Visual Studio uses C++ language to connect to Access

C++ connects to Access database:

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For example: To connect to the Access database, you need to use the ODBC (Open Database Connectivity) API in C++. The following are the steps to connect to an Access database:

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1.Install ODBC driver

First you need to install the ODBC driver for Access on your computer. These drivers can be downloaded from the official Microsoft website.

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2. Create ODBC data source

Find "ODBC Data Source" or "ODBC Data Source (32-bit)" in the control panel, then create a new data source and select "Microsoft Access Driver (*.mdb, .accdb)" or "Microsoft Access Driver" as the type Program (.mdb)". Follow the prompts to set the database path and related information.

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3. Include header files

In the C++ code, the header files "sql.h", "sqlext.h" and "odbcinst.h" need to be included.

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4. Define connection handles and status variables

You need to define a connection handle and a state variable to store connection status and related information.

SQLHANDLE henv;  // 环境句柄
SQLHANDLE hdbc;  // 连接句柄
SQLRETURN retcode;  // 状态变量

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5. Initialize the ODBC environment

Use the SQLAllocHandle function to initialize the ODBC environment handle.

retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_UINTEGER);

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6. Connect to the database

Use the SQLAllocHandle function to allocate a connection handle, and then use the SQLConnect function to connect to the database.

retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
retcode = SQLConnect(hdbc, (SQLCHAR*)"ODBC数据源名称", SQL_NTS, (SQLCHAR*)"用户名", SQL_NTS, (SQLCHAR*)"密码", SQL_NTS);

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7. Execute SQL statements

After the connection is successful, you can use the SQLExecDirect function to execute SQL statements.

SQLCHAR* sql = (SQLCHAR*)"SELECT * FROM 表名";
SQLExecDirect(hstmt, sql, SQL_NTS);

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8. Disconnect

Use the SQLDisconnect and SQLFreeHandle functions to disconnect and release related resources.

SQLDisconnect(hdbc);
SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
SQLFreeHandle(SQL_HANDLE_ENV, henv);

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Summarize:

The above are the basic steps for connecting to the Access database. The specific implementation can be adjusted and optimized according to the actual situation.

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