有时候变量不初始化，就会导致core dump_成员没有初始化会导致程序core么-优快云博客

本文链接：https://blog.youkuaiyun.com/michaelrun/article/details/8293496

当代码中红色加粗部分被注释时，程序出现core dump情况，可能是因为MySQL在运行过程中使用了未初始化的bind结构体数据，导致不可预测的行为。

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#include <mysql.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{

    int entity_type = 6;
    char* szStrType;
    szStrType = (char*) malloc(20*sizeof(char));
    unsigned long len = strlen(szStrType);
    unsigned long real_len[4];
    real_len[0]=0;

    strcpy(szStrType, "4");

    char szSql[1024];
    char szDbType[30];
    char szDbServer[30];
    char szDbName[30];
    int nPort;
    char szUserName[100];
    char szPassWord[100];

    char szId[100];
    char szAutoCfg[100];
    char szTime1[50];
    char szTime2[50];

    MYSQL_BIND    paramBind[1];
    MYSQL_BIND resultBind[2];

    //memset(resultBind, 0, sizeof(resultBind));
    //memset(paramBind, 0, sizeof(paramBind));

    //strcpy(szSql, "SELECT Price_ID, Auto_Cfg_Child_Price, Effect_Datetime, Expire_Datetime FROM Price_Instance WHERE Entity_Type_ID= ? and Entity_ID = 1");
    strcpy(szSql, "SELECT Price_ID, Price_Name FROM Price_Instance WHERE Entity_Type_ID= ? and Entity_ID = 1");
    strcpy( szDbType, "mysql" );
    strcpy( szDbServer, "110.183.120.8" );
    strcpy( szDbName, "sgb" );
    nPort = 3306;
    strcpy(szUserName, "st_it" );
    strcpy( szPassWord, "sr" );

    MYSQL*   dbHandle=NULL ;
    dbHandle = mysql_init(dbHandle );
    dbHandle = mysql_real_connect(dbHandle, szDbServer,
            szUserName, szPassWord,
            szDbName, nPort , NULL, 0);
    if (NULL == dbHandle )
    {
        return 1;
    }

    MYSQL_STMT* hStmt = mysql_stmt_init(dbHandle);
    if (NULL == hStmt )
    {

        return 1;
    }
    int err = mysql_stmt_prepare(hStmt , szSql, strlen(szSql));

    paramBind[0].buffer_type= MYSQL_TYPE_LONG;
    paramBind[0].buffer= (char *)&entity_type;
    paramBind[0].is_null= 0;
    paramBind[0].length= 0;

    char bErr = mysql_stmt_bind_param( hStmt, paramBind );
    err = mysql_stmt_execute( hStmt );
    memset(szId, 0, sizeof(szId));

    resultBind[0].buffer= (char*)szId;
    resultBind[0].buffer_length= sizeof(szId);
    resultBind[0].buffer_type = MYSQL_TYPE_STRING;
    resultBind[0].length = &real_len[0];

    resultBind[1].buffer= (char*)szAutoCfg;
    resultBind[1].buffer_length= sizeof(szAutoCfg);
    resultBind[1].buffer_type = MYSQL_TYPE_STRING;
    resultBind[1].length = &real_len[1];

    my_bool strerr = mysql_stmt_bind_result(hStmt, resultBind );

    err = mysql_stmt_store_result(hStmt );

    int resultNum =0;
    resultNum = mysql_stmt_num_rows( hStmt );

    err = mysql_stmt_fetch( hStmt );

    mysql_stmt_free_result(hStmt);
    mysql_stmt_close(hStmt);
    mysql_close(dbHandle);
    free(szStrType);
    szStrType = NULL;

    return 0;
}

红色加粗那部分代码如果注释掉，就会导致程序core dump, 是不是mysql会使用其中的bind 结构体中未经初始化的数据呢？