added support for std::utf16string

Author: aminroosta

README.md

@@ -1,7 +1,7 @@
 sqlite modern cpp wrapper
 ====
 
-This library is lightweight wrapper around sqlite C api .
+This library is a lightweight modern wrapper around sqlite C api .
 
 ```c++
 #include<iostream>
@@ -10,60 +10,62 @@ using namespace  sqlite;
 using namespace std;
 
 
-int main(){
 	try {
-		// creates a database file 'dbfile.db' if not exists
+		// creates a database file 'dbfile.db' if it does not exists.
 		database db("dbfile.db");
 
-		// executes the query and creates a 'user' table if not exists 
+		// executes the query and creates a 'user' table
 		db <<
 			"create table if not exists user ("
 			"	age int,"
 			"	name text,"
 			"	weight real"
 			");";
 
-		// inserts a new user and binds the values to ?
+		// inserts a new user record.
+		// binds the fields to '?' .
 		// note that only types allowed for bindings are :
-		//		int ,long, long long, float, double 
-		//		string , wstring
+		//		int ,long, long long, float, double
+		//		string , u16string
+		// sqlite3 only supports utf8 and utf16 strings, you should use std::string for utf8 and std::u16string for utf16.
+		// note that u"my text" is a utf16 string literal of type char16_t * .
 		db << "insert into user (age,name,weight) values (?,?,?);"
 			<< 20
-			<< "bob"
-			<< 83.0;
+			<< u"bob" // utf16 string
+			<< 83.25f;
 
-		db << "insert into user (age,name,weight) values (?,?,?);"
+		db << u"insert into user (age,name,weight) values (?,?,?);" // utf16 query string
 			<< 21
-			<< L"jack"
+			<< "jack"
 			<< 68.5;
 
-		// slects from table user on a condition ( age > 18 ) and executes 
-		// the lambda for every row returned .
-
+		// slects from user table on a condition ( age > 18 ) and executes
+		// the lambda for each row returned .
 		db << "select age,name,weight from user where age > ? ;"
 			<< 18
 			>> [&](int age, string name, double weight) {
-				cout << age << ' ' << name << ' ' << weight << endl;
-			};
+			cout << age << ' ' << name << ' ' << weight << endl;
+		};
 
-		// selects the count(*) of table user
-		// note that you can extract a single culumn single row answer only to : int,long,long,float,double,string,wstring
+		// selects the count(*) from user table
+		// note that you can extract a single culumn single row result only to : int,long,long,float,double,string,u16string
 		int count = 0;
 		db << "select count(*) from user" >> count;
 		cout << "cout : " << count << endl;
 
-		// this also works and the returned value will automatically converted to string
-		string scount;
-		db << "select count(*) from user" >> scount;
+		// this also works and the returned value will be automatically converted to string
+		string str_count;
+		db << "select count(*) from user" >> str_count;
 		cout << "scount : " << scount << endl;
 	}
-	catch (exception& e){
+	catch (exception& e) {
 		cout << e.what() << endl;
 	}
 
-}
 ```
 
+*node: for NDK use the full path to you database file : `sqlite::database db("/data/data/com.your.package/dbfile.db")`*.
+
 ##License
 
 MIT license - [http://www.opensource.org/licenses/mit-license.php](http://www.opensource.org/licenses/mit-license.php)