MySQL C++連接器在調試模式下崩潰

Question

我開始學習mysql C++連接器。 我正在嘗試通過互聯網給出的示例代碼。 但它是隨機崩潰。 它在發佈模式下工作正常。但是當我使用調試模式時，它會崩潰。 我是否需要爲調試模式提供（添加）任何特定的鏈接選項？

/* Standard C++ headers */ 
#include <iostream> 
#include <sstream> 
#include <memory> 
#include <string> 
#include <stdexcept> 

/* MySQL Connector/C++ specific headers */ 
#include <driver.h> 
#include <connection.h> 
#include <statement.h> 
#include <prepared_statement.h> 
#include <resultset.h> 
#include <metadata.h> 
#include <resultset_metadata.h> 
#include <exception.h> 
#include <warning.h> 


#define DBHOST "tcp://127.0.0.1:3306" 
#define USER "vivek" 
#define PASSWORD "vivek" 
#define DATABASE "user2" 

#define NUMOFFSET 100 
#define COLNAME 200 

using namespace std; 
using namespace sql; 


static void retrieve_data_and_print (ResultSet *rs, int type, int colidx, string colname) { 

    /* retrieve the row count in the result set */ 
    cout << "\nRetrieved " << rs -> rowsCount() << " row(s)." << endl; 

    cout << "\nCityName" << endl; 
    cout << "--------" << endl; 

    /* fetch the data : retrieve all the rows in the result set */ 
    while (rs->next()) { 
     if (type == NUMOFFSET) { 
         cout << rs -> getString(colidx) << endl; 
     } else if (type == COLNAME) { 
         cout << rs -> getString(colname) << endl; 
     } // if-else 
    } // while 

    cout << endl; 

} // retrieve_data_and_print() 

static void retrieve_dbmetadata_and_print (Connection *dbcon) { 

    if (dbcon -> isClosed()) { 
     throw runtime_error("DatabaseMetaData FAILURE - database connection closed"); 
    } 

    cout << "\nDatabase Metadata" << endl; 
    cout << "-----------------" << endl; 

    cout << boolalpha; 

    /* The following commented statement won't work with Connector/C++ 1.0.5 and later */ 
    //auto_ptr <DatabaseMetaData> dbcon_meta (dbcon -> getMetaData()); 

    DatabaseMetaData *dbcon_meta = dbcon -> getMetaData(); 

    cout << "Database Product Name: " << dbcon_meta -> getDatabaseProductName() << endl; 
    cout << "Database Product Version: " << dbcon_meta -> getDatabaseProductVersion() << endl; 
    cout << "Database User Name: " << dbcon_meta -> getUserName() << endl << endl; 

    cout << "Driver name: " << dbcon_meta -> getDriverName() << endl; 
    cout << "Driver version: " << dbcon_meta -> getDriverVersion() << endl << endl; 

    cout << "Database in Read-Only Mode?: " << dbcon_meta -> isReadOnly() << endl; 
    cout << "Supports Transactions?: " << dbcon_meta -> supportsTransactions() << endl; 
    cout << "Supports DML Transactions only?: " << dbcon_meta -> supportsDataManipulationTransactionsOnly() << endl; 
    cout << "Supports Batch Updates?: " << dbcon_meta -> supportsBatchUpdates() << endl; 
    cout << "Supports Outer Joins?: " << dbcon_meta -> supportsOuterJoins() << endl; 
    cout << "Supports Multiple Transactions?: " << dbcon_meta -> supportsMultipleTransactions() << endl; 
    cout << "Supports Named Parameters?: " << dbcon_meta -> supportsNamedParameters() << endl; 
    cout << "Supports Statement Pooling?: " << dbcon_meta -> supportsStatementPooling() << endl; 
    cout << "Supports Stored Procedures?: " << dbcon_meta -> supportsStoredProcedures() << endl; 
    cout << "Supports Union?: " << dbcon_meta -> supportsUnion() << endl << endl; 

    cout << "Maximum Connections: " << dbcon_meta -> getMaxConnections() << endl; 
    cout << "Maximum Columns per Table: " << dbcon_meta -> getMaxColumnsInTable() << endl; 
    cout << "Maximum Columns per Index: " << dbcon_meta -> getMaxColumnsInIndex() << endl; 
    cout << "Maximum Row Size per Table: " << dbcon_meta -> getMaxRowSize() << " bytes" << endl; 

    cout << "\nDatabase schemas: " << endl; 

    auto_ptr <ResultSet> rs (dbcon_meta -> getSchemas()); 

    cout << "\nTotal number of schemas = " << rs -> rowsCount() << endl; 
    cout << endl; 

    int row = 1; 

    while (rs -> next()) { 
     cout << "\t" << row << ". " << rs -> getString("TABLE_SCHEM") << endl; 
     ++row; 
    } // while 

    cout << endl << endl; 

} // retrieve_dbmetadata_and_print() 

static void retrieve_rsmetadata_and_print (ResultSet *rs) { 

    if (rs -> rowsCount() == 0) { 
     throw runtime_error("ResultSetMetaData FAILURE - no records in the result set"); 
    } 

    cout << "ResultSet Metadata" << endl; 
    cout << "------------------" << endl; 

    /* The following commented statement won't work with Connector/C++ 1.0.5 and later */ 
    //auto_ptr <ResultSetMetaData> res_meta (rs -> getMetaData()); 

    ResultSetMetaData *res_meta = rs -> getMetaData(); 

    int numcols = res_meta -> getColumnCount(); 
    cout << "\nNumber of columns in the result set = " << numcols << endl << endl; 

    cout.width(20); 
    cout << "Column Name/Label"; 
    cout.width(20); 
    cout << "Column Type"; 
    cout.width(20); 
    cout << "Column Size" << endl; 

    for (int i = 0; i < numcols; ++i) { 
     cout.width(20); 
     cout << res_meta -> getColumnLabel (i+1); 
     cout.width(20); 
     cout << res_meta -> getColumnTypeName (i+1); 
     cout.width(20); 
     cout << res_meta -> getColumnDisplaySize (i+1) << endl << endl; 
    } 

    cout << "\nColumn \"" << res_meta -> getColumnLabel(1); 
    cout << "\" belongs to the Table: \"" << res_meta -> getTableName(1); 
    cout << "\" which belongs to the Schema: \"" << res_meta -> getSchemaName(1) << "\"" << endl << endl; 

} // retrieve_rsmetadata_and_print() 


int main(int argc, const char *argv[]) { 

    Driver *driver; 
    Connection *con; 
    Statement *stmt; 
    ResultSet *res; 
    PreparedStatement *prep_stmt; 
    Savepoint *savept; 

    int updatecount = 0; 

    /* initiate url, user, password and database variables */ 
    string url(argc >= 2 ? argv[1] : DBHOST); 
    const string user(argc >= 3 ? argv[2] : USER); 
    const string password(argc >= 4 ? argv[3] : PASSWORD); 
    const string database(argc >= 5 ? argv[4] : DATABASE); 

    try { 
     driver = get_driver_instance(); 

     /* create a database connection using the Driver */ 
     con = driver -> connect(url, user, password); 

     /* alternate syntax using auto_ptr to create the db connection */ 
     //auto_ptr con (driver -> connect(url, user, password)); 

     /* turn off the autocommit */ 
     con -> setAutoCommit(0); 

     cout << "\nDatabase connection\'s autocommit mode = " << con -> getAutoCommit() << endl; 

     /* select appropriate database schema */ 
     con -> setSchema(database); 

     /* retrieve and display the database metadata */ 
     retrieve_dbmetadata_and_print (con); 

     /* create a statement object */ 
     stmt = con -> createStatement(); 

     cout << "Executing the Query: \"SELECT * FROM City\" .." << endl; 

     /* run a query which returns exactly one result set */ 
     res = stmt -> executeQuery ("show datbases"); 

     cout << "Retrieving the result set .." << endl; 

     /* retrieve the data from the result set and display on stdout */ 
     //retrieve_data_and_print (res, NUMOFFSET, 1, string("CityName")); 


     con -> commit(); 


     /* Clean up */ 
     delete res; 
     delete stmt; 
     delete prep_stmt; 
     con -> close(); 
     delete con; 

    } catch (SQLException &e) { 
     cout << "ERROR: SQLException in " << __FILE__; 
     cout << " (" << __func__<< ") on line " << __LINE__ << endl; 
     cout << "ERROR: " << e.what(); 
     cout << " (MySQL error code: " << e.getErrorCode(); 
     cout << ", SQLState: " << e.getSQLState() << ")" << endl; 

     if (e.getErrorCode() == 1047) { 
      /* 
      Error: 1047 SQLSTATE: 08S01 (ER_UNKNOWN_COM_ERROR) 
      Message: Unknown command 
      */ 
      cout << "\nYour server does not seem to support Prepared Statements at all. "; 
      cout << "Perhaps MYSQL < 4.1?" << endl; 
     } 

     return EXIT_FAILURE; 
    } catch (std::runtime_error &e) { 

     cout << "ERROR: runtime_error in " << __FILE__; 
     cout << " (" << __func__ << ") on line " << __LINE__ << endl; 
     cout << "ERROR: " << e.what() << endl; 

     return EXIT_FAILURE; 
    } 

    return EXIT_SUCCESS; 
} // main() 

Answer 1

我看到一個很可能的錯誤。圖書館正在爲你創造東西，你正在刪除它們。 這可能會使用不同的堆管理器，因此會導致問題。

如果這樣做的話API非常差。它應該爲你提供刪除者。可以？

我發現像這樣的their site，並告訴他們我的想法：

Answer 2

這是因爲該連接器使用不同版本的C++運行時庫比你的應用程序。由連接器創建的對象的初始化與應用程序庫的對象不同。然後當你摧毀這個物體時，你會錯誤地摧毀它。您想要下載連接器的源代碼並自行編譯。

要下載源代碼，請轉到http://www.mysql.com/downloads/connector/cpp/#downloads並選擇平臺類型的「源代碼」。

Answer 3

在調試模式下爲您的庫選擇調試文件夾而不是選擇。