feat: initial commit

lib/database.c

@@ -0,0 +1,176 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <mysql/mysql.h>
+
+/* Sets global variables if not set */
+#ifdef __MAIN__
+char _server[56] = "localhost";
+char _user[56] = "pipo";
+char _password[56] = "theclown";
+char _database[56] = "mysql";
+#else
+extern char _server[56];
+extern char _user[56];
+extern char _password[56];
+extern char _database[56];
+#endif
+
+/* Variables */
+MYSQL *conn;
+MYSQL_RES *res;
+MYSQL_ROW row;
+
+MYSQL_RES *query(char *command) {
+  if (mysql_query(conn, "SHOW TABLES")) {
+    fprintf(stderr, "%s\n", mysql_error(conn));
+    exit(1);
+  }
+
+  return mysql_use_result(conn);
+}
+
+/** @brief Starts the connection to the database
+ *
+ * Initializes a conncection to `_user@_serve r`
+ * That will be used by the rest of this lib.
+ *
+ * @returns Void.
+ */
+void init_mysql() {
+  conn = mysql_init(NULL);
+  if (!mysql_real_connect(conn, _server, _user, _password, _database, 0, NULL, 0)) {
+    fprintf(stderr, "%s\n", mysql_error(conn));
+    exit(1);
+  }
+}
+
+/** @brief Ends the connection to `_server`
+ *
+ * This function is used to cleanly exit the
+ * database when operations are finished.
+ *
+ * @returns Void.
+ */
+void kill() {
+  mysql_free_result(res);
+  mysql_close(conn);
+}
+
+/* Functions that return to stdout */
+/** @brief Prints all tables available in `_database`
+ *
+ * Loops through all tables in `_database` accsessible
+ * by `_user` and prints them to stdout.
+ *
+ * @returns Void.
+ */
+void print_tables() {
+  res = query("SHOW TABLES");
+
+  while ((row = mysql_fetch_row(res)) != NULL)
+    printf("%s\n", row[0]);
+}
+
+/** @brief Prints all values of `field` from `table`
+ *
+ * Loops through `field` in `table` and prints them out
+ * to stdout.
+ *
+ * @param table The table to view
+ * @param field The field to view from `table`
+ *
+ * @returns Void.
+ */
+void print_field(char* table, char* field) {
+  char command[2048];
+  sprintf(command, "SELECT %s FROM %s", field, table);
+
+  res = query(command);
+
+  while ((row = mysql_fetch_row(res)) != NULL)
+    printf("%s\n", row[0]);
+}
+
+/* Functions that return a usable variable */
+/** @brief Returns all tables in `_database`
+ *
+ * Returns all tables in `_database` to a string,
+ * seperated with new lines (\n).
+ *
+ * @returns str The string of tables in `_database`
+ */
+char *get_tables() {
+  res = query("SHOW TABLES");
+
+  char *str = malloc(sizeof(char) * 2048);
+  sprintf(str, "");
+
+  while ((row = mysql_fetch_row(res)) != NULL)
+    sprintf(str, "%s %s\n", str, row[0]);
+
+  return str;
+}
+
+/** @brief Inserts `req` into `table` using `fieldData`
+ *
+ * Used to create an entry into `table` with `req`
+ * as data that is put into `fieldData`.
+ *
+ * @param table The table to insert the row into
+ * @param fieldData The fields to assign `req` to
+ * @param req The data to assign to the new row
+ *
+ * @returns Void
+ */
+void insert_row(char table[56], char fieldData[2048], char req[2048]) {
+  char command[2048];
+  sprintf(command, "INSERT INTO %s (%s) VALUES (%s)", table, fieldData, req);
+
+  res = query(command);
+
+  while ((row = mysql_fetch_row(res)) != NULL)
+    printf("%s\n", row[0]);
+}
+
+/** @brief Deletes row matching `identifier` from `table`
+ *
+ * This function is used to delete unwanted rows
+ * from `table` that match the conditions mentioned
+ * in `identifier`.
+ *
+ * @param table The table to match the identifier to
+ * @param identifier The conditions to use when searching
+ *
+ * @returns Void.
+ */
+void delete_row(char table[56], char identifier[2048]) {
+  char command[2048];
+  sprintf(command, "DELETE FROM %s WHERE %s", table, identifier);
+
+  res = query(command);
+
+  while ((row = mysql_fetch_row(res)) != NULL)
+    printf("%s\n", row[0]);
+}
+
+/** @brief Modify a row in `table` that match `identifier` using `data`
+ *
+ * Changes the values of rows found in `table` matching the
+ * `identifier` to the desired values passed into `data`.
+ *
+ * @param table The table to modify the row from
+ * @param identifier The identifier for the row to modify
+ * @param data The data to overwrite the row
+ * found with `identifier` with
+ *
+ * @returns Void.
+ */
+void modify_row(char table[56], char identifier[2048], char data[2048]) {
+  char command[2048];
+  sprintf(command, "UPDATE %s SET %s WHERE %s", table, data, identifier);
+
+  res = query(command);
+
+  while ((row = mysql_fetch_row(res)) != NULL)
+    printf("%s\n", row[0]);
+}