feat: add ability to set pool options when connecting

plugins/sql/guest-js/index.ts

@@ -18,6 +18,15 @@ export interface QueryResult {
   lastInsertId?: number
 }
 
+export interface ConnectionOptions {
+  sqlite?: {
+    pool?: {
+      max_connections?: number
+      min_connections?: number
+    }
+  }
+}
+
 /**
  * **Database**
  *
@@ -45,8 +54,12 @@ export default class Database {
    * const db = await Database.load("sqlite:test.db");
    * ```
    */
-  static async load(path: string): Promise<Database> {
+  static async load(
+    path: string,
+    options?: ConnectionOptions
+  ): Promise<Database> {
     const _path = await invoke<string>('plugin:sql|load', {
+      options,
       db: path
     })
 

plugins/sql/src/commands.rs

@@ -7,7 +7,7 @@ use serde_json::Value as JsonValue;
 use sqlx::migrate::Migrator;
 use tauri::{command, AppHandle, Runtime, State};
 
-use crate::{DbInstances, DbPool, Error, LastInsertId, Migrations};
+use crate::{wrapper::ConnectionOptions, DbInstances, DbPool, Error, LastInsertId, Migrations};
 
 #[command]
 pub(crate) async fn load<R: Runtime>(
@@ -15,8 +15,9 @@ pub(crate) async fn load<R: Runtime>(
     db_instances: State<'_, DbInstances>,
     migrations: State<'_, Migrations>,
     db: String,
+    options: Option<ConnectionOptions>,
 ) -> Result<String, crate::Error> {
-    let pool = DbPool::connect(&db, &app).await?;
+    let pool = DbPool::connect(&db, &app, options).await?;
 
     if let Some(migrations) = migrations.0.lock().await.remove(&db) {
         let migrator = Migrator::new(migrations).await?;

plugins/sql/src/lib.rs

@@ -150,7 +150,7 @@ impl Builder {
                     let mut lock = instances.0.write().await;
 
                     for db in config.preload {
-                        let pool = DbPool::connect(&db, app).await?;
+                        let pool = DbPool::connect(&db, app, None).await?;
 
                         if let Some(migrations) =
                             self.migrations.as_mut().and_then(|mm| mm.remove(&db))

plugins/sql/src/wrapper.rs

@@ -33,6 +33,25 @@ pub enum DbPool {
     None,
 }
 
+#[cfg(feature = "sqlite")]
+#[derive(serde::Serialize, serde::Deserialize, Debug)]
+pub struct SqlitePoolOptions {
+    max_connections: Option<u32>,
+    min_connections: Option<u32>,
+}
+
+#[cfg(feature = "sqlite")]
+#[derive(serde::Serialize, serde::Deserialize, Debug)]
+pub struct SqliteOptions {
+    pub pool: Option<SqlitePoolOptions>,
+}
+
+#[derive(serde::Serialize, serde::Deserialize, Debug)]
+pub struct ConnectionOptions {
+    #[cfg(feature = "sqlite")]
+    pub sqlite: Option<SqliteOptions>,
+}
+
 // public methods
 /* impl DbPool {
     /// Get the inner Sqlite Pool. Returns None for MySql and Postgres pools.
@@ -68,6 +87,7 @@ impl DbPool {
     pub(crate) async fn connect<R: Runtime>(
         conn_url: &str,
         _app: &AppHandle<R>,
+        options: Option<ConnectionOptions>,
     ) -> Result<Self, crate::Error> {
         match conn_url
             .split_once(':')
@@ -89,11 +109,23 @@ impl DbPool {
                     Sqlite::create_database(conn_url).await?;
                 }
 
-                let pool = sqlx::sqlite::SqlitePoolOptions::new()
+                let mut pool_options = sqlx::sqlite::SqlitePoolOptions::new();
-                    .max_connections(1)
+
-                    .connect(conn_url);
+                let sqlite_pool_options = options
+                    .and_then(|opts| opts.sqlite)
+                    .and_then(|sqlite_opts| sqlite_opts.pool);
+
+                if let Some(custom_pool_opts) = sqlite_pool_options {
+                    if let Some(max_connections) = custom_pool_opts.max_connections {
+                        pool_options = pool_options.max_connections(max_connections);
+                    }
+
+                    if let Some(min_connections) = custom_pool_opts.min_connections {
+                        pool_options = pool_options.min_connections(min_connections);
+                    }
+                }
 
-                Ok(Self::Sqlite(pool.await?))
+                Ok(Self::Sqlite(pool_options.connect(conn_url).await?))
             }
             #[cfg(feature = "mysql")]
             "mysql" => {