MySql C连接器getString（）无法正常工作，而getInt工作正常

我试图将C连接到MySql，但我无法使其正常工作 . 我从Oracle站点使用了最新的MySql和C / Connector for Windows . 我也用VS2010 .

它编译，一切都工作除了getString！我使用了他们提供的一些调整的例子：

#include "stdafx.h"


#include <stdlib.h>
#include <iostream>
#include <sstream>
#include <stdexcept>

#include <driver/mysql_public_iface.h>

#include "examples.h"

using namespace std;

int main(int argc, const char **argv)
{
string url(argc >= 2 ? argv[1] : EXAMPLE_HOST);
const string user(argc >= 3 ? argv[2] : EXAMPLE_USER);
const string pass(argc >= 4 ? argv[3] : EXAMPLE_PASS);
const string database(argc >= 5 ? argv[4] : EXAMPLE_DB);

/* sql::ResultSet.rowsCount() returns size_t */
size_t row;
stringstream sql;
stringstream msg;
int i, affected_rows;

cout << boolalpha;
cout << "1..1" << endl;
cout << "# Connector/C++ connect basic usage example.." << endl;
cout << "#" << endl;

try {
    sql::Driver * driver = sql::mysql::get_driver_instance();
    /* Using the Driver to create a connection */
    std::auto_ptr< sql::Connection > con(driver->connect("localhost", "root", "root"));

    /* Creating a "simple" statement - "simple" = not a prepared statement */
    std::auto_ptr< sql::Statement > stmt(con->createStatement());

    /* Create a test table demonstrating the use of sql::Statement.execute() */
    stmt->execute("USE publications");
    cout << "#\t Test table created" << endl;

    /* Populate the test table with data */

    cout << "#\t Test table populated" << endl;

    {
        /*
        Run a query which returns exactly one result set like SELECT
        Stored procedures (CALL) may return more than one result set
        */
        std::auto_ptr< sql::ResultSet > res(stmt->executeQuery("SELECT id, task FROM to_do_list ORDER BY id ASC"));
        cout << "#\t Running 'SELECT id, task FROM to_do_list ORDER BY id ASC'" << endl;

        /* Number of rows in the result set */
        cout << "#\t\t Number of rows\t";
        cout << "res->rowsCount() = " << res->rowsCount() << endl;
        if (res->rowsCount() != EXAMPLE_NUM_TEST_ROWS) {
            msg.str("");
            msg << "Expecting " << EXAMPLE_NUM_TEST_ROWS << "rows, found " << res->rowsCount();
            throw runtime_error(msg.str());
        }

        /* Fetching data */
        row = 0;
        while (res->next()) {
            cout << "#\t\t Fetching row " << row << "\t";
            /* You can use either numeric offsets... */
            cout << "id = " << res->getInt("id");
            /* ... or column names for accessing results. The latter is recommended. */
            cout << ", task = '" << res->getString("task") << "'" << endl;
            row++;
            system("PAUSE");
        }
    }

... //其余部分不相关，因为它在这里打破了 .

这是输出：

1..1
# Connector/C++ connect basic usage example..
#
#        Test table created
#        Test table populated
#        Running 'SELECT id, task FROM to_do_list ORDER BY id ASC'
#                Number of rows res->rowsCount() = 4
#                Fetching row 0 id = 3, task = ''
Press any key to continue . . .
#                Fetching row 1 id = 7, task = ''
Press any key to continue . . .
   ☼   Ñ╤½x R=  I>             ☼   £I> task  ↕ 4å@ xQ@ ♦   ☼   ☻    ocalhost ½xÇ
'
Press any key to continue . . .

这就是表格看起来很清楚，它不能正常工作 . 我只是无法从MySql获取varchar（120）的字符串：

mysql> use publications
Database changed
mysql> select id, task from to_do_list;
+----+---------------------------+
| id | task                      |
+----+---------------------------+
|  9 | prepare for calculus      |
|  3 | buy jeans                 |
|  8 | buy new scale             |
|  7 | buy Ethics book for class |
+----+---------------------------+
4 rows in set (0.00 sec)

我试过VS2008，这就是我得到的：

msvcp90d.dll！104e8dcb（）[下面的框架可能不正确和/或缺失，没有为msvcp90d.dll加载符号] try_mysql_native.exe！std :: operator <<（std :: basic_ostream>＆os = ，const sql :: SQLString＆str = ）第196行0x1f字节C try_mysql_native.exe！main（int argc = 1，const char * * argv = 0x003e63e8）第115行0xa5字节C try_mysql_native.exe！__ tmainCRTStartup （）第586行0x19字节C try_mysql_native.exe！mainCRTStartup（）第403行C kernel32.dll！7c817077（）

还有这个：

'try_mysql_native.exe'：已加载'C：\ Documents and Settings \ Eugene \ My Documents \ Visual Studio 2008 \ Projects \ try_mysql_native \ Debug \ try_mysql_native.exe'，已加载符号 . 'try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ ntdll.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ kernel32.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ mysqlcppconn.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ libmysql.dll'，已加载符号 . 'try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ advapi32.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ rpcrt4.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ secur32.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ ws2_32.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ msvcrt.dll''try_mysql_native.exe' ：已加载'C：\ WINDOWS \ system32 \ ws2help.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ WinSxS \ x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.30729.4974_x-ww_d889290f \ msvcp90.dll''try_mysql_native.exe' ：已加载'C：\ WINDOWS \ WinSxS \ x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.30729.4974_x-ww_d889290f \ msvcr90.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ WinSxS \ x86_Microsoft.VC90.DebugCRT_1fc8b3b9a1e18e3b_9.0.30729.1_x -ww_f863c71f \ msvcr90d.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ WinSxS \ x86_Microsoft.VC90.DebugCRT_1fc8b3b9a1e18e3b_9.0.30729.1_x-ww_f863c71f \ msvcp90d.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ mswsock.dll''try_mysql_na tive.exe'：已加载'C：\ WINDOWS \ system32 \ dnsapi.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ winrnr.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ wldap32.dll''try_mysql_native.exe'：已加载'C：\ Program Files \ Bonjour \ mdnsNSP.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ iphlpapi.dll''try_mysql_native.exe' ：已加载'C：\ WINDOWS \ system32 \ user32.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ gdi32.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ imm32 . dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ rasadhlp.dll''try_mysql_native.exe'：已加载'C：\ WINDOWS \ system32 \ hnetcfg.dll''try_mysql_native.exe'：已加载'C： \ WINDOWS \ system32 \ wshtcpip.dll在try_mysql_native.exe中的0x104e8dcb处的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb的第一次机会异常：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a . 0x104e8dcb的第一次机会异常在try_mysql_native.exe中：0xC0000005：访问冲突读取位置0x6e61656a . try_mysql_native.exe中0x104e8dcb处的未处理异常：0xC0000005：访问冲突读取位置0x6e61656a .