LIB-12: add test_sqlite3.cc as a playground

.gitignore

@@ -25,3 +25,5 @@ test_message_cache
 test_passphrase_cache
 test_semaphore
 test_lm_dummy
+test_sqlite3
+test.db

test/test_sqlite3.cc

@@ -0,0 +1,54 @@
+#include "../src/sqlite3.h"
+#include <iostream>
+
+using namespace std;
+sqlite3 *db;
+
+static int callback(void *NotUsed, int argc, char **argv, char **azColName)
+{
+    int i;
+    for (i = 0; i < argc; i++) {
+        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+    }
+    printf("\n");
+    return 0;
+}
+
+void execute_sql(string stmt)
+{
+    char *zErrMsg = 0;
+    int rc = sqlite3_exec(db, stmt.c_str(), callback, 0, &zErrMsg);
+    if (rc != SQLITE_OK) {
+        cout << "SQL error: " << zErrMsg << endl;
+        sqlite3_free(zErrMsg);
+    }
+}
+
+void open_db()
+{
+    int rc = sqlite3_open("test.db", &db);
+
+    if (rc) {
+        cout << "Can't open database:" << sqlite3_errmsg(db) << endl;
+    } else {
+        cout << "Opened database successfully" << endl;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    string sql;
+    open_db();
+    sql = "CREATE TABLE GROUPS("
+          "ADDRESS      TEXT    PRIMARY KEY NOT NULL,"
+          "MANAGER_ADDR TEXT    NOT NULL);";
+
+    execute_sql(sql);
+
+    sql = "INSERT INTO GROUPS (ADDRESS, MANAGER_ADDR) "
+          "VALUES ('fdjklsf@fsffd.com', 'mgr1@fsd.com');";
+
+    execute_sql(sql);
+
+    sqlite3_close(db);
+}