cocoa-chen / wcdb

Multi-platform database framework from WeChat application

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WCDB is an efficient, complete, easy-to-use mobile database framework used in the WeChat application. It's currently available on iOS, macOS and Android.

WCDB for iOS/macOS


  • WINQ (WCDB language integrated query): WINQ is a native data querying capability which frees developers from writing glue code to concatenate SQL query strings.
  • ORM (Object Relational Mapping): WCDB provides a flexible, easy-to-use ORM for creating tables, indices and constraints, as well as CRUD through ObjC objects.
  • Multi-threaded concurrency: WCDB supports concurrent read-read and read-write access via connection pooling.
  • Encryption Support: WCDB supports database encryption via SQLCipher.
  • Corruption recovery: WCDB provides a built-in repair kit for database corruption recovery.
  • Anti-injection: WCDB provides a built-in protection from SQL injection.

Getting Started


  • Apps using WCDB can target: iOS 8 or later, macOS 10.10 or later.
  • Xcode 8.0 or later required.
  • Objective-C++ required.


  • Via Carthage:
    1. Install Carthage;
    2. Add github "Tencent/WCDB" to your Cartfile;
    3. Run carthage update.
    4. Drag WCDB.framework from the appropriate platform directory in Carthage/Build/ to the Linked Binary and Libraries section of your Xcode project’s Build Phases settings;
    5. On your application targets' Build Phases settings tab, click the "+" icon and choose New Run Script Phase. Create a Run Script with carthage copy-frameworks and add the paths to the frameworks under "Input Files": $(SRCROOT)/Carthage/Build/iOS/WCDB.framework or $(SRCROOT)/Carthage/Build/Mac/WCDB.framework;
  • Via source code:
    1. Getting source code from git repository. If cloning from git, submodules are required: git submodule update --init --recursive.
    2. Drag WCDB.xcodeproj in wcdb/apple/ into your project;
    3. Add WCDB.framework to the Target Dependencies section and Linked Binary and Libraries of your Xcode project's `Build Phases" settings;
    4. Add WCDB.framework to the "Enbedded Binaries" section of your Xcode project's "General" settings;

Add #import <WCDB/WCDB.h> at the top of your Objective-C++ source files and start your WCDB journey.

Note that

  • Since WCDB is an Objective-C++ framework, for those files in your project that includes WCDB, you should rename their extension .m to .mm
  • Abot Cocoapods - WCDB links SQLCipher with each source files separately, but not a large sqlite.c file. It will be. This will be easier to debug, but the cocoapods configuration will be more complex. We will finish it as soon as possible.


Tutorials can be found here.


  • Documentations can be found on our Wiki.
  • API references for iOS/macOS can be found here.

WCDB for Android


  • Database encryption via SQLCipher.
  • Concurrent access via connection pooling from modern Android framework.
  • Repair toolkit for database corruption recovery.
  • Database backup and recovery utility optimized for small backup size.
  • Log redirection and various tracing facilities.

Getting Started

To include WCDB to your project, choose either way: import via Maven or via AAR package.

Import via Maven

To import WCDB via Maven repositories, add the following lines to build.gradle on your app module:

dependencies {
    compile 'com.tencent.wcdb:wcdb-android:1.0.0'
    // Replace "1.0.0" to any available version.

This will cause Gradle to download AAR package from jcenter while building your application.

Import Prebuilt AAR Package

  1. Download AAR package from release page.

  2. Import the AAR as new module. In Android Studio, select File -> New -> New Module... menu and choose "Import JAR/AAR Package".

  3. Add a dependency on the new module. This can be done using File -> Project Structure... in Android Studio, or by adding following code to application's build.gradle:

dependencies {
    // Change "wcdb" to the actual module name specified in step 2.
    compile project(':wcdb')

Migrate from Plain-text SQLite Databases

WCDB has interfaces very similar to Android SQLite Database APIs. To migrate you application from AOSP API, change import path from android.database.* to com.tencent.wcdb.*, and android.database.sqlite.* to com.tencent.wcdb.database.*. After import path update, your application links to WCDB instead of AOSP API.

To open or create an encrypted database, use with-password versions of SQLiteDatabase.openOrCreateDatabase(), SQLiteOpenHelper.getWritableDatabase(), or Context.openOrCreateDatabase().

Note: WCDB uses byte[] for password instead of String in SQLCipher Android Binding.

String password = "MyPassword";
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase("/path/to/database", password.getBytes(), 
        null, null);

See sample-encryptdb for sample for transferring data between plain-text and encrypted databases.

Corruption Recovery

See sample-repairdb for instructions how to recover corrupted databases using RepairKit.

Redirect Log Output

By default, WCDB prints its log message to system logcat. You may want to change this behavior in order to, for example, save logs for troubleshooting. WCDB can redirect all of its log outputs to user-defined routine using Log.setLogger(LogCallback) method.

Build from Sources

Build WCDB Android with Prebuilt Dependencies

WCDB itself can be built apart from its dependencies using Gradle or Android Studio. To build WCDB Android library, run Gradle on android directory:

$ cd android
$ ./gradlew build

Building WCDB requires Android NDK installed. If Gradle failed to find your SDK and/or NDK, you may need to create a file named on the android directory with content:


Android Studio will do this for you when the project is imported.

Build Dependencies from Sources

WCDB depends on OpenSSL crypto library and SQLCipher. You can rebuild all dependencies if you wish. In this case, a working C compiler on the host system, Perl 5, Tcl and a bash environment is needed to be installed on your system.

To build dependencies, checkout all submodules, set ANDROID_NDK_ROOT environment variable to your NDK path, then run

$ export ANDROID_NDK_ROOT=/path/to/ndk
$ ./

This will build OpenSSL crypto library and generate SQLCipher amalgamation sources and place them to proper locations suitable for WCDB library building.


  • Documentations can be found on our Wiki.
  • API references for Android can be found here.


Multi-platform database framework from WeChat application



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