Add API support for transaction.

core/src/main/java/org/litepal/LitePal.kt

@@ -54,6 +54,26 @@ object LitePal {
     @JvmStatic
     fun getDatabase(): SQLiteDatabase = Operator.getDatabase()
 
+    /**
+     * Begins a transaction in EXCLUSIVE mode.
+     */
+    @JvmStatic
+    fun beginTransaction() = Operator.beginTransaction()
+
+    /**
+     * End a transaction.
+     */
+    @JvmStatic
+    fun endTransaction() = Operator.endTransaction()
+
+    /**
+     * Marks the current transaction as successful. Do not do any more database work between calling this and calling endTransaction.
+     * Do as little non-database work as possible in that situation too.
+     * If any errors are encountered between this and endTransaction the transaction will still be committed.
+     */
+    @JvmStatic
+    fun setTransactionSuccessful() = Operator.setTransactionSuccessful()
+
     /**
      * Switch the using database to the one specified by parameter.
      * @param litePalDB

core/src/main/java/org/litepal/Operator.java

@@ -95,6 +95,29 @@ public class Operator {
         return Connector.getDatabase();
     }
 
+    /**
+     * Begins a transaction in EXCLUSIVE mode.
+     */
+    public static void beginTransaction() {
+        getDatabase().beginTransaction();
+    }
+
+    /**
+     * End a transaction.
+     */
+    public static void endTransaction() {
+        getDatabase().endTransaction();
+    }
+
+    /**
+     * Marks the current transaction as successful. Do not do any more database work between calling this and calling endTransaction.
+     * Do as little non-database work as possible in that situation too.
+     * If any errors are encountered between this and endTransaction the transaction will still be committed.
+     */
+    public static void setTransactionSuccessful() {
+        getDatabase().setTransactionSuccessful();
+    }
+
     /**
      * Switch the using database to the one specified by parameter.
      * @param litePalDB
@@ -1191,8 +1214,17 @@ public class Operator {
      */
     public static int deleteAll(Class<?> modelClass, String... conditions) {
         synchronized (LitePalSupport.class) {
-            DeleteHandler deleteHandler = new DeleteHandler(Connector.getDatabase());
-            return deleteHandler.onDeleteAll(modelClass, conditions);
+            int rowsAffected;
+            SQLiteDatabase db = Connector.getDatabase();
+            db.beginTransaction();
+            try {
+                DeleteHandler deleteHandler = new DeleteHandler(db);
+                rowsAffected = deleteHandler.onDeleteAll(modelClass, conditions);
+                db.setTransactionSuccessful();
+                return rowsAffected;
+            } finally {
+                db.endTransaction();
+            }
         }
     }
 

core/src/main/java/org/litepal/crud/LitePalSupport.java

@@ -203,13 +203,18 @@ public class LitePalSupport {
 	 */
 	public int update(long id) {
         synchronized (LitePalSupport.class) {
+            SQLiteDatabase db = Connector.getDatabase();
+            db.beginTransaction();
             try {
                 UpdateHandler updateHandler = new UpdateHandler(Connector.getDatabase());
                 int rowsAffected = updateHandler.onUpdate(this, id);
                 getFieldsToSetToDefault().clear();
+                db.setTransactionSuccessful();
                 return rowsAffected;
             } catch (Exception e) {
                 throw new LitePalSupportException(e.getMessage(), e);
+            } finally {
+                db.endTransaction();
             }
         }
 	}
@@ -272,13 +277,18 @@ public class LitePalSupport {
 	 */
 	public int updateAll(String... conditions) {
         synchronized (LitePalSupport.class) {
+            SQLiteDatabase db = Connector.getDatabase();
+            db.beginTransaction();
             try {
                 UpdateHandler updateHandler = new UpdateHandler(Connector.getDatabase());
                 int rowsAffected = updateHandler.onUpdateAll(this, conditions);
                 getFieldsToSetToDefault().clear();
+                db.setTransactionSuccessful();
                 return rowsAffected;
             } catch (Exception e) {
                 throw new LitePalSupportException(e.getMessage(), e);
+            } finally {
+                db.endTransaction();
             }
         }
 	}