add data packages and remove empty submodule

packages/data/radixtree/examples/prefix_operations.rs

@@ -0,0 +1,97 @@
+use radixtree::RadixTree;
+use std::path::PathBuf;
+
+fn main() -> Result<(), radixtree::Error> {
+    // Create a temporary directory for the database
+    let db_path = std::env::temp_dir().join("radixtree_prefix_example");
+    std::fs::create_dir_all(&db_path)?;
+    
+    println!("Creating radix tree at: {}", db_path.display());
+    
+    // Create a new radix tree
+    let mut tree = RadixTree::new(db_path.to_str().unwrap(), true)?;
+    
+    // Store data with common prefixes
+    println!("Storing data with common prefixes...");
+    
+    // User data
+    tree.set("user:1:name", b"Alice".to_vec())?;
+    tree.set("user:1:email", b"alice@example.com".to_vec())?;
+    tree.set("user:2:name", b"Bob".to_vec())?;
+    tree.set("user:2:email", b"bob@example.com".to_vec())?;
+    
+    // Post data
+    tree.set("post:1:title", b"First Post".to_vec())?;
+    tree.set("post:1:content", b"Hello World!".to_vec())?;
+    tree.set("post:2:title", b"Second Post".to_vec())?;
+    tree.set("post:2:content", b"Another post content".to_vec())?;
+    
+    // Demonstrate listing keys with a prefix
+    println!("\nListing keys with prefix 'user:1:'");
+    let user1_keys = tree.list("user:1:")?;
+    for key in &user1_keys {
+        println!("  Key: {}", key);
+    }
+    
+    println!("\nListing keys with prefix 'post:'");
+    let post_keys = tree.list("post:")?;
+    for key in &post_keys {
+        println!("  Key: {}", key);
+    }
+    
+    // Demonstrate getting all values with a prefix
+    println!("\nGetting all values with prefix 'user:1:'");
+    let user1_values = tree.getall("user:1:")?;
+    for (i, value) in user1_values.iter().enumerate() {
+        println!("  Value {}: {}", i + 1, String::from_utf8_lossy(value));
+    }
+    
+    // Demonstrate finding all user names
+    println!("\nFinding all user names (prefix 'user:*:name')");
+    let mut user_names = Vec::new();
+    let all_keys = tree.list("user:")?;
+    for key in all_keys {
+        if key.ends_with(":name") {
+            if let Ok(value) = tree.get(&key) {
+                user_names.push((key, String::from_utf8_lossy(&value).to_string()));
+            }
+        }
+    }
+    
+    for (key, name) in user_names {
+        println!("  {}: {}", key, name);
+    }
+    
+    // Demonstrate updating values with a specific prefix
+    println!("\nUpdating all post titles...");
+    let post_title_keys = tree.list("post:")?.into_iter().filter(|k| k.ends_with(":title")).collect::<Vec<_>>();
+    
+    for key in post_title_keys {
+        let old_value = tree.get(&key)?;
+        let old_title = String::from_utf8_lossy(&old_value);
+        let new_title = format!("UPDATED: {}", old_title);
+        
+        println!("  Updating '{}' to '{}'", old_title, new_title);
+        tree.update(&key, new_title.as_bytes().to_vec())?;
+    }
+    
+    // Verify updates
+    println!("\nVerifying updates:");
+    let post_keys = tree.list("post:")?;
+    for key in post_keys {
+        if key.ends_with(":title") {
+            let value = tree.get(&key)?;
+            println!("  {}: {}", key, String::from_utf8_lossy(&value));
+        }
+    }
+    
+    // Clean up (optional)
+    if std::env::var("KEEP_DB").is_err() {
+        std::fs::remove_dir_all(&db_path)?;
+        println!("\nCleaned up database directory");
+    } else {
+        println!("\nDatabase kept at: {}", db_path.display());
+    }
+    
+    Ok(())
+}