C++和C#访问MySQL的简单代码示例(二)
const char * error = mysql_error(h);
std::cout<<"*** Connection Error " << error << std::endl;
}
do
{
MYSQL_RES* res = mysql_store_result(h);
mysql_free_result(res);
}
while ( (0 == mysql_next_result(h)) );
}
void test_proc_stmt(MYSQL* h)
{
MYSQL* mysql_ = h;
MYSQL_BIND bind;
MYSQL_BIND obind[1];
// test_more_results(mysql_);
MYSQL_STMT *hStmt = mysql_stmt_init(mysql_);
my_bool true_value= 1;
mysql_stmt_attr_set(hStmt, STMT_ATTR_UPDATE_MAX_LENGTH, (void*) &true_value);
char sql[] = "call get_t( )";
//char sql[] = "select id from t where id= ";
if (mysql_stmt_prepare(hStmt, sql, strlen(sql)))
{
std::cout<<__LINE__<<": stmt prepare error: "<< (mysql_stmt_error(hStmt))<
mysql_stmt_reset(hStmt);
if (mysql_stmt_prepare(hStmt, sql, strlen(sql)))
{
std::cout<<__LINE__<<": stmt prepare error: "<< (mysql_stmt_error(hStmt))<
mysql_close(mysql_);
exit( -1);
}
}
int id = 1;
unsigned long id_len = 0;
memset(&bind, 0, sizeof(bind));
bind.buffer_type = FIELD_TYPE_LONG;
bind.buffer = (void*)&id;
bind.is_unsigned = true;
bind.length = &id_len;
// bind[0].buffer_length = sizeof(id);
// bind[0].is_null = 0;
if (mysql_stmt_bind_param(hStmt,(MYSQL_BIND*)(&bind)) != 0)
{
std::cout<<__LINE__<<": stmt prepare error: "<< (mysql_stmt_error(hStmt))<
mysql_close(mysql_);
exit( -1);
}
if (mysql_stmt_execute(hStmt) != 0)
{
std::cout<<__LINE__<<": stmt prepare error: "<< (mysql_stmt_error(hStmt))<
mysql_close(mysql_);
exit( -1);
}
int t2;
memset(obind, 0, sizeof(obind));
obind[0].buffer_type= MYSQL_TYPE_LONG;
obind[0].buffer= (char *)&t2;
obind[0].buffer_length = sizeof(t2);
if (mysql_stmt_bind_result(hStmt, (MYSQL_BIND*)&obind[0]) != 0)
{
std::cout<<__LINE__<<": stmt prepare error: "<< (mysql_stmt_error(hStmt))<
mysql_close(mysql_);
exit( -1);
}
if ( mysql_stmt_store_result(hStmt) != 0 )
{
std::cout<<__LINE__<<": stmt prepare error: "<< (mysql_stmt_error(hStmt))<
mysql_close(mysql_);
exit( -1);
}
int rows = mysql_stmt_num_rows(hStmt);
for (int i=0; i
{
if (mysql_stmt_fetch(hStmt) == 0)
{
std::cout<<"id = "<
}
}
mysql_stmt_free_result(hStmt);
mysql_stmt_close(hStmt);
}
//
// Just for demo only.
//
int main()
{
MYSQL* mysql_ = NULL;
MYSQL_RES* result_ = NULL;
MYSQL_ROW row_;
mysql_ = mysql_init(mysql_);
// if (mysql_real_connect(mysql_, host, user, passwd, db, 3306, NULL, CLIENT_MULTI_STATEMENTS) == NULL)
if (mysql_real_connect(mysql_, host, user, passwd, db, 3306, NULL, CLIENT_MULTI_STATEMENTS) == NULL)
{
const char * error = mysql_error(mysql_);
std::cout<<"*** Connection Error " << error << std::endl;
return -1;
}
mysql_autocommit(mysql_, false);
std::string encodeStr = "set names 'gbk'";
mysql_real_query(mysql_, encodeStr.c_str(), encodeStr.size());
/*
const char* tmpTableName = "t"; // assume you are querying the table 't'
char str[512];
int cnt = 0;
sprintf(str,"select count(*) as cnt from %s", tmpTableName);
mysql_real_query(mysql_, str, strlen(str));
result_ = mysql_store_result(mysql_);
while (row_ = mysql_fetch_row(result_))
{
// get the field value
if (row_[0])
{