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db_field_name

warning

This function starts with lowercase letter.

คำอธิบาย​

Returns the name of a field at a particular index.

NameDescription
DBResult:dbresultThe result to get the data from; returned by db_query.
fieldThe index of the field to get the name of.
result[]The result.
maxlengthThe max length of the field.

ส่งคืน​

Returns 1, if the function was successful, otherwise 0 if DBResult:dbresult is a NULL reference or the column index not available.

ตัวอย่าง​

// Callback
public OnPlayerCommandText(playerid, cmdtext[])
{
    // If "cmdtext" equals "/getfieldnames"
    if (!strcmp(cmdtext, "/getfieldnames", true, 14))
    {
        // Declare "db_result", "i", and "columns"
        new DBResult:db_result = db_query(db_handle, "SELECT * FROM `join_log`"), i, columns = db_num_fields(db_result), info[30];

        // Iterate from 0 to "columns-1"
        for(; i < columns; i++)
        {
            // Store the name of the i indexed column name into "info"
            db_field_name(db_result, i, info, sizeof info);

            // Print "info"
            printf("Field name: %s", info);
        }

        // Frees the result
        db_free_result(db_result);

        // Returns 1
        return 1;
    }

    // Returns 0
    return 0;
}

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