Anschlusskabel und Stecker günstig online bestellen
In der Kategorie Anschlusskabel und Stecker finden Sie eine umfangreiche Auswahl an praktischen Zubehörartikeln – unter anderem Steckdosenstecker, Kabelverschraubungen, Zwischenschalter, Splitter und Kabel – mit denen sich die Elektronik der Beleuchtung in den eigenen Räumen optimal individualisieren lässt.
Egal ob in der privat genutzten Wohnung oder im gewerblichen Umfeld, die Beleuchtung ist ein wichtiger Bestandteil der Einrichtung und trägt einen großen Teil zur Gesamtatmosphäre eines Raumes bei. Die richtige Beleuchtung ist daher so individuell wie der eigene Geschmack. Um eine optimale Umsetzung der eigenen Ideen zu ermöglichen, gilt es die Beleuchtung entsprechend zu individualisieren. Und das klappt nur mit dem richtigen Zubehör. In der Kategorie Anschlusskabel und Stecker bieten wir unseren Kunden daher ein breites Angebot an nützlichen Zubehörteilen an, die für die Individualisierung der Beleuchtung genutzt werden können. Dabei sind in unserem Sortiment neben intelligenten Steckdosensteckern für die verschiedensten Stromnetze auch praktisch Kabelverschraubungen, Zwischenschalter und Splitter für die individuelle Kabelführung sowie komplette Kabel für den Anschluss von elektronischen Geräten aller Art erhältlich.
Anschlusskabel und Stecker in verschiedenen Varianten
In unserem Onlineshop finden Sie ein umfangreiches Angebot an Anschlusskabeln und Steckern in verschiedenen Varianten, die für die unterschiedlichsten Einsatzzwecke genutzt werden kann:
Weltreisestecker
Stromnetze sind auf der ganzen Welt unterschiedlich. Wer ein elektrisches Gerät, wie etwa eine LED Tischleuchte aus Deutschland an eine Steckdose in Großbritannien anschließen möchte, benötigt dafür einen passenden Adapter. Mit einem platzsparenden und ineinandersteckbaren Weltreisestecker wird der bequeme Einsatz von elektronischen Geräten rund um die Welt ermöglicht. Weltreisestecker sind für den Anschluss an Stromnetze in Südeuropa (10/16 Ampere, 250 Volt), die USA (10/16 Ampere, 250 Volt), Afrika und Asien (10/16 Ampere, 250 Volt) und Großbritannien (13 Ampere, 250 Volt) geeignet. Dank des kompakten Designs lassen sich die Adapter optimal im Reisegepäck mitführen.
Smart-Steckdosenstecker
Smart-Steckdosenstecker sind ein nützlicher Helfer bei der smarten Automatisierung des eigenen Zuhauses. Die Stecker ermöglichen es, smarte elektronische Geräte wie beispielsweise Smart LEDs an jeden beliebigen Ort in den eigenen Räumen anzuschließen. Dabei regeln sie nicht nur die Stromzufuhr zum angeschlossenen Verbraucher, sonder The database name.
*
* @return bool
*/
public function database_exists( $database ) {
$ddl = 'SHOW DATABASES';
$result = $this->select_all( $ddl );
if ( \count( $result ) === 0 ) {
return false;
}
foreach ( $result as $dbrow ) {
if ( $dbrow['Database'] === $database ) {
return true;
}
}
return false;
}
/**
* Creates a database.
*
* @param string $db The database name.
*
* @return bool
*/
public function create_database( $db ) {
if ( $this->database_exists( $db ) ) {
return false;
}
$ddl = \sprintf( 'CREATE DATABASE %s', $this->identifier( $db ) );
$result = $this->query( $ddl );
return $result === true;
}
/**
* Drops a database.
*
* @param string $db The database name.
*
* @return bool
*/
public function drop_database( $db ) {
if ( ! $this->database_exists( $db ) ) {
return false;
}
$ddl = \sprintf( 'DROP DATABASE IF EXISTS %s', $this->identifier( $db ) );
$result = $this->query( $ddl );
return $result === true;
}
/**
* Checks if a table exists.
*
* @param string $table The table name.
*
* @return bool
*/
public function table_exists( $table ) {
global $wpdb;
// We need last error to be clear so we can check against it easily.
$previous_last_error = $wpdb->last_error;
$previous_suppress_errors = $wpdb->suppress_errors;
$wpdb->last_error = '';
$wpdb->suppress_errors = true;
$result = $wpdb->query( "SELECT * FROM $table LIMIT 1" );
// Restore the last error, as this is not truly an error and we don't want to alarm people.
$wpdb->last_error = $previous_last_error;
$wpdb->suppress_errors = $previous_suppress_errors;
return $result !== false;
}
/**
* Wrapper to execute a query.
*
* @param string $query The query to run.
*
* @return bool
*/
public function execute( $query ) {
return $this->query( $query );
}
/**
* Executes a query.
*
* @param string $query The query to run.
*
* @return bool Whether or not the query was performed succesfully.
*/
public function query( $query ) {
global $wpdb;
$query_type = $this->determine_query_type( $query );
$data = [];
if ( $query_type === Constants::SQL_SELECT || $query_type === Constants::SQL_SHOW ) {
$data = $wpdb->get_results( $query, ARRAY_A );
if ( $data === false ) {
return false;
}
return $data;
}
else {
// INSERT, DELETE, etc...
$result = $wpdb->query( $query );
if ( $result === false ) {
return false;
}
if ( $query_type === Constants::SQL_INSERT ) {
return $wpdb->insert_id;
}
return true;
}
}
/**
* Returns a single result for a query.
*
* @param string $query The query to run.
*
* @return array|false An associative array of the result.
*/
public function select_one( $query ) {
global $wpdb;
$query_type = $this->determine_query_type( $query );
if ( $query_type === Constants::SQL_SELECT || $query_type === Constants::SQL_SHOW ) {
$result = $wpdb->query( $query );
if ( $result === false ) {
return false;
}
return $wpdb->last_result[0];
}
return false;
}
/**
* Returns all results for a query.
*
* @param string $query The query to run.
*
* @return array An array of associative arrays.
*/
public function select_all( $query ) {
return $this->query( $query );
}
/**
* Use this method for non-SELECT queries.
* Or anything where you dont necessarily expect a result string, e.g. DROPs, CREATEs, etc.
*
* @param string $ddl The query to run.
*
* @return bool
*/
public function execute_ddl( $ddl ) {
return $this->query( $ddl );
}
/**
* Drops a table
*
* @param string $table The table name.
*
* @return bool Whether or not the table was succesfully dropped.
*/
public function drop_table( $table ) {
$ddl = \sprintf( 'DROP TABLE IF EXISTS %s', $this->identifier( $table ) );
return $this->query( $ddl );
}
/**
* Creates a table.
*
* @param string $table_name The table name.
* @param array $options The options.
*
* @return Table
*/
public function create_table( $table_name, $options = [] ) {
return new Table( $this, $table_name, $options );
}
/**
* Escapes a string for usage in queries.
*
* @param string $text The string.
*
* @return string
*/
public function quote_string( $text ) {
global $wpdb;
return $wpdb->_escape( $text );
}
/**
* Returns a quoted string.
*
* @param string $text The string.
*
* @return string
*/
public function identifier( $text ) {
return '`' . $text . '`';
}
/**
* Renames a table.
*
* @param string $name The current table name.
* @param string $new_name The new table name.
*
* @return bool
*/
public function rename_table( $name, $new_name ) {
if ( empty( $name ) || empty( $new_name ) ) {
return false;
}
$sql = \sprintf( 'RENAME TABLE %s TO %s', $this->identifier( $name ), $this->identifier( $new_name ) );
return $this->execute_ddl( $sql );
}
/**
* Adds a column.
*
* @param string $table_name The table name.
* @param string $column_name The column name.
* @param string $type The column type.
* @param array $options Column options.
*
* @return bool
*/
public function add_column( $table_name, $column_name, $type, $options = [] ) {
if ( empty( $table_name ) || empty( $column_name ) || empty( $type ) ) {
return false;
}
// Default types.
if ( ! \array_key_exists( 'limit', $options ) ) {
$options['limit'] = null;
}
if ( ! \array_key_exists( 'precision', $options ) ) {
$options['precision'] = null;
}
if ( ! \array_key_exists( 'scale', $options ) ) {
$options['scale'] = null;
}
$sql = \sprintf( 'ALTER TABLE %s ADD `%s` %s', $this->identifier( $table_name ), $column_name, $this->type_to_sql( $type, $options ) );
$sql .= $this->add_column_options( $type, $options );
return $this->execute_ddl( $sql );
}
/**
* Drops a column.
*
* @param string $table_name The table name.
* @param string $column_name The column name.
*
* @return bool
*/
public function remove_column( $table_name, $column_name ) {
$sql = \sprintf( 'ALTER TABLE %s DROP COLUMN %s', $this->identifier( $table_name ), $this->identifier( $column_name ) );
return $this->execute_ddl( $sql );
}
/**
* Renames a column.
*
* @param string $table_name The table name.
* @param string $column_name The column name.
* @param string $new_column_name The new column name.
*
* @return bool
*/
public function rename_column( $table_name, $column_name, $new_column_name ) {
if ( empty( $table_name ) || empty( $column_name ) || empty( $new_column_name ) ) {
return false;
}
$column_info = $this->column_info( $table_name, $column_name );
$current_type = $column_info['type'];
$sql = \sprintf( 'ALTER TABLE %s CHANGE %s %s %s', $this->identifier( $table_name ), $this->identifier( $column_name ), $this->identifier( $new_column_name ), $current_type );
$sql .= $this->add_column_options( $current_type, $column_info );
return $this->execute_ddl( $sql );
}
/**
* Changes a column.
*
* @param string $table_name The table name.
* @param string $column_name The column name.
* @param string $type The column type.
* @param array $options Column options.
*
* @return bool
*/
public function change_column( $table_name, $column_name, $type, $options = [] ) {
if ( empty( $table_name ) || empty( $column_name ) || empty( $type ) ) {
return false;
}
$column_info = $this->column_info( $table_name, $column_name );
// Default types.
if ( ! \array_key_exists( 'limit', $options ) ) {
$options['limit'] = null;
}
if ( ! \array_key_exists( 'precision', $options ) ) {
$options['precision'] = null;
}
if ( ! \array_key_exists( 'scale', $options ) ) {
$options['scale'] = null;
}
$sql = \sprintf( 'ALTER TABLE `%s` CHANGE `%s` `%s` %s', $table_name, $column_name, $column_name, $this->type_to_sql( $type, $options ) );
$sql .= $this->add_column_options( $type, $options );
return $this->execute_ddl( $sql );
}
/**
* Returns the database information for a column.
*
* @param string $table The table name.
* @param string $column The column name.
*
* @return array|null
*/
public function column_info( $table, $column ) {
if ( empty( $table ) || empty( $column ) ) {
return null;
}
try {
$sql = \sprintf( "SHOW FULL COLUMNS FROM %s LIKE '%s'", $this->identifier( $table ), $column );
$result = $this->select_one( $sql );
if ( \is_array( $result ) ) {
$result = \array_change_key_case( $result, \CASE_LOWER );
}
return $result;
} catch ( \Exception $e ) {
return null;
}
}
/**
* Adds an index.
*
* @param string $table_name The table name.
* @param array|string $column_name The column name(s).
* @param array $options Index options.
*
* @return bool
*/
public function add_index( $table_name, $column_name, $options = [] ) {
if ( empty( $table_name ) || empty( $column_name ) ) {
return false;
}
// Unique index?
if ( \is_array( $options ) && \array_key_exists( 'unique', $options ) && $options['unique'] === true ) {
$unique = true;
}
else {
$unique = false;
}
// Did the user specify an index name?
if ( \is_array( $options ) && \array_key_exists( 'name', $options ) ) {
$index_name = $options['name'];
}
else {
$index_name = $this->get_index_name( $table_name, $column_name );
}
if ( \strlen( $index_name ) > Constants::MYSQL_MAX_IDENTIFIER_LENGTH ) {
return false;
}
if ( ! \is_array( $column_name ) ) {
$column_names = [ $column_name ];
}
else {
$column_names = $column_name;
}
$cols = [];
foreach ( $column_names as $name ) {
$cols[] = $this->identifier( $name );
}
$sql = \sprintf(
'CREATE %sINDEX %s ON %s(%s)',
( $unique === true ) ? 'UNIQUE ' : '',
$this->identifier( $index_name ),
$this->identifier( $table_name ),
\implode( ', ', $cols )
);
return $this->execute_ddl( $sql );
}
/**
* Drops an index.
*
* @param string $table_name The table name.
* @param array|string $column_name The column name(s).
* @param array $options Index options.
*
* @return bool
*/
public function remove_index( $table_name, $column_name, $options = [] ) {
if ( empty( $table_name ) || empty( $column_name ) ) {
return false;
}
// Did the user specify an index name?
if ( \is_array( $options ) && \array_key_exists( 'name', $options ) ) {
$index_name = $options['name'];
}
else {
$index_name = $this->get_index_name( $table_name, $column_name );
}
$sql = \sprintf( 'DROP INDEX %s ON %s', $this->identifier( $index_name ), $this->identifier( $table_name ) );
return $this->execute_ddl( $sql );
}
/**
* Adds timestamps.
*
* @param string $table_name The table name.
* @param string $created_column_name Created at column name.
* @param string $updated_column_name Updated at column name.
*
* @return bool
*/
public function add_timestamps( $table_name, $created_column_name, $updated_column_name ) {
if ( empty( $table_name ) || empty( $created_column_name ) || empty( $updated_column_name ) ) {
return false;
}
$created_at = $this->add_column( $table_name, $created_column_name, 'datetime' );
$updated_at = $this->add_column(
$table_name,
$updated_column_name,
'timestamp',
[
'null' => false,
'default' => 'CURRENT_TIMESTAMP',
'extra' => 'ON UPDATE CURRENT_TIMESTAMP',
]
);
return $created_at && $updated_at;
}
/**
* Removes timestamps.
*
* @param string $table_name The table name.
* @param string $created_column_name Created at column name.
* @param string $updated_column_name Updated at column name.
*
* @return bool Whether or not the timestamps were removed.
*/
public function remove_timestamps( $table_name, $created_column_name, $updated_column_name ) {
if ( empty( $table_name ) || empty( $created_column_name ) || empty( $updated_column_name ) ) {
return false;
}
$updated_at = $this->remove_column( $table_name, $created_column_name );
$created_at = $this->remove_column( $table_name, $updated_column_name );
return $created_at && $updated_at;
}
/**
* Checks an index.
*
* @param string $table_name The table name.
* @param array|string $column_name The column name(s).
* @param array $options Index options.
*
* @return bool Whether or not the index exists.
*/
public function has_index( $table_name, $column_name, $options = [] ) {
if ( empty( $table_name ) || empty( $column_name ) ) {
return false;
}
// Did the user specify an index name?
if ( \is_array( $options ) && \array_key_exists( 'name', $options ) ) {
$index_name = $options['name'];
}
else {
$index_name = $this->get_index_name( $table_name, $column_name );
}
$indexes = $this->indexes( $table_name );
foreach ( $indexes as $idx ) {
if ( $idx['name'] === $index_name ) {
return true;
}
}
return false;
}
/**
* Returns all indexes of a table.
*
* @param string $table_name The table name.
*
* @return array
*/
public function indexes( $table_name ) {
$sql = \sprintf( 'SHOW KEYS FROM %s', $this->identifier( $table_name ) );
$result = $this->select_all( $sql );
$indexes = [];
foreach ( $result as $row ) {
// Skip primary.
if ( $row['Key_name'] === 'PRIMARY' ) {
continue;
}
$indexes[] = [
'name' => $row['Key_name'],
'unique' => (int) $row['Non_unique'] === 0,
];
}
return $indexes;
}
/**
* Converts a type to sql. Default options:
* $limit = null, $precision = null, $scale = null
*
* @param string $type The native type.
* @param array $options The options.
*
* @return string The SQL type.
*
* @throws Exception If invalid arguments are supplied.
*/
public function type_to_sql( $type, $options = [] ) {
$natives = $this->native_database_types();
if ( ! \array_key_exists( $type, $natives ) ) {
$error = \sprintf( "Error:I dont know what column type of '%s' maps to for MySQL.", $type );
$error .= "\nYou provided: {$type}\n";
$error .= "Valid types are: \n";
$types = \array_keys( $natives );
foreach ( $types as $t ) {
if ( $t === 'primary_key' ) {
continue;
}
$error .= "\t{$t}\n";
}
throw new Exception( $error );
}
$scale = null;
$precision = null;
$limit = null;
if ( isset( $options['precision'] ) ) {
$precision = $options['precision'];
}
if ( isset( $options['scale'] ) ) {
$scale = $options['scale'];
}
if ( isset( $options['limit'] ) ) {
$limit = $options['limit'];
}
if ( isset( $options['values'] ) ) {
$values = $options['values'];
}
$native_type = $natives[ $type ];
if ( \is_array( $native_type ) && \array_key_exists( 'name', $native_type ) ) {
$column_type_sql = $native_type['name'];
}
else {
return $native_type;
}
if ( $type === 'decimal' || $type === 'float' ) {
// Ignore limit, use precison and scale.
if ( $precision === null && \array_key_exists( 'precision', $native_type ) ) {
$precision = $native_type['precision'];
}
if ( $scale === null && \array_key_exists( 'scale', $native_type ) ) {
$scale = $native_type['scale'];
}
if ( $precision !== null ) {
if ( \is_int( $scale ) ) {
$column_type_sql .= \sprintf( '(%d, %d)', $precision, $scale );
}
else {
$column_type_sql .= \sprintf( '(%d)', $precision );
}
}
else {
if ( $scale ) {
throw new Exception( "Error adding $type column: precision cannot be empty if scale is specified" );
}
}
}
elseif ( $type === 'enum' ) {
if ( empty( $values ) ) {
throw new Exception( 'Error adding enum column: there must be at least one value defined' );
}
else {
$column_type_sql .= \sprintf(
"('%s')",
\implode( "','", \array_map( [ $this, 'quote_string' ], $values ) )
);
}
}
// Not a decimal column.
if ( $limit === null && \array_key_exists( 'limit', $native_type ) ) {
$limit = $native_type['limit'];
}
if ( $limit ) {
$column_type_sql .= \sprintf( '(%d)', $limit );
}
return $column_type_sql;
}
/**
* Adds column options.
*
* @param string $type The native type.
* @param array $options The options.
*
* @return string The SQL statement for the column options.
*
* @throws Exception If invalid arguments are supplied.
*/
public function add_column_options( $type, $options ) {
$sql = '';
if ( ! \is_array( $options ) ) {
return $sql;
}
if ( \array_key_exists( 'unsigned', $options ) && $options['unsigned'] === true ) {
$sql .= ' UNSIGNED';
}
if ( \array_key_exists( 'character', $options ) ) {
$sql .= \sprintf( ' CHARACTER SET %s', $this->identifier( $options['character'] ) );
}
if ( \array_key_exists( 'collate', $options ) ) {
$sql .= \sprintf( ' COLLATE %s', $this->identifier( $options['collate'] ) );
}
if ( \array_key_exists( 'auto_increment', $options ) && $options['auto_increment'] === true ) {
$sql .= ' auto_increment';
}
if ( \array_key_exists( 'default', $options ) && $options['default'] !== null ) {
if ( $this->is_sql_method_call( $options['default'] ) ) {
throw new Exception( 'MySQL does not support function calls as default values, constants only.' );
}
if ( \is_int( $options['default'] ) ) {
$default_format = '%d';
}
elseif ( \is_bool( $options['default'] ) ) {
$default_format = "'%d'";
}
elseif ( $options['default'] === 'CURRENT_TIMESTAMP' ) {
$default_format = '%s';
}
else {
$default_format = "'%s'";
}
$default_value = \sprintf( $default_format, $options['default'] );
$sql .= \sprintf( ' DEFAULT %s', $default_value );
}
if ( \array_key_exists( 'null', $options ) ) {
if ( $options['null'] === false || $options['null'] === 'NO' ) {
$sql .= ' NOT NULL';
}
elseif ( $type === 'timestamp' ) {
$sql .= ' NULL';
}
}
if ( \array_key_exists( 'comment', $options ) ) {
$sql .= \sprintf( " COMMENT '%s'", $this->quote_string( $options['comment'] ) );
}
if ( \array_key_exists( 'extra', $options ) ) {
$sql .= \sprintf( ' %s', $this->quote_string( $options['extra'] ) );
}
if ( \array_key_exists( 'after', $options ) ) {
$sql .= \sprintf( ' AFTER %s', $this->identifier( $options['after'] ) );
}
return $sql;
}
/**
* Returns a list of all versions that have been migrated.
*
* @return string[] The version numbers that have been migrated.
*/
public function get_migrated_versions() {
$result = $this->select_all( \sprintf( 'SELECT version FROM %s', $this->get_schema_version_table_name() ) );
return \array_column( $result, 'version' );
}
/**
* Adds a migrated version.
*
* @param string $version The version.
*
* @return bool Whether or not the version was succesfully set.
*/
public function add_version( $version ) {
$sql = \sprintf( "INSERT INTO %s (version) VALUES ('%s')", $this->get_schema_version_table_name(), $version );
return $this->execute_ddl( $sql );
}
/**
* Removes a migrated version.
*
* @param string $version The version.
*
* @return bool Whether or not the version was succesfully removed.
*/
public function remove_version( $version ) {
$sql = \sprintf( "DELETE FROM %s WHERE version = '%s'", $this->get_schema_version_table_name(), $version );
return $this->execute_ddl( $sql );
}
/**
* Returns a message displaying the current version
*
* @return string
*/
public function __toString() {
return self::class . ', version ' . $this->version;
}
/**
* Returns an index name.
*
* @param string $table_name The table name.
* @param string $column_name The column name.
*
* @return string The index name.
*/
private function get_index_name( $table_name, $column_name ) {
$name = \preg_replace( '/\\W/', '_', $table_name );
$name = \preg_replace( '/\\_{2,}/', '_', $name );
// If the column parameter is an array then the user wants to create a multi-column index.
if ( \is_array( $column_name ) ) {
$column_str = \implode( '_and_', $column_name );
}
else {
$column_str = $column_name;
}
$name .= \sprintf( '_%s', $column_str );
return $name;
}
/**
* Returns the type of a query.
*
* @param string $query The query to run.
*
* @return int The query type.
*/
private function determine_query_type( $query ) {
$query = \strtolower( \trim( $query ) );
$match = [];
\preg_match( '/^(\\w)*/i', $query, $match );
$type = $match[0];
switch ( $type ) {
case 'select':
return Constants::SQL_SELECT;
case 'update':
return Constants::SQL_UPDATE;
case 'delete':
return Constants::SQL_DELETE;
case 'insert':
return Constants::SQL_INSERT;
case 'alter':
return Constants::SQL_ALTER;
case 'drop':
return Constants::SQL_DROP;
case 'create':
return Constants::SQL_CREATE;
case 'show':
return Constants::SQL_SHOW;
case 'rename':
return Constants::SQL_RENAME;
case 'set':
return Constants::SQL_SET;
default:
return Constants::SQL_UNKNOWN_QUERY_TYPE;
}
}
/**
* Detect whether or not the string represents a function call and if so
* do not wrap it in single-quotes, otherwise do wrap in single quotes.
*
* @param string $text The string.
*
* @return bool Whether or not it's a SQL function call.
*/
private function is_sql_method_call( $text ) {
$text = \trim( $text );
if ( \substr( $text, -2, 2 ) === '()' ) {
return true;
}
return false;
}
/**
* Checks if a transaction is active.
*
* @return bool
*/
private function in_transaction() {
return $this->in_transaction;
}
/**
* Starts a transaction.
*
* @return void
*
* @throws Exception If a transaction was already started.
*/
private function begin_transaction() {
global $wpdb;
if ( $this->in_transaction === true ) {
throw new Exception( 'Transaction already started' );
}
$wpdb->query( 'START TRANSACTION' );
$this->in_transaction = true;
}
/**
* Commits a transaction.
*
* @return void
*
* @throws Exception If no transaction was strated.
*/
private function commit() {
global $wpdb;
if ( $this->in_transaction === false ) {
throw new Exception( 'Transaction not started' );
}
$wpdb->query( 'COMMIT' );
$this->in_transaction = false;
}
/**
* Rollbacks a transaction.
*
* @return void
*
* @throws Exception If no transaction was started.
*/
private function rollback() {
global $wpdb;
if ( $this->in_transaction === false ) {
throw new Exception( 'Transaction not started' );
}
$wpdb->query( 'ROLLBACK' );
$this->in_transaction = false;
}
}
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