---
title: "db_get_field_assoc_float | open.mp"
description: "Get the contents of field as a float with specified name."
canonical: https://omp.itsneufox.com/th/docs/scripting/functions/db_get_field_assoc_float
language: th
---

# db\_get\_field\_assoc\_float

## คำอธิบาย

Get the contents of field as a float with specified name.

| Name | Description |
| --- | --- |
| DBResult:dbresult | The result to get the data from |
| field\[\] | The fieldname to get the data from |

## ส่งคืน

Retrieved value as floating point number.

## ตัวอย่าง

```c
// examples.inc

// ...

Float:Examples_CalculateSum(DB:dbConnectionHandle)
{
    // Return value variable
    new Float:ret;

    // Database result set
    new DBResult:db_result_set = db_query("SELECT `value` FROM `examples`");

    // If database result set is valid
    if (db_result_set)
    {
        // Do operations
        do
        {
            // Add value from "example" field to the return value variable
            ret += db_get_field_assoc_float(db_result_set, "value");
        }

        // While next row could be fetched
        while (db_next_row(db_result_set));

        // Free result set
        db_free_result(db_result_set);
    }

    // Return calculated sum
    return ret;
}
```

```c
// mode.pwn

// ...

#include <examples>

static DB:gDBConnectionHandle;

// ...

public OnGameModeInit()
{
    // ...

    // Create a connection to a database
    gDBConnectionHandle = db_open("example.db");

    // If connection to the database exists
    if (gDBConnectionHandle)
    {
        // Successfully created a connection to the database
        print("Successfully created a connection to database \"example.db\".");
        printf("Calculated sum: %f", Examples_CalculateSum(gDBConnectionHandle));
    }
    else
    {
        // Failed to create a connection to the database
        print("Failed to open a connection to database \"example.db\".");
    }

    // ...

    return 1;
}

public OnGameModeExit()
{
    // Close the connection to the database if connection is open
    if (db_close(gDBConnectionHandle))
    {
        // Extra cleanup
        gDBConnectionHandle = DB:0;
    }

    // ...

    return 1;
}
```

## บันทึก

warning

Using an invalid handle will crash your server! Get a valid handle by using db\_query. But it's protected against NULL references.

## ฟังก์ชั่นที่เกี่ยวข้องกัน

-   db\_open: Open a connection to an SQLite database
-   db\_close: Close the connection to an SQLite database
-   db\_query: Query an SQLite database
-   db\_free\_result: Free result memory from a db\_query
-   db\_num\_rows: Get the number of rows in a result
-   db\_next\_row: Move to the next row
-   db\_num\_fields: Get the number of fields in a result
-   db\_field\_name: Returns the name of a field at a particular index
-   db\_get\_field: Get content of field with specified ID from current result row
-   db\_get\_field\_assoc: Get content of field with specified name from current result row
-   db\_get\_field\_int: Get content of field as an integer with specified ID from current result row
-   db\_get\_field\_assoc\_int: Get content of field as an integer with specified name from current result row
-   db\_get\_field\_float: Get content of field as a float with specified ID from current result row
-   db\_get\_field\_assoc\_float: Get content of field as a float with specified name from current result row
-   db\_get\_mem\_handle: Get memory handle for an SQLite database that was opened with db\_open.
-   db\_get\_result\_mem\_handle: Get memory handle for an SQLite query that was executed with db\_query.
-   db\_debug\_openfiles
-   db\_debug\_openresults