Added a Database::tableExists() easy to use function, useful for unit testing.

- Adding a Doxyfile to generate documentation of the wrapper

TODO.txt

@@ -1,11 +1,10 @@
 Add a comparison of others C++ wrappers (code style, C++ design, in code documentation, tests, online documentation, examples, license, UTF-16) 
 
-Missing features in v0.3.0:
-- Database::tableExists
+Missing features in v0.4.0:
 - Blob
 - getColumnByName ? std::map getRow() ?
 
-Missing documentation in v0.3.0:
+Missing documentation in v0.4.0:
 - Help for the new helper functions
 
 Advanced missing features:

src/SQLiteC++/Database.cpp

@@ -53,13 +53,23 @@ int Database::exec(const char* apQueries) // throw(SQLite::Exception);
 // WARNING: Be very careful with this dangerous method: you have to
 // make a COPY OF THE result, else it will be destroy before the next line
 // (when the underlying temporary Statement and Column objects are destroyed)
+// this is an issue only for pointer type result (ie. char* and blob)
 Column Database::execAndGet(const char* apQuery) // throw(SQLite::Exception)
 {
-   Statement query(*this, apQuery);
-   query.executeStep();
-   return query.getColumn(0);
+    Statement query(*this, apQuery);
+    query.executeStep();
+    return query.getColumn(0);
 }
 
+// Shortcut to test if a table exists.
+bool Database::tableExists(const char* apTableName) // throw(SQLite::Exception)
+{
+    Statement query(*this, "SELECT count(*) FROM sqlite_master WHERE type='table' AND name=?");
+    query.bind(1, apTableName);
+    query.executeStep();
+    int Nb = query.getColumn(0);
+    return (1 == Nb);
+}
 
 // Check if aRet equal SQLITE_OK, else throw a SQLite::Exception with the SQLite error message
 void Database::check(const int aRet) const // throw(SQLite::Exception)

src/SQLiteC++/Database.h

@@ -78,10 +78,19 @@ public:
      *
      * @see also Statement class for handling queries with multiple results
      *
-     * @param[in] apQuery  a UTF-8 encoded SQL query
+     * @param[in] apQuery  an UTF-8 encoded SQL query
      */
     Column execAndGet(const char* apQuery); // throw(SQLite::Exception);
 
+    /**
+     * @brief Shortcut to test if a table exists.
+     *
+     *  Table names are case sensitive.
+     *
+     * @param[in] apTableName an UTF-8 encoded case sensitive Table name
+     */
+    bool tableExists(const char* apTableName); // throw(SQLite::Exception);
+
     /**
      * @brief Set a busy handler that sleeps for a specified amount of time when a table is locked.
      *

src/SQLiteC++/SQLiteC++.h

@@ -32,5 +32,5 @@
  * with the value (X*1000000 + Y*1000 + Z) where X, Y, and Z are the same
  * numbers used in [SQLITECPP_VERSION].
  */
-#define SQLITECPP_VERSION           "0.3.0"
-#define SQLITECPP_VERSION_NUMBER    0003000
+#define SQLITECPP_VERSION           "0.4.0"
+#define SQLITECPP_VERSION_NUMBER    0004000

src/example1/main.cpp

@@ -65,9 +65,11 @@ int main (void)
         SQLite::Database    db("example.db3");
         std::cout << "SQLite database file '" << db.getFilename().c_str() << "' opened successfully\n";
 
-        // TODO SRombauts:
-        //SQLite::Statement::Column col = db.execAndGet("SELECT value FROM test WHERE id=2");
-        //const char* pvalue = col;
+        // Test if the 'test' table exists
+        bool bExists = db.tableExists("test");
+        std::cout << "SQLite table 'test' exists=" << bExists << "\n";
+
+        // Get a single value result with an easy to use shortcut
         std::string value = db.execAndGet("SELECT value FROM test WHERE id=2");
         std::cout << "execAndGet=" << value << std::endl;