MySQL C++连接器

Question

我正在使用MySQL/C++连接器。
我试图通过“d3l”在这个question
提供的解决方案然后我得到这个错误：

 
tester.cpp: In function ‘int main()’: 
tester.cpp:12:20: warning: variable ‘con’ set but not used [-Wunused-but-set-variable] 
    sql::Connection *con; 
        ^
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::affected_rows(st_mysql*)': 
(.text+0x164): undefined reference to `mysql_affected_rows' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::autocommit(st_mysql*, char)': 
(.text+0x18d): undefined reference to `mysql_autocommit' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::close(st_mysql*)': 
(.text+0x1ac): undefined reference to `mysql_close' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::commit(st_mysql*)': 
(.text+0x1ca): undefined reference to `mysql_commit' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::data_seek(st_mysql_res*, unsigned long long)': 
(.text+0x1f3): undefined reference to `mysql_data_seek' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::debug(char const*)': 
(.text+0x212): undefined reference to `mysql_debug' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::mysql_errno(st_mysql*)': 
(.text+0x230): undefined reference to `mysql_errno' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::error(st_mysql*)': 
(.text+0x24e): undefined reference to `mysql_error' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::fetch_field(st_mysql_res*)': 
(.text+0x26c): undefined reference to `mysql_fetch_field' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::fetch_field_direct(st_mysql_res*, unsigned int)': 
(.text+0x292): undefined reference to `mysql_fetch_field_direct' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::fetch_lengths(st_mysql_res*)': 
(.text+0x2b0): undefined reference to `mysql_fetch_lengths' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::fetch_row(st_mysql_res*)': 
(.text+0x2ce): undefined reference to `mysql_fetch_row' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::field_count(st_mysql*)': 
(.text+0x2ec): undefined reference to `mysql_field_count' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::free_result(st_mysql_res*)': 
(.text+0x30a): undefined reference to `mysql_free_result' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::get_client_version()': 
(.text+0x31d): undefined reference to `mysql_get_client_version' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::get_server_info(st_mysql*)': 
(.text+0x33c): undefined reference to `mysql_get_server_info' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::get_server_version(st_mysql*)': 
(.text+0x35a): undefined reference to `mysql_get_server_version' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::info(st_mysql*)': 
(.text+0x378): undefined reference to `mysql_info' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::init(st_mysql*)': 
(.text+0x396): undefined reference to `mysql_init' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::library_init(int, char**, char**)': 
(.text+0x3c4): undefined reference to `mysql_server_init' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::library_end()': 
(.text+0x3d7): undefined reference to `mysql_server_end' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::more_results(st_mysql*)': 
(.text+0x3f6): undefined reference to `mysql_more_results' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::next_result(st_mysql*)': 
(.text+0x414): undefined reference to `mysql_next_result' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::num_fields(st_mysql_res*)': 
(.text+0x432): undefined reference to `mysql_num_fields' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::num_rows(st_mysql_res*)': 
(.text+0x450): undefined reference to `mysql_num_rows' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::options(st_mysql*, mysql_option, void const*)': 
(.text+0x47e): undefined reference to `mysql_options' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::query(st_mysql*, char const*)': 
(.text+0x4a7): undefined reference to `mysql_query' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::ping(st_mysql*)': 
(.text+0x4c6): undefined reference to `mysql_ping' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::real_connect(st_mysql*, char const*, char const*, char const*, char const*, unsigned int, char const*, unsigned long)': 
(.text+0x519): undefined reference to `mysql_real_connect' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::real_escape_string(st_mysql*, char*, char const*, unsigned long)': 
(.text+0x550): undefined reference to `mysql_real_escape_string' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::real_query(st_mysql*, char const*, unsigned long)': 
(.text+0x581): undefined reference to `mysql_real_query' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::rollback(st_mysql*)': 
(.text+0x5a0): undefined reference to `mysql_rollback' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::sqlstate(st_mysql*)': 
(.text+0x5be): undefined reference to `mysql_sqlstate' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::ssl_set(st_mysql*, char const*, char const*, char const*, char const*, char const*)': 
(.text+0x603): undefined reference to `mysql_ssl_set' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::store_result(st_mysql*)': 
(.text+0x622): undefined reference to `mysql_store_result' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::use_result(st_mysql*)': 
(.text+0x640): undefined reference to `mysql_use_result' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::warning_count(st_mysql*)': 
(.text+0x65e): undefined reference to `mysql_warning_count' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_affected_rows(st_mysql_stmt*)': 
(.text+0x67c): undefined reference to `mysql_stmt_affected_rows' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_attr_set(st_mysql_stmt*, enum_stmt_attr_type, void const*)': 
(.text+0x6aa): undefined reference to `mysql_stmt_attr_set' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_bind_param(st_mysql_stmt*, st_mysql_bind*)': 
(.text+0x6d3): undefined reference to `mysql_stmt_bind_param' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_bind_result(st_mysql_stmt*, st_mysql_bind*)': 
(.text+0x6fd): undefined reference to `mysql_stmt_bind_result' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_close(st_mysql_stmt*)': 
(.text+0x71c): undefined reference to `mysql_stmt_close' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_data_seek(st_mysql_stmt*, unsigned long long)': 
(.text+0x745): undefined reference to `mysql_stmt_data_seek' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_errno(st_mysql_stmt*)': 
(.text+0x764): undefined reference to `mysql_stmt_errno' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_error(st_mysql_stmt*)': 
(.text+0x782): undefined reference to `mysql_stmt_error' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_execute(st_mysql_stmt*)': 
(.text+0x7a0): undefined reference to `mysql_stmt_execute' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_fetch(st_mysql_stmt*)': 
(.text+0x7be): undefined reference to `mysql_stmt_fetch' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_field_count(st_mysql_stmt*)': 
(.text+0x7dc): undefined reference to `mysql_stmt_field_count' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_init(st_mysql*)': 
(.text+0x7fa): undefined reference to `mysql_stmt_init' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_num_rows(st_mysql_stmt*)': 
(.text+0x818): undefined reference to `mysql_stmt_num_rows' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_param_count(st_mysql_stmt*)': 
(.text+0x836): undefined reference to `mysql_stmt_param_count' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_prepare(st_mysql_stmt*, char const*, unsigned long)': 
(.text+0x867): undefined reference to `mysql_stmt_prepare' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_result_metadata(st_mysql_stmt*)': 
(.text+0x886): undefined reference to `mysql_stmt_result_metadata' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_send_long_data(st_mysql_stmt*, unsigned int, char const*, unsigned long)': 
(.text+0x8ba): undefined reference to `mysql_stmt_send_long_data' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_sqlstate(st_mysql_stmt*)': 
(.text+0x8d8): undefined reference to `mysql_stmt_sqlstate' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::stmt_store_result(st_mysql_stmt*)': 
(.text+0x8f6): undefined reference to `mysql_stmt_store_result' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::thread_end()': 
(.text+0x909): undefined reference to `mysql_thread_end' 
/usr/lib/libmysqlcppconn.a(mysql_client_api.cpp.o): In function `sql::mysql::NativeAPI::LibmysqlStaticProxy::thread_init()': 
(.text+0x91d): undefined reference to `mysql_thread_init' 
collect2: error: ld returned 1 exit status 

我运行Ubuntu 14.
请帮助。

编辑：
作为“mukunda”说：
“通常连接器/ C++已经静态链接到的libmysql，即构建源时的默认设置”

所以我编译：

须藤克++ -Wall -I/USR /包含/ cppconn -o testapp tester.cpp

然后错误是红色uced只：

 
tester.cpp: In function ‘int main()’: 
tester.cpp:12:20: warning: variable ‘con’ set but not used [-Wunused-but-set-variable] 
    sql::Connection *con; 
        ^
/tmp/ccSdYfYy.o: In function `main': 
tester.cpp:(.text+0xa): undefined reference to `get_driver_instance' 
collect2: error: ld returned 1 exit status 

再次编辑：
这是为了建立这个代码的必要步骤：

#include <stdlib.h> 
#include <iostream> 
#include <mysql_connection.h> 
#include <driver.h> 
#include <exception.h> 
#include <resultset.h> 
#include <statement.h> 

using namespace sql; 
int main(void){ 
    sql::Driver *driver; 
    sql::Connection *con; 

    driver = get_driver_instance(); 
    con = driver->connect("tcp://127.0.0.1:3306","root","YOURPASSWORD"); 

    return 0; 
} 

 
1. Install mysqlcppconn : sudo apt-get install libmysqlcppconn-dev 
2. Install mysqlclient : sudo apt-get install libmysqlclient-dev libmysqlclient18 
3. Compile it in terminal using : 
    sudo g++ -Wall -I/usr/include/cppconn -o testapp tester.cpp -L/usr/lib -lmysqlcppconn -lmysqlclient 

感谢的迈克和比芬。

Answer 1

libmysqlcppconn只是libmysqlclient的C++包装器。您需要将它们链接起来才能使其工作（以及任何其他依赖关系）。