// 还原数据库 SQLHANDLE hRestore; SQLBACKUP pfnRestore; HINSTANCE hinstLib = LoadLibraryA("sqlncli11.dll"); pfnRestore = (SQLBACKUP)GetProcAddress(hinstLib, "SqlRestore"); SQLCHAR szSQL[1024]; sprintf((char*)szSQL, "USE master RESTORE DATABASE [%s] FROM DISK = '%s%s' WITH REPLACE, MOVE '%s' TO 'D:\\Program Files\\Microsoft SQL Server\\MSSQL16.MSSQLSERVER\\MSSQL\\DATA\\%s.mdf', MOVE '%s_log' TO 'D:\\Program Files\\Microsoft SQL Server\\MSSQL16.MSSQLSERVER\\MSSQL\\DATA\\%s_log.ldf'", dbName, restoreFilePath, backupFileName, dbName, dbName, dbName, dbName); /*sprintf((char*)szSQL, "USE master RESTORE DATABASE [%s] FROM DISK = N'%s%s' WITH RECOVERY, MOVE '%s' TO 'D:\\Program Files\\Microsoft SQL Server\\MSSQL16.MSSQLSERVER\\MSSQL\\DATA\\%s.mdf', MOVE '%s_log' TO 'D:\\Program Files\\Microsoft SQL Server\\MSSQL16.MSSQLSERVER\\MSSQL\\DATA\\%s_log.ldf'", dbName, restoreFilePath, backupFileName, dbName, dbName, dbName, dbName);*/ /*sprintf((char*)szSQL, "USE master RESTORE DATABASE [%s] FROM DISK = '%s%s' WITH MOVE '%s' TO 'D:\\Program Files\\Microsoft SQL Server\\MSSQL16.MSSQLSERVER\\MSSQL\\DATA\\%s.mdf'", dbName, restoreFilePath, backupFileName, dbName, dbName);*/ ret = SQLAllocHandle(SQL_HANDLE_STMT, dbc, &stmt); ret = SQLExecDirectA(stmt, szSQL, SQL_NTS); if (SQL_SUCCEEDED(ret)) { cout << "Database restored successfully." << endl; } else { cout << "Failed to restore database." << endl; } SQLFreeHandle(SQL_HANDLE_STMT, stmt); FreeLibrary(hinstLib);
时间: 2023-07-21 21:33:25 浏览: 205
这段代码是用于还原 SQL Server 数据库的,它使用了 Windows API 函数 `LoadLibraryA` 和 `GetProcAddress` 加载了 sqlncli11.dll 库,并通过获取该库中的 `SqlRestore` 函数指针来调用还原操作。代码中使用 `sprintf` 函数构造了还原数据库的 SQL 命令,并通过 `SQLExecDirectA` 函数执行该命令。如果还原成功,则输出 "Database restored successfully.",否则输出 "Failed to restore database."。
需要注意的是,在还原数据库时,需要确保数据库文件的路径和名称与还原命令中的 `MOVE` 语句保持一致,否则还原操作可能会失败。另外,如果还原文件已经存在,则需要在 `WITH REPLACE` 参数后添加 `, REPLACE` 参数,以覆盖已有的数据库文件。
相关问题
c语言怎么键盘输入数据库数据,键盘输入数据并修改数据库sql srver+代码
要在 C 语言中通过键盘输入数据并修改数据库,你需要使用 SQL Server 的 C API。下面是一个简单的示例代码,用于演示如何通过键盘输入数据并将其添加到 SQL Server 数据库中。
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sql.h>
#include <sqlext.h>
#define SQL_RESULT_LEN 240
#define SQL_RETURN_CODE_LEN 1000
void show_error(unsigned int handletype, const SQLHANDLE& handle) {
SQLCHAR sqlstate[SQL_RETURN_CODE_LEN];
SQLCHAR message[SQL_RETURN_CODE_LEN];
if (SQL_SUCCESS == SQLGetDiagRec(handletype, handle, 1, sqlstate, NULL, message, SQL_RETURN_CODE_LEN, NULL)) {
printf("Message: %s\n", message);
}
}
int main() {
SQLHANDLE sqlenvhandle;
SQLHANDLE sqlconnectionhandle;
SQLHANDLE sqlstatementhandle;
SQLRETURN retcode;
SQLCHAR retconstring[SQL_RETURN_CODE_LEN];
SQLCHAR sqlquery[SQL_RETURN_CODE_LEN];
SQLINTEGER sql_input;
SQLCHAR sql_name[20];
SQLCHAR sql_age[20];
SQLCHAR sql_gender[20];
int loop = 1;
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &sqlenvhandle)) {
return 1;
}
if (SQL_SUCCESS != SQLSetEnvAttr(sqlenvhandle, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0)) {
return 1;
}
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_DBC, sqlenvhandle, &sqlconnectionhandle)) {
return 1;
}
//连接数据库
switch (SQLDriverConnect(sqlconnectionhandle, NULL, (SQLCHAR*)"DRIVER={SQL Server};SERVER=your_server;DATABASE=your_database;UID=your_username;PWD=your_password;", SQL_NTS, retconstring, 1024, NULL, SQL_DRIVER_NOPROMPT)) {
case SQL_SUCCESS_WITH_INFO:
show_error(SQL_HANDLE_DBC, sqlconnectionhandle);
break;
case SQL_INVALID_HANDLE:
case SQL_ERROR:
show_error(SQL_HANDLE_DBC, sqlconnectionhandle);
retcode = -1;
break;
default:
break;
}
if (retcode == -1) {
return 1;
}
//分配语句句柄
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_STMT, sqlconnectionhandle, &sqlstatementhandle)) {
return 1;
}
while (loop) {
printf("请输入姓名:");
scanf("%s", sql_name);
printf("请输入年龄:");
scanf("%d", &sql_input);
sprintf((char*)sql_age, "%d", sql_input);
printf("请输入性别:");
scanf("%s", sql_gender);
//创建查询语句
sprintf((char*)sqlquery, "INSERT INTO your_table (name, age, gender) VALUES ('%s', %s, '%s')", sql_name, sql_age, sql_gender);
//执行查询语句
retcode = SQLExecDirect(sqlstatementhandle, sqlquery, SQL_NTS);
if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
printf("数据添加成功!\n");
}
else {
printf("数据添加失败!\n");
show_error(SQL_HANDLE_STMT, sqlstatementhandle);
}
printf("是否继续添加数据?(1-是,0-否)");
scanf("%d", &loop);
}
//释放语句句柄
if (sqlstatementhandle != SQL_NULL_HANDLE) {
SQLFreeHandle(SQL_HANDLE_STMT, sqlstatementhandle);
}
//关闭连接
SQLDisconnect(sqlconnectionhandle);
//释放连接句柄
if (sqlconnectionhandle != SQL_NULL_HANDLE) {
SQLFreeHandle(SQL_HANDLE_DBC, sqlconnectionhandle);
}
//释放环境句柄
if (sqlenvhandle != SQL_NULL_HANDLE) {
SQLFreeHandle(SQL_HANDLE_ENV, sqlenvhandle);
}
return 0;
}
```
请将上面代码中的 "your_server"、"your_database"、"your_username" 和 "your_password" 分别替换为你的 SQL Server 服务器地址、数据库名称、用户名和密码。
c语言怎么键盘输入数据库数据,键盘输入数据并插入数据库sql srver+代码
可以使用 C 语言中的标准输入函数 `scanf()` 获取键盘输入数据,并通过 SQL Server Native Client 将数据插入数据库。
以下是示例代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <sql.h>
#include <sqlext.h>
int main() {
SQLHANDLE handleEnv;
SQLHANDLE handleConn;
SQLHANDLE handleStmt;
SQLCHAR query[1000];
SQLCHAR data[1000];
SQLLEN lenData;
printf("请输入数据:");
scanf("%s", data);
if (SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &handleEnv) != SQL_SUCCESS) {
printf("无法分配环境句柄!\n");
return 1;
}
if (SQLSetEnvAttr(handleEnv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0) != SQL_SUCCESS) {
printf("无法设置环境属性!\n");
return 1;
}
if (SQLAllocHandle(SQL_HANDLE_DBC, handleEnv, &handleConn) != SQL_SUCCESS) {
printf("无法分配连接句柄!\n");
return 1;
}
if (SQLConnect(handleConn, (SQLCHAR *)"server_name", SQL_NTS, (SQLCHAR *)"username", SQL_NTS, (SQLCHAR *)"password", SQL_NTS) != SQL_SUCCESS) {
printf("连接数据库失败!\n");
return 1;
}
if (SQLAllocHandle(SQL_HANDLE_STMT, handleConn, &handleStmt) != SQL_SUCCESS) {
printf("无法分配语句句柄!\n");
return 1;
}
sprintf(query, "INSERT INTO table_name (column_name) VALUES ('%s')", data);
if (SQLPrepare(handleStmt, query, SQL_NTS) != SQL_SUCCESS) {
printf("无法准备 SQL 语句!\n");
return 1;
}
if (SQLBindParameter(handleStmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, sizeof(data), 0, data, sizeof(data), &lenData) != SQL_SUCCESS) {
printf("无法绑定参数!\n");
return 1;
}
if (SQLExecute(handleStmt) != SQL_SUCCESS) {
printf("插入数据失败:%s\n", query);
return 1;
}
printf("数据插入成功!\n");
SQLFreeHandle(SQL_HANDLE_STMT, handleStmt);
SQLDisconnect(handleConn);
SQLFreeHandle(SQL_HANDLE_DBC, handleConn);
SQLFreeHandle(SQL_HANDLE_ENV, handleEnv);
return 0;
}
```
在上面的代码中,需要将 `server_name`、`username`、`password`、`table_name` 和 `column_name` 替换为实际的 SQL Server 数据库地址、用户名、密码、表名和列名。
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