在C++项目中使用SQLite3数据库的全过程

vcpkg install sqlite3

find_package(SQLite3 REQUIRED)

target_link_libraries(your_target PRIVATE SQLite::SQLite3)

# CMakeList.txt: use-sqlite3 的 CMake 项目，在此处包括源代码并定义
# 项目特定的逻辑。
#
SET(CMAKE_TOOLCHAIN_FILE "D:/tools/vcpkg/scripts/buildsystems/vcpkg.cmake")
include("D:/tools/vcpkg/scripts/buildsystems/vcpkg.cmake")
if(DEFINED ENV{VCPKG_DEFAULT_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
    set(VCPKG_TARGET_TRIPLET "$ENV{VCPKG_DEFAULT_TRIPLET}" CACHE STRING "" FORCE)
endif()
# 将源代码添加到此项目的可执行文件。
add_executable (use-sqlite3 "use-sqlite3.cpp" "use-sqlite3.h")

if (CMAKE_VERSION VERSION_GREATER 3.12)
  set_property(TARGET use-sqlite3 PROPERTY CXX_STANDARD 20)
endif()

# TODO: 如有需要，请添加测试并安装目标。

find_package(SQLite3 REQUIRED)

target_link_libraries(use-sqlite3 PRIVATE SQLite::SQLite3)

// 示例代码

// use-sqlite3.cpp: 定义应用程序的入口点。
//

#include "use-sqlite3.h"
#include "sqlite3.h"

using namespace std;

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

	// 打开数据库
	rc = sqlite3_open("example.db", &db);
	if (rc) {
		std::cerr << "Can't open database: " << sqlite3_errmsg(db) << std::endl;
		return(0);
	}
	else {
		std::cout << "Opened database successfully" << std::endl;
	}

	// 创建表
	const char* sqlCreateTable = "CREATE TABLE IF NOT EXISTS test( "
		"id INTEGER PRIMARY KEY, "
		"name TEXT NOT NULL);";
	rc = sqlite3_exec(db, sqlCreateTable, 0, 0, &zErrMsg);
	if (rc != SQLITE_OK) {
		std::cerr << "SQL error: " << zErrMsg << std::endl;
		sqlite3_free(zErrMsg);
	}
	else {
		std::cout << "Table created successfully" << std::endl;
	}

	// 插入数据
	const char* sqlInsert = "INSERT INTO test(name) VALUES ('Alice');";
	rc = sqlite3_exec(db, sqlInsert, 0, 0, &zErrMsg);
	if (rc != SQLITE_OK) {
		std::cerr << "SQL error: " << zErrMsg << std::endl;
		sqlite3_free(zErrMsg);
	}
	else {
		std::cout << "Records created successfully" << std::endl;
	}

	const char* sqlUpdate = "UPDATE test SET name = 'Bob' WHERE id = 2;";
	rc = sqlite3_exec(db, sqlUpdate, 0, 0, &zErrMsg);
	if (rc != SQLITE_OK) {
		std::cerr << "SQL error: " << zErrMsg << std::endl;
		sqlite3_free(zErrMsg);
	}
	else {
		std::cout << "Record updated successfully" << std::endl;
	}

	// 查询数据
	const char* sqlSelect = "SELECT * FROM test;";
	rc = sqlite3_exec(db, sqlSelect, [](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;
		}, 0, &zErrMsg);
	if (rc != SQLITE_OK) {
		std::cerr << "SQL error: " << zErrMsg << std::endl;
		sqlite3_free(zErrMsg);
	}
	else {
		std::cout << "Operation done successfully" << std::endl;
	}

	// 关闭数据库
	sqlite3_close(db);
	std::cout << "Database closed successfully" << std::endl;

	return 0;
}