linux嵌入式控制 数据库

#include <sqlite3.h>
#include <stdio.h>

int main() {
    sqlite3 *db;
    char *err_msg = 0;

    // 打开数据库
    int rc = sqlite3_open("example.db", &db);

    if (rc != SQLITE_OK) {
        fprintf(stderr, "Cannot open database: %s\n", sqlite3_errmsg(db));
        sqlite3_close(db);
        return 1;
    }

    // 创建表
    char *sql = "CREATE TABLE IF NOT EXISTS SensorData("  \
                "ID INTEGER PRIMARY KEY AUTOINCREMENT," \
                "SensorID INT NOT NULL," \
                "Value REAL NOT NULL);";

    rc = sqlite3_exec(db, sql, 0, 0, &err_msg);

    if (rc != SQLITE_OK) {
        fprintf(stderr, "SQL error: %s\n", err_msg);
        sqlite3_free(err_msg);
        sqlite3_close(db);
        return 1;
    }

    // 插入数据
    sql = "INSERT INTO SensorData(SensorID, Value) VALUES(1, 123.45);";

    rc = sqlite3_exec(db, sql, 0, 0, &err_msg);

    if (rc != SQLITE_OK) {
        fprintf(stderr, "SQL error: %s\n", err_msg);
        sqlite3_free(err_msg);
        sqlite3_close(db);
        return 1;
    }

    // 查询数据
    sql = "SELECT * FROM SensorData;";

    sqlite3_stmt *stmt;
    rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);

    if (rc != SQLITE_OK) {
        fprintf(stderr, "Failed to fetch data: %s\n", sqlite3_errmsg(db));
        sqlite3_close(db);
        return 1;
    }

    while (sqlite3_step(stmt) == SQLITE_ROW) {
        int id = sqlite3_column_int(stmt, 0);
        int sensor_id = sqlite3_column_int(stmt, 1);
        double value = sqlite3_column_double(stmt, 2);
        printf("ID: %d, SensorID: %d, Value: %f\n", id, sensor_id, value);
    }

    sqlite3_finalize(stmt);
    sqlite3_close(db);

    return 0;
}