Initial commit

.gitignore

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+*.sqlite
+*.exe

Makefile

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+main.exe: main.cpp
+	g++ -I./lib -L. -lsqlite3 main.cpp -o main.exe

README.md

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+### Compile:
+* make main.exe
+
+### Useful links
+* https://inloop.github.io/sqlite-viewer/
+* https://www.tutorialspoint.com/sqlite/sqlite_c_cpp.htm
+* https://www.sqlite.org/cintro.html

main.cpp

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+#include <iostream>
+#include <string>
+#include "sqlite3.h"
+
+const char *DB_FILE_NAME = "example.sqlite";
+
+sqlite3 *db = nullptr;
+sqlite3_stmt *ins_log_stmt = nullptr;
+
+int create_tables() {
+    char *err_msg = nullptr;
+    int rc = sqlite3_exec(
+        db,
+        "CREATE TABLE IF NOT EXISTS logs("\
+            "id INTEGER PRIMARY KEY AUTOINCREMENT,"\
+            "data TEXT,"\
+            "datetime TIMESTAMP DEFAULT CURRENT_TIMESTAMP"\
+        ")",
+        NULL,
+        0,
+        &err_msg
+    );
+    if (rc) {
+        std::cout << "Error: " << err_msg << std::endl;
+        sqlite3_free(err_msg);
+    }
+    return rc;
+}
+
+int prepare_statements() {
+    std::string sql = "INSERT INTO logs (data) VALUES (?);";
+    return sqlite3_prepare_v2(
+        db,
+        sql.c_str(),
+        sql.length(),
+        &ins_log_stmt,
+        nullptr
+    );
+}
+
+static int logs_callback(void *data, int argc, char **argv, char **azColName){
+   if (argc == 3) {
+       std::cout << argv[0] << ". (" << argv[2] << ") " << argv[1] << std::endl;
+   } else {
+       std::cout << "Error: Expected 3 columns, got " << argc << std::endl;
+   }
+
+   return 0;
+}
+
+int list_logs() {
+    char *err_msg = nullptr;
+    std::string sql = "SELECT id, data, datetime FROM logs";
+    int rc = sqlite3_exec(db, sql.c_str(), logs_callback, NULL, &err_msg);
+    if (rc != SQLITE_OK) {
+        std::cout << "Error: " << err_msg << std::endl;
+        sqlite3_free(err_msg);
+    }
+    return rc;
+}
+
+int insert_log(std::string data) {
+    int rc = sqlite3_bind_text(
+        ins_log_stmt,
+        1,
+        data.c_str(),
+        data.length(),
+        SQLITE_STATIC
+    );
+    if (rc) {
+        return rc;
+    }
+
+    rc = sqlite3_step(ins_log_stmt);
+    if (rc != SQLITE_DONE) {
+        return rc;
+    }
+
+    rc = sqlite3_reset(ins_log_stmt);
+    if (rc) {
+        return rc;
+    }
+
+    return rc;
+}
+
+int main() {
+    int rc = sqlite3_open(DB_FILE_NAME, &db);
+    if (rc) {
+        std::cout << "Error code: " << rc << std::endl;
+        return rc;
+    }
+
+    rc = create_tables();
+    if (rc) {
+        std::cout << "Error code: " << rc << std::endl;
+        return rc;
+    }
+
+    rc = prepare_statements();
+    if (rc) {
+        std::cout << "Error code: " << rc << std::endl;
+        return rc;
+    }
+
+    rc = list_logs();
+    if (rc) {
+        std::cout << "Error code: " << rc << std::endl;
+        return rc;
+    }
+
+    rc = insert_log("wolf (test log)");
+    if (rc) {
+        std::cout << "Error code123: " << rc << std::endl;
+        return rc;
+    }
+
+    rc = insert_log("lion (test log2)");
+    if (rc) {
+        std::cout << "Error code: " << rc << std::endl;
+        return rc;
+    }
+
+    sqlite3_close(db);
+
+    return 0;
+}