### Eine Engine erstellen { #create-an-engine }

Eine SQLModel-`engine` (darunter ist es tatsächlich eine SQLAlchemy-`engine`) ist das, was die **Verbindungen** zur Datenbank hält.

Sie hätten **ein einziges `engine`-Objekt** für Ihren gesamten Code, um sich mit derselben Datenbank zu verbinden.

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[14:18] hl[14:15,17:18] *}

    // this is a live injected collection
    private final List<ClassRealmManagerDelegate> delegates;

    private final ClassRealm mavenApiRealm;

    private final ClassRealm maven4ApiRealm;

    /**
     * Patterns of artifacts provided by maven core and exported via maven api realm. These artifacts are filtered from
     * plugin and build extensions realms to avoid presence of duplicate and possibly conflicting classes on classpath.
     */

        @Test
        @DisplayName("DosFileFilter wildcard and attributes are preserved through unwrap")
        void dosFileFilter_preservesFieldsThroughUnwrap() throws Exception {
            // Test with various wildcard patterns and attribute masks
            String[] wildcards = { "*.txt", "test*", null };
            int[] attributes = { 0x10, 0x20, 0x07 };

            for (int i = 0; i < wildcards.length; i++) {

        InternalEntry entry = map.getEntry(sample);
        if (entry != null) {
          Object canonical = entry.getKey();
          if (canonical != null) { // only matters if weak/soft keys are used
            // The compiler would know this is safe if not for our use of raw types (see above).
            @SuppressWarnings("unchecked")
            E result = (E) canonical;

share the same underlying TCP socket connection. Sharing a connection has substantial performance benefits: lower latency, higher throughput (due to [TCP slow start](https://www.igvita.com/2011/10/20/faster-web-vs-tcp-slow-start/)) and conserved battery. OkHttp uses a [ConnectionPool](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-connection-pool/) that automatically reuses HTTP/1.x connections and multiplexes HTTP/2 connections.

In OkHttp some fields of the address come from the URL...

27F0..27FF    ; valid                  ;      ; NV8    # 3.2  UPWARDS QUADRUPLE ARROW..LONG RIGHTWARDS SQUIGGLE ARROW
2800..28FF    ; valid                  ;      ; NV8    # 3.0  BRAILLE PATTERN BLANK..BRAILLE PATTERN DOTS-12345678
2900..2A0B    ; valid                  ;      ; NV8    # 3.2  RIGHTWARDS TWO-HEADED ARROW WITH VERTICAL STROKE..SUMMATION WITH INTEGRAL

import java.util.stream.Collectors;

import org.apache.maven.api.model.Model;
import org.apache.maven.model.v4.MavenStaxReader;

/**
 * A utility class that analyzes Maven POM files to identify memory usage patterns and potential memory optimizations.
 * This analyzer focuses on identifying duplicate strings and their memory impact across different paths in the POM structure.
 *

/**
 * A container implementation that manages the lifecycle and dependency injection of components
 * in a crawler application. This container supports both singleton and prototype component
 * instantiation patterns.
 *
 * <p>The container provides mechanisms for:
 * <ul>
 *   <li>Registering and retrieving components by name</li>
 *   <li>Managing singleton instances with lifecycle hooks</li>

    * the loop to correctly handle acquiring the write lock with deferred
    * unlock to run at that function's completion, following the normal
    * golang lock/deferred-unlock pattern.
* Avoid creating new controller revisions for statefulsets when cache is stale ([#67039](https://github.com/kubernetes/kubernetes/pull/67039), [@mortent](https://github.com/mortent))

### Solution

To exclude objects under a list of prefix (glob) patterns from being versioned, you can send the following versioning configuration with Status set to `Enabled`.

```
<VersioningConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
        <Status>Enabled</Status>