Get the requested schema information

# PDO::cubrid_schema

(PECL PDO_CUBRID >= 8.3.0.0001)

PDO::cubrid_schema — Get the requested schema information

### Description

public PDO::cubrid_schema(int `$schema_type`, string `$table_name` = ?, string `$col_name` = ?): array

This function is used to get the requested schema information from database. You have to designate `table_name`, if you want to get information on certain table, `col_name`, if you want to get information on certain column (can be used only with PDO::CUBRID_SCH_COL_PRIVILEGE).

The result of this function is returned as a two-dimensional array (column (associative array) * row (numeric array)). The following tables shows types of schema and the column structure of the result array to be returned based on the schema type.

Result Composition of Each Type
Schema | Column Number | Column Name | Value
--- | --- | --- | ---
PDO::CUBRID_SCH_TABLE | 1 | NAME |
| 2 | TYPE | 0:system table 1:view 2:table
PDO::CUBRID_SCH_VIEW | 1 | NAME |
| 2 | TYPE | 1:view
PDO::CUBRID_SCH_QUERY_SPEC | 1 | QUERY_SPEC |
PDO::CUBRID_SCH_ATTRIBUTE / PDO::CUBRID_SCH_TABLE_ATTRIBUTE | 1 | ATTR_NAME |
| 2 | DOMAIN |
| 3 | SCALE |
| 4 | PRECISION |
| 5 | INDEXED | 1:indexed
| 6 | NOT NULL | 1:not null
| 7 | SHARED | 1:shared
| 8 | UNIQUE | 1:unique
| 9 | DEFAULT |
| 10 | ATTR_ORDER | base:1
| 11 | CLASS_NAME |
| 12 | SOURCE_CLASS |
| 13 | IS_KEY | 1:key
PDO::CUBRID_SCH_METHOD / PDO::CUBRID_SCH_TABLE_METHOD | 1 | NAME |
| 2 | RET_DOMAIN |
| 3 | ARG_DOMAIN |
PDO::CUBRID_SCH_METHOD_FILE | 1 | METHOD_FILE |
PDO::CUBRID_SCH_SUPER_TABLE / PDO::CUBRID_SCH_DIRECT_SUPER_TABLE / PDO::CUBRID_SCH_SUB_TABLE | 1 | CLASS_NAME |
| 2 | TYPE | 0:system table 1:view 2:table
PDO::CUBRID_SCH_CONSTRAINT | 1 | TYPE | 0:unique 1:index 2:reverse unique 3:reverse index
| 2 | NAME |
| 3 | ATTR_NAME |
| 4 | NUM_PAGES |
| 5 | NUM_KEYS |
| 6 | PRIMARY_KEY | 1:primary key
| 7 | KEY_ORDER | base:1
PDO::CUBRID_SCH_TRIGGER | 1 | NAME |
| 2 | STATUS |
| 3 | EVENT |
| 4 | TARGET_CLASS |
| 5 | TARGET_ATTR |
| 6 | ACTION_TIME |
| 7 | ACTION |
| 8 | PRIORITY |
| 9 | CONDITION_TIME |
| 10 | CONDITION |
PDO::CUBRID_SCH_TABLE_PRIVILEGE / PDO::CUBRID_SCH_COL_PRIVILEGE | 1 | CLASS_NAME / ATTR_NAME |
| 2 | PRIVILEGE |
| 3 | GRANTABLE |
PDO::CUBRID_SCH_PRIMARY_KEY | 1 | CLASS_NAME |
| 2 | ATTR_NAME |
| 3 | KEY_SEQ | base:1
| 4 | KEY_NAME |
PDO::CUBRID_SCH_IMPORTED_KEYS / PDO::CUBRID_SCH_EXPORTED_KEYS / PDO::CUBRID_SCH_CROSS_REFERENCE | 1 | PKTABLE_NAME |
| 2 | PKCOLUMN_NAME |
| 3 | FKTABLE_NAME | base:1
| 4 | FKCOLUMN_NAME |
| 5 | KEY_SEQ | base:1
| 6 | UPDATE_ACTION | 0:cascade 1:restrict 2:no action 3:set null
| 7 | DELETE_ACTION | 0:cascade 1:restrict 2:no action 3:set null
| 8 | FK_NAME |
| 9 | PK_NAME |

### Parameters

`schema_type`
  Schema type that you want to know.
`table_name`
  Table you want to know the schema of.
`col_name`
  Column you want to know the schema of.

### Return Values

Array containing the schema information, when process is successful;

FALSE, when process is unsuccessful

### Examples

Example #1 A PDO::cubrid_schema() example

This example shows how to get primary key and foreign keys of table game.

`<?php
$pk_list = $dbh->cubrid_schema(PDO::CUBRID_SCH_PRIMARY_KEY, "game");
print_r($pk_list);
$fk_list = $dbh->cubrid_schema(PDO::CUBRID_SCH_IMPORTED_KEYS, "game");
print_r($fk_list);
?>`

The above example will output:

    Result:
    Array
    (
        [0] => Array
            (
                [CLASS_NAME] => game
                [ATTR_NAME] => athlete_code
                [KEY_SEQ] => 3
                [KEY_NAME] => pk_game_host_year_event_code_athlete_code
            )

        [1] => Array
            (
                [CLASS_NAME] => game
                [ATTR_NAME] => event_code
                [KEY_SEQ] => 2
                [KEY_NAME] => pk_game_host_year_event_code_athlete_code
            )

        [2] => Array
            (
                [CLASS_NAME] => game
                [ATTR_NAME] => host_year
                [KEY_SEQ] => 1
                [KEY_NAME] => pk_game_host_year_event_code_athlete_code
            )

    )
    Array
    (
        [0] => Array
            (
                [PKTABLE_NAME] => athlete
                [PKCOLUMN_NAME] => code
                [FKTABLE_NAME] => game
                [FKCOLUMN_NAME] => athlete_code
                [KEY_SEQ] => 1
                [UPDATE_RULE] => 1
                [DELETE_RULE] => 1
                [FK_NAME] => fk_game_athlete_code
                [PK_NAME] => pk_athlete_code
            )

        [1] => Array
            (
                [PKTABLE_NAME] => event
                [PKCOLUMN_NAME] => code
                [FKTABLE_NAME] => game
                [FKCOLUMN_NAME] => event_code
                [KEY_SEQ] => 1
                [UPDATE_RULE] => 1
                [DELETE_RULE] => 1
                [FK_NAME] => fk_game_event_code
                [PK_NAME] => pk_event_code
            )

    )

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