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db_num_fields

warning

This function starts with lowercase letter.

คำอธิบาย​

Get the number of fields in a result.

NameDescription
DBResult:dbresultThe result of db_query.

ส่งคืน​

The number of fields in the result.

ตัวอย่าง​

// ...
// Declare "db_result" and select all rows and columns from "spawn_list"
new DBResult:db_result = db_query(db_handle, "SELECT * FROM `spawn_list` WHERE 1;");

// Print the amount of columns selected
printf("Selected columns: %d", db_num_fields(db_result));

// Do...
do
{
    // ...
}

// While next row has been fetched
while(db_next_row(db_handle));

// Frees result
db_free_result(db_result);
// ...

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