use mysql client connect remote mysql database with C++

linux/mysql.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <mysql/mysql.h>
+#include <string>
+#include <unistd.h>
+
+const std::string host = "47.100.131.185";
+const std::string user = "jzh";
+const std::string passwd = "a123";
+const std::string db = "gogs";
+const unsigned int port = 3306;
+
+int main()
+{
+    std::cout<<"mysql clientversion: "<<mysql_get_client_info()<<std::endl;
+    MYSQL *my = mysql_init(nullptr);
+    if (nullptr == my) {
+        std::cerr<<"init m=MySQL error"<<std::endl;
+        return 1;
+    }
+    std::cout<<my<<std::endl;
+    if (mysql_real_connect(my, host.c_str(), user.c_str(),passwd.c_str(),db.c_str(), port, nullptr, 0) == nullptr) {
+        std::cout<<"connect MySQL error"<<std::endl;
+        return 2;
+    }
+    //mysql_set_character_set(my, "utf8");
+    std::string cmd = "show tables";
+    int n = mysql_query(my, cmd.c_str());
+    if (n == 0) {
+        std::cout<<cmd<<" success"<<std::endl;
+    } else {
+        std::cout<<cmd<<" fail"<<std::endl;
+    }
+    MYSQL_RES *res = mysql_store_result(my);
+    if (res == nullptr) {
+        std::cout<<"mysql_store_result error"<<std::endl;
+        return 3;
+    }
+    int rows = mysql_num_rows(res);
+    int fields = mysql_num_fields(res);
+    std::cout<<"row = "<<rows<<std::endl;
+    std::cout<<"column = "<<fields<<std::endl;
+    for (int i = 0; i < rows; i++) {
+        MYSQL_ROW row = mysql_fetch_row(res);
+        for (int j = 0; j < fields; j++) {
+            std::cout<<row[j]<<"\t";
+        }
+        std::cout<<"\n";
+    }
+    mysql_free_result(res);
+    mysql_close(my);
+    return 0;
+}