add unit test & tidy diff

Author: mlin

include/SQLiteCpp/Database.h

@@ -434,7 +434,7 @@ class Database
     /// Return UTF-8 encoded English language explanation of the most recent failed API call (if any).
     const char* getErrorMsg() const noexcept;
 
-    /// Return the filename used to open the database; empty if the Database wrapped existing sqlite3*
+    /// Return the filename used to open the database.
     const std::string& getFilename() const noexcept
     {
         return mFilename;
@@ -556,7 +556,10 @@ class Database
     static Header getHeaderInfo(const std::string& aFilename);
 
     // Parse SQLite header data from a database file.
-    Header getHeaderInfo();
+    Header getHeaderInfo()
+    {
+        return getHeaderInfo(mFilename);
+    }
 
     /**
      * @brief BackupType for the backup() method

src/Database.cpp

@@ -94,6 +94,11 @@ Database::Database(sqlite3*  apSQLite,
 {
     SQLITECPP_ASSERT(apSQLite != nullptr, "Database(nullptr)");
     mSQLitePtr.reset(apSQLite);
+    const char *zFilename = sqlite3_db_filename(mSQLitePtr.get(), nullptr);
+    if (zFilename)
+    {
+        mFilename = zFilename;
+    }
     if (aBusyTimeoutMs > 0)
     {
         setBusyTimeout(aBusyTimeoutMs);
@@ -446,18 +451,6 @@ Header Database::getHeaderInfo(const std::string& aFilename)
     return h;
 }
 
-Header Database::getHeaderInfo()
-{
-    if (!mFilename.empty())
-    {
-        return getHeaderInfo(mFilename);
-    }
-    const char *zFilename = sqlite3_db_filename(mSQLitePtr.get(), nullptr);
-    return getHeaderInfo(std::string(zFilename ? zFilename : ""));
-}
-
-
-
 void Database::backup(const char* apFilename, BackupType aType)
 {
     // Open the database file identified by apFilename

tests/Database_test.cpp

@@ -121,6 +121,28 @@ TEST(Database, createCloseReopen)
     remove("test.db3");
 }
 
+TEST(Database, wrapper)
+{
+    remove("test.db4");
+    // Create a new database using SQLite3 directly
+    sqlite3 *dbconn = nullptr;
+    int rc = sqlite3_open_v2("test.db4", &dbconn, SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE, nullptr);
+    EXPECT_EQ(rc, SQLITE_OK);
+    {
+        // instantiate SQLite::Database wrapper
+        SQLite::Database db(dbconn, 5000);
+        EXPECT_FALSE(db.tableExists("test"));
+        db.exec("CREATE TABLE test (id INTEGER PRIMARY KEY, value TEXT)");
+        EXPECT_TRUE(db.tableExists("test"));
+        std::string filename = db.getFilename();
+        EXPECT_STREQ(filename.substr(filename.rfind('/')+1).c_str(), "test.db4");
+    }
+    // dbconn remains open after db destruction
+    rc = sqlite3_close(dbconn);
+    EXPECT_EQ(rc, SQLITE_OK);
+    remove("test.db4");
+}
+
 TEST(Database, inMemory)
 {
     {