Clion创建项目sqlite数据库
1.创建工程并运行
(1)新建——project,选择工程文件夹,创建工程
(2)进入界面,等待项目启动,显示main.cpp主文件
(3)配置编译环境
默认生成了main.cpp文件,但是我们不能运行。我们缺少编译环境,点击Setting打开设置,搜索工具链,发现Clion提供的编译环境有几种MinGW,CygWin,Visual studio等。我此处选择的时MinGW,因为我的安装了MinGW,默认选择了MinGW,如果你没有下载的话,后面的位置原先有个download,点击就可以下载了。安装好之后,然后再Environment右侧选择mingw-w64的位置即可。
(4)运行main.cpp文件即可
2.连接Sqlite数据库
(1)首先前往SQLite官网下载sqlite3所需文件 SQLite Download Page
(2)解压文件,将其中的sqlite3.c和sqlite3.h拷贝到你对应的文件工程中
(3)修改CMakeLists.txt文件,添加编译选项及连接文件
cmake_minimum_required(VERSION 3.28)
project(MyDemo)
set(CMAKE_CXX_STANDARD 17)
add_executable(MyDemo main.cpp sqlite3.c)
# 指定包含目录
target_include_directories(MyDemo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
(4)创建Sqlite数据库
(5)使用Navicate监视刚才创建的Sqlite数据库
(6)编写代码:数据库连接、表创建、数据表读写
#include <iostream>
#include <sqlite3.h>
// 回调函数用于处理查询结果
static int callback(void* NotUsed, int argc, char** argv, char** azColName) {
for (int i = 0; i < argc; i++) {
std::cout << azColName[i] << ": " << (argv[i] ? argv[i] : "NULL") << std::endl;
}
std::cout << std::endl;
return 0;
}
int main() {
sqlite3* DB;
char* errorMessage = 0;
int exit = 0;
// 打开或创建数据库文件
exit = sqlite3_open("D:/WorkOther/MyDemo/test.db", &DB);
// 检查是否成功打开数据库
if (exit) {
std::cerr << "Error open DB: " << sqlite3_errmsg(DB) << std::endl;
return -1;
} else {
std::cout << "Opened Database Successfully!" << std::endl;
}
// SQL语句:创建表
const char* sql_create =
"CREATE TABLE IF NOT EXISTS COMPANY("
"ID INT PRIMARY KEY NOT NULL,"
"NAME TEXT NOT NULL,"
"AGE INT NOT NULL,"
"ADDRESS CHAR(50),"
"SALARY REAL);";
// 执行SQL语句
exit = sqlite3_exec(DB, sql_create, 0, 0, &errorMessage);
if (exit != SQLITE_OK) {
std::cerr << "Error CREATE TABLE: " << errorMessage << std::endl;
sqlite3_free(errorMessage);
} else {
std::cout << "Table created successfully" << std::endl;
}
// 插入数据到表中
const char* sql_insert =
"INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY) "
"VALUES (1, 'Paul', 32, 'California', 20000.00 ); "
"INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY) "
"VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "
"INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY) "
"VALUES (3, 'Teddy', 23, 'Norway', 20000.00 ); "
"INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY) "
"VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 ); ";
// 执行SQL语句
exit = sqlite3_exec(DB, sql_insert, 0, 0, &errorMessage);
if (exit != SQLITE_OK) {
std::cerr << "Error INSERT: " << errorMessage << std::endl;
sqlite3_free(errorMessage);
} else {
std::cout << "Records created successfully" << std::endl;
}
// 查询表中的数据
const char* sql_select = "SELECT * FROM COMPANY";
exit = sqlite3_exec(DB, sql_select, callback, 0, &errorMessage);
if (exit != SQLITE_OK) {
std::cerr << "Error SELECT: " << errorMessage << std::endl;
sqlite3_free(errorMessage);
} else {
std::cout << "Operation done successfully" << std::endl;
}
// 关闭数据库连接
sqlite3_close(DB);
return 0;
}