675,37 @@ class wpdb {
$queries = array();
foreach ( $data as $col => $value ) {
if ( ! empty( $value['db'] ) ) {
if ( ! isset( $queries[ $value['charset'] ] ) ) {
$queries[ $value['charset'] ] = array();
}
// We're going to need to truncate by characters or bytes, depending on the length value we have.
if ( 'byte' === $value['length']['type'] ) {
// Split the CONVERT() calls by charset, so we can make sure the connection is right
$queries[ $value['charset'] ][ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING binary ), %.0f ) USING {$value['charset']} )", $value['value'], $value['length']['length'] );
// Using binary causes LEFT() to truncate by bytes.
$charset = 'binary';
} else {
$queries[ $value['charset'] ][ $col ] = $this->prepare( "LEFT( CONVERT( %s USING {$value['charset']} ), %.0f )", $value['value'], $value['length']['length'] );
$charset = $value['charset'];
}
$queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), %.0f ) USING {$this->charset} )", $value['value'], $value['length']['length'] );
unset( $data[ $col ]['db'] );
}
}
$connection_charset = $this->charset;
foreach ( $queries as $charset => $query ) {
$sql = array();
foreach ( $queries as $column => $query ) {
if ( ! $query ) {
continue;
}
// Change the charset to match the string(s) we're converting
if ( $charset !== $connection_charset ) {
$connection_charset = $charset;
$this->set_charset( $this->dbh, $charset );
}
$this->check_current_query = false;
$sql = array();
foreach ( $query as $column => $column_query ) {
$sql[] = $column_query . " AS x_$column";
}
$row = $this->get_row( "SELECT " . implode( ', ', $sql ), ARRAY_A );
if ( ! $row ) {
$this->set_charset( $this->dbh, $connection_charset );
return new WP_Error( 'wpdb_strip_invalid_text_failure' );
}
foreach ( array_keys( $query ) as $column ) {
$data[ $column ]['value'] = $row["x_$column"];
}
$sql[] = $query . " AS x_$column";
}
// Don't forget to change the charset back!
if ( $connection_charset !== $this->charset ) {
$this->set_charset( $this->dbh );
$this->check_current_query = false;
$row = $this->get_row( "SELECT " . implode( ', ', $sql ), ARRAY_A );
if ( ! $row ) {
return new WP_Error( 'wpdb_strip_invalid_text_failure' );
}
foreach ( array_keys( $data ) as $column ) {
$data[ $column ]['value'] = $row["x_$column"];
}
}