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/*需要的表结构如下
CREATE TABLE `test_data` (
`order_id` BIGINT UNSIGNED NOT NULL COMMENT 'Order numbers. Must be unique.',
`status` BOOL NOT NULL DEFAULT '0' COMMENT 'Whether data has been used or not. A value of 0 means FALSE.',
`date_used` DATETIME NULL COMMENT 'Date/time that the data was used.',
UNIQUE (
    `order_id`
)
) ENGINE = innodb COMMENT = 'LoadRunnertestdata';
*/
Action()
{
int rc;  
int db_connection; //数据库连接
int query_result; // 查询结果集 MySQL_RES
char** result_row; // 查询的数据衕

char *server = "localhost";
char *user = "root";
char *password = "123456";
char *database = "test";
int port = 3306;
int unix_socket = NULL;  
int flags = 0;  

// 找到libmysql.dll的所在位置.
rc = lr_load_dll("C:\\Program Files\\MySQL\\MySQLServer5.1\\bin\\libmysql.dll");
if (rc != 0) {
    lr_error_message("Could not load libmysql.dll");
    lr_abort();
}

// 创建MySQL对象
db_connection = mysql_init(NULL);
if (db_connection == NULL) {
    lr_error_message("Insufficient memory");
    lr_abort();
}

// 连接到MySQL数据库
rc = mysql_real_connect(db_connection, server, user, password, database, port, unix_socket, flags);
if (rc == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 向数据库插入数据
// 此处的 {ORDER_ID} 是一个参数，简单测试时可以用一个常数代替
lr_save_string (lr_eval_string("INSERT INTO test_data (order_id) VALUES ({ORDER_ID})"),"paramInsertQuery");  
rc = mysql_query(db_connection, lr_eval_string("{paramInsertQuery}"));
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 从数据库读取一个数据并显示
rc = mysql_query(db_connection, "SELECT order_id FROM test_data WHERE status IS FALSE LIMIT 1");
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
query_result = mysql_use_result(db_connection);
if (query_result == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
// 如果结果集包含多行数据，需要多次调用 mysql_fetch_row 直到返回NULL
result_row = (char **)mysql_fetch_row(query_result);  
if (result_row == NULL) {
    lr_error_message("Did not expect the result set to be empty");
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
// 保存参数，用于删除这行数据
lr_save_string(result_row[0], "paramOrderID");
lr_output_message("Order ID is: %s", lr_eval_string("{paramOrderID}"));
mysql_free_result(query_result);

// 在事务里更新一行数据，需要用InnoDB引擎
rc = mysql_query(db_connection, "BEGIN"); //启动事务
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
// 使用 "FOR UPDATE" 锁住要更新的数据行
rc = mysql_query(db_connection, "SELECT order_id FROM test_data WHERE status IS FALSE LIMIT 1 FOR UPDATE");  
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
query_result = mysql_use_result(db_connection);
if (query_result == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
result_row = (char **)mysql_fetch_row(query_result);  
if (result_row == NULL) {
    lr_error_message("没有查询到结果");
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
lr_save_string(result_row[0], "paramOrderID");
lr_output_message("Order ID is: %s", lr_eval_string("{paramOrderID}"));
mysql_free_result(query_result);
lr_save_string(lr_eval_string("UPDATE test_data SET status=TRUE, date_used=NOW() WHERE order_id='{paramOrderID}'"),"paramUpdateQuery");
rc = mysql_query(db_connection, lr_eval_string("{paramUpdateQuery}"));
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
rc = mysql_query(db_connection, "COMMIT"); // 提交事务
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 再次查找数据，应该为空了，因为前面的事务更新了标志
rc = mysql_query(db_connection, "SELECT order_id FROM test_data WHERE status IS FALSE LIMIT 1");
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
query_result = mysql_use_result(db_connection);
if (query_result == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
result_row = (char **)mysql_fetch_row(query_result);
if (result_row == NULL) {
    lr_output_message("Result set is empty as expected");
    mysql_free_result(query_result);
} else {
    lr_error_message("Did not expect the result set to contain any rows");
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}

// 删除数据
lr_save_string(lr_eval_string("DELETE FROM test_data WHERE order_id = '{paramOrderID}'"),"paramDeleteQuery");
rc = mysql_query(db_connection, lr_eval_string("{paramDeleteQuery}"));
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 释放MySQL资源
mysql_close(db_connection);
    return 0;
}
/*需要的表结构如下
CREATE TABLE `test_data` (
`order_id` BIGINT UNSIGNED NOT NULL COMMENT 'Order numbers. Must be unique.',
`status` BOOL NOT NULL DEFAULT '0' COMMENT 'Whether data has been used or not. A value of 0 means FALSE.',
`date_used` DATETIME NULL COMMENT 'Date/time that the data was used.',
UNIQUE (
    `order_id`
)
) ENGINE = innodb COMMENT = 'LoadRunner test data';
*/
Action()
{
int rc;
int db_connection; // 数据库连接
int query_result; // 查询结果集 MYSQL_RES
char** result_row; // 查询的数据衕

char *server = "localhost";
char *user = "root";
char *password = "123456";
char *database = "test";
int port = 3306;
int unix_socket = NULL;
int flags = 0;

// 找到libmysql.dll的所在位置.
rc = lr_load_dll("C:\\Program Files\\MySQL\\MySQL Server 5.1\\bin\\libmysql.dll");
if (rc != 0) {
    lr_error_message("Could not load libmysql.dll");
    lr_abort();
}

// 创建MySQL对象
db_connection = mysql_init(NULL);
if (db_connection == NULL) {
    lr_error_message("Insufficient memory");
    lr_abort();
}

// 连接到MySQL数据库
rc = mysql_real_connect(db_connection, server, user, password, database, port, unix_socket, flags);
if (rc == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 向数据库插入数据
// 此处的 {ORDER_ID} 是一个参数，简单测试时可以用一个常数代替
lr_save_string (lr_eval_string("INSERT INTO test_data (order_id) VALUES ({ORDER_ID})"),"paramInsertQuery");
rc = mysql_query(db_connection, lr_eval_string("{paramInsertQuery}"));
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 从数据库读取一个数据并显示
rc = mysql_query(db_connection, "SELECT order_id FROM test_data WHERE status IS FALSE LIMIT 1");
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
query_result = mysql_use_result(db_connection);
if (query_result == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
// 如果结果集包含多行数据，需要多次调用 mysql_fetch_row 直到返回NULL
result_row = (char **)mysql_fetch_row(query_result);
if (result_row == NULL) {
    lr_error_message("Did not expect the result set to be empty");
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
// 保存参数，用于删除这行数据
lr_save_string(result_row[0], "paramOrderID");
lr_output_message("Order ID is: %s", lr_eval_string("{paramOrderID}"));
mysql_free_result(query_result);

// 在事务里更新一行数据，需要用InnoDB引擎
rc = mysql_query(db_connection, "BEGIN"); //启动事务
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
// 使用 "FOR UPDATE" 锁住要更新的数据行
rc = mysql_query(db_connection, "SELECT order_id FROM test_data WHERE status IS FALSE LIMIT 1 FOR UPDATE");
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
query_result = mysql_use_result(db_connection);
if (query_result == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
result_row = (char **)mysql_fetch_row(query_result);
if (result_row == NULL) {
    lr_error_message("没有查询到结果");
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
lr_save_string(result_row[0], "paramOrderID");
lr_output_message("Order ID is: %s", lr_eval_string("{paramOrderID}"));
mysql_free_result(query_result);
lr_save_string(lr_eval_string("UPDATE test_data SET status=TRUE, date_used=NOW() WHERE order_id='{paramOrderID}'"),"paramUpdateQuery");
rc = mysql_query(db_connection, lr_eval_string("{paramUpdateQuery}"));
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
rc = mysql_query(db_connection, "COMMIT"); // 提交事务
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 再次查找数据，应该为空了，因为前面的事务更新了标志
rc = mysql_query(db_connection, "SELECT order_id FROM test_data WHERE status IS FALSE LIMIT 1");
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}
query_result = mysql_use_result(db_connection);
if (query_result == NULL) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}
result_row = (char **)mysql_fetch_row(query_result);
if (result_row == NULL) {
    lr_output_message("Result set is empty as expected");
    mysql_free_result(query_result);
} else {
    lr_error_message("Did not expect the result set to contain any rows");
    mysql_free_result(query_result);
    mysql_close(db_connection);
    lr_abort();
}

// 删除数据
lr_save_string(lr_eval_string("DELETE FROM test_data WHERE order_id = '{paramOrderID}'"),"paramDeleteQuery");
rc = mysql_query(db_connection, lr_eval_string("{paramDeleteQuery}"));
if (rc != 0) {
    lr_error_message("%s", mysql_error(db_connection));
    mysql_close(db_connection);
    lr_abort();
}

// 释放MySQL资源
mysql_close(db_connection);
return 0;
}

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