o Adding utility to insert samples from json files.

1 files changed, 78 insertions, 0 deletions

diff --git a/apps/sm-db-insert.cpp b/apps/sm-db-insert.cpp
new file mode 100644
index 0000000..a3ebb76
--- /dev/null
+++ b/apps/sm-db-insert.cpp
@@ -0,0 +1,78 @@
+#include <boost/optional.hpp>
+#include <boost/lexical_cast.hpp>
+#include <pqxx/connection.hxx>
+#include <pqxx/transaction.hxx>
+#include "json.hpp"
+#include <fstream>
+
+template<class T>
+using o = boost::optional<T>;
+using namespace std;
+using json = nlohmann::json;
+
+class missing_key : public runtime_error {
+public:
+    missing_key(const json::string_t key) : runtime_error("Missing key: " + key), key(key) {
+    }
+
+    const json::string_t key;
+};
+
+template<typename T>
+T get(json j, string key) {
+    auto ref = j[key];
+
+    if (ref.is_null()) {
+        throw missing_key(key);
+    }
+
+    return ref;
+}
+
+int main(int argc, char *argv[]) {
+    cout << "reading from " << argv[1] << endl;
+
+    fstream f(argv[1]);
+
+    json j;
+
+    j << f;
+
+    pqxx::connection c("host=localhost dbname=soil-moisture");
+
+    pqxx::work work(c);
+
+    string mac = j["mac"]; // "aa:bb:cc:dd:ee:ff";
+
+    auto rs = work.parameterized("select id from soil_moisture_device where mac=$1")(mac).exec();
+
+    if (!rs.size()) {
+        cout << "New device: " << mac << endl;
+
+        rs = work.parameterized("insert into soil_moisture_device(mac) values($1) returning id")(mac).exec();
+    }
+
+    auto deviceId = rs.begin()["id"].as<int>();
+
+    int sensor = j["sensor"];
+
+    rs = work.parameterized("select id from soil_moisture_sensor where device=$1 and sensor=$2")(deviceId)(sensor).exec();
+
+    if (!rs.size()) {
+        cout << "New sensor: " << sensor << endl;
+
+        rs = work.parameterized("insert into soil_moisture_sensor(device, sensor) values($1, $2) returning id")(deviceId)(sensor).exec();
+    }
+    auto sensorId = rs.begin()["id"].as<int>();
+
+    unsigned long timestamp = get<unsigned long>(j, "timestamp");
+    unsigned int value = get<unsigned int>(j, "value");
+
+    work.parameterized("insert into soil_moisture_sample(sensor, timestamp, value) values($1, $2, $3)")(sensorId)(timestamp)(value).exec();
+
+    cout << "Sample inserted" << endl;
+
+    work.commit();
+
+    return EXIT_SUCCESS;
+}