再用mysql存储过程,网上用c api调用的例子比较少
请问谁有一些调用例子,不胜感激,谢谢
请问谁有一些调用例子,不胜感激,谢谢
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if(!mysql_init(&mysql))
{
printf("mysql_init failed!\n");
return 0;
}
//login or connect
if(!mysql_real_connect(&mysql,"localhost","root","","billingdb",0,NULL,CLIENT_MULTI_STATEMENTS))
{
printf("mysql_real_connect() failed!\n");
mysql_close(&mysql);
return 0;
}
//call
strcpy(query,"call querystudent (1,@ret,@ out_name,@ out_age)");
printf("query sql=[%s]\n",query);
ret= mysql_real_query(&mysql,query,(unsigned int)strlen(query));
ql_query(&mysql, "SELECT @ret,@ out_name,@ out_age ");
//get result
if (ret)
{
printf("Error exec query: %s\n",mysql_error(&mysql));
}
else
{
printf("[%s] exec...\n", query);
}
results = mysql_store_result(&mysql);
while((record = mysql_fetch_row(results))) {
printf("[%s]-[%s]-[%s]\n", record[0], record[1],record[2]);
}
mysql_free_result(results);
mysql_close(&mysql);
A connection to MySQL is established by retrieving an instance of sql::Connection from a sql::mysql::MySQL_Driver object. A sql::mysql::MySQL_Driver object is returned by sql::mysql::MySQL_Driver::get_mysql_driver_instance(). sql::mysql::MySQL_Driver *driver;
sql::Connection *con;driver = sql::mysql::MySQL_Driver::get_mysql_driver_instance();
con = driver->connect("tcp://127.0.0.1:3306", "user", "password");delete con;
Make sure that you free the sql::Connection object as soon as you do not need it any more. But do not explicitly free the connector object!
For running simple queries you can use the methods sql::Statement::execute(), sql::Statement::executeQuery() and sql::Statement::executeUpdate(). The method sql::Statement::execute() should be used if your query does not return a result set or if your query returns more than one result set. See the examples/ directory for more on this. sql::mysql::MySQL_Driver *driver;
sql::Connection *con;
sql::Statement *stmtdriver = sql::mysql::get_mysql_driver_instance();
con = driver->connect("tcp://127.0.0.1:3306", "user", "password");stmt = con->createStatement();
stmt->execute("USE " EXAMPLE_DB);
stmt->execute("DROP TABLE IF EXISTS test");
stmt->execute("CREATE TABLE test(id INT, label CHAR(1))");
stmt->execute("INSERT INTO test(id, label) VALUES (1, 'a')");delete stmt;
delete con;
Note that you have to free sql::Statement and sql::Connection objects explicitly using delete.
The API for fetching result sets is identical for (simple) statments and prepared statements. If your query returns one result set you should use sql::Statement::executeQuery() or sql::PreparedStatement::executeQuery() to run your query. Both methods return sql::ResultSet objects. The preview version does buffer all result sets on the client to support cursors. // ...
sql::Connection *con;
sql::Statement *stmt
sql::ResultSet *res;
// ...
stmt = con->createStatement();
// ...res = stmt->executeQuery("SELECT id, label FROM test ORDER BY id ASC");
while (res->next()) {
// You can use either numeric offsets...
cout << "id = " <&;t; res->getInt(0);
// ... or column names for accessing results. »
The latter is recommended.
cout << ", label = '" << »
res->getString("label") << "'" << endl;
}delete res;
delete stmt;
delete con;
Note that you have to free sql::Statement, sql::Connection and sql::ResultSet objects explicitly using delete. The usage of cursors is demonstrated in the examples contained in the download package.
The following code shows a complete example of how to use MySQL Connector/C++: /* Copyright 2008 Sun Microsystems, Inc.This program is free software; you can redistribute it and/or modify
it under only the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.There are special exceptions to the terms and conditions of the GPL
as it is applied to this software. View the full text of the
exception in file EXCEPTIONS-CONNECTOR-C++ in the directory of this
software distribution.This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*//* Standard C++ includes */
#include <stdlib.h>
#include <iostream>/*
Include directly the different
headers from cppconn/ and mysql_driver.h + mysql_util.h
(and mysql_connection.h). This will reduce your build time!
*/
#include "mysql_connection.h"#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>using namespace std;int main(void)
{
cout << endl;
cout << "Running 'SELECT 'Hello World!' »
AS _message'..." << endl;try {
sql::Driver *driver;
sql::Connection *con;
sql::Statement *stmt;
sql::ResultSet *res; /* Create a connection */
driver = get_driver_instance();
con = driver->connect("tcp://127.0.0.1:3306", "root", "root");
/* Connect to the MySQL test database */
con->setSchema("test"); stmt = con->createStatement();
res = stmt->executeQuery("SELECT 'Hello World!' AS _message");
while (res->next()) {
cout << "\t... MySQL replies: ";
/* Access column data by alias or column name */
cout << res->getString("_message") << endl;
cout << "\t... MySQL says it again: ";
/* Access column fata by numeric offset, 1 is the first column */
cout << res->getString(1) << endl;
}
delete res;
delete stmt;
delete con;} catch (sql::SQLException &e) {
cout << "# ERR: SQLException in " << __FILE__;
cout << "(" << __FUNCTION__ << ") on line " »
<< __LINE__ << endl;
cout << "# ERR: " << e.what();
cout << " (MySQL error code: " << e.getErrorCode();
cout << ", SQLState: " << e.getSQLState() << " )" << endl;
}cout << endl;return EXIT_SUCCESS;
}
The following code shows a complete example of how to use MySQL Connector/C++: /* Copyright 2008 Sun Microsystems, Inc.This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.There are special exceptions to the terms and conditions of the GPL
as it is applied to this software. View the full text of the
exception in file EXCEPTIONS-CONNECTOR-C++ in the directory of this
software distribution.This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*//* Standard C++ includes */
#include <stdlib.h>
#include <iostream>/*
Include directly the different
headers from cppconn/ and mysql_driver.h + mysql_util.h
(and mysql_connection.h). This will reduce your build time!
*/
#include "mysql_connection.h"#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>
#include <cppconn/prepared_statement.h>using namespace std;int main(void)
{
cout << endl;
cout << "Let's have MySQL count from 10 to 1..." << endl;try {
sql::Driver *driver;
sql::Connection *con;
sql::Statement *stmt;
sql::ResultSet *res;
sql::PreparedStatement *pstmt; /* Create a connection */
driver = get_driver_instance();
con = driver->connect("tcp://127.0.0.1:3306", "root", "root");
/* Connect to the MySQL test database */
con->setSchema("test"); stmt = con->createStatement();
stmt->execute("DROP TABLE IF EXISTS test");
stmt->execute("CREATE TABLE test(id INT)");
delete stmt; /* '?' is the supported placeholder syntax */
pstmt = con->prepareStatement("INSERT INTO test(id) VALUES (?)");
for (int i = 1; i <= 10; i++) {
pstmt->setInt(1, i);
pstmt->executeUpdate();
}
delete pstmt; /* Select in ascending order */
pstmt = con->prepareStatement("SELECT id FROM test ORDER BY id ASC");
res = pstmt->executeQuery(); /* Fetch in reverse = descending order! */
res->afterLast();
while (res->previous())
cout << "\t... MySQL counts: " << res->getInt("id") << endl;
delete res; delete pstmt;
delete con;} catch (sql::SQLException &e) {
cout << "# ERR: SQLException in " << __FILE__;
cout << "(" << __FUNCTION__ << ") on line " »
<< __LINE__ << endl;
cout << "# ERR: " << e.what();
cout << " (MySQL error code: " << e.getErrorCode();
cout << ", SQLState: " << e.getSQLState() << »
" )" << endl;
}cout << endl;return EXIT_SUCCESS;
}