c++ - 消息: [unixODBC][Driver Manager]Can't open lib 'MySQL ODBC 5.1 Driver' : file not foundnSQLSTATE: 01000

Question

我想使用 C++ 和 mysql 创建 odbc 连接，并且我已附上我的代码。请帮我纠正我发布的问题标题中的错误。

#include <iostream>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>

using namespace std;

void show_error(unsigned int handletype, const SQLHANDLE& handle) {
    SQLCHAR sqlstate[1024];
    SQLCHAR message[1024];
    if(SQL_SUCCESS == SQLGetDiagRec(handletype, handle,
           1, sqlstate, NULL, message, 1024, NULL))
        cout<<"Message: "<<message<<"SQLSTATE: "<<sqlstate<<endl;
}

int main() {
    SQLHANDLE sqlenvhandle;    
    SQLHANDLE sqlconnectionhandle;
    SQLHANDLE sqlstatementhandle;
    SQLRETURN retcode;

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &sqlenvhandle))
        goto FINISHED;

    if(SQL_SUCCESS!=SQLSetEnvAttr(sqlenvhandle,
           SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0)) 
        goto FINISHED;

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_DBC, sqlenvhandle, &sqlconnectionhandle))
        goto FINISHED;

    SQLCHAR retconstring[1024];
    switch(SQLDriverConnect (sqlconnectionhandle, NULL, 
                (SQLCHAR*)"DRIVER={MySQL ODBC 5.1 Driver};PORT=3306;SERVER=localhost;DATABASE=market;UID=root;PWD=123;", 
                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);
          goto FINISHED;
     default:
          break;
    }

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_STMT, 
           sqlconnectionhandle, &sqlstatementhandle))
        goto FINISHED;

    if(SQL_SUCCESS!=SQLExecDirect(sqlstatementhandle
           SQLCHAR*)"select * from employee", SQL_NTS)) {
        show_error(SQL_HANDLE_STMT, sqlstatementhandle);
        goto FINISHED;
    }
    else{
        char name[64];
        char dept[64];

        while(SQLFetch(sqlstatementhandle)==SQL_SUCCESS){
            SQLGetData(sqlstatementhandle, 1, SQL_C_CHAR, name, 64, NULL);
            SQLGetData(sqlstatementhandle, 2, SQL_C_CHAR, dept, 64, NULL);
            cout<<" "<<name<<" "<<dept<<endl;
        }
    }

    FINISHED:
    SQLFreeHandle(SQL_HANDLE_STMT, sqlstatementhandle );
    SQLDisconnect(sqlconnectionhandle);
    SQLFreeHandle(SQL_HANDLE_DBC, sqlconnectionhandle);
    SQLFreeHandle(SQL_HANDLE_ENV, sqlenvhandle);

}

Answer 1

调用 SQLDriverConnect 时的 Driver 属性是“MySQL ODBC 5.1 Driver”，因此您的 odbcinst.ini 文件中应该有一个条目，如下所示:

[MySQL ODBC 5.1 Driver]
driver = /some/path/to/libxxx.so

您需要检查/some/path/to/libxxx.so 是否存在、可读、可执行，最后可能对其运行 ldd 以确保它所依赖的任何内容都已安装。

您可以使用命令 odbcinst -j 找到 odbcinst.ini 文件。