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# db2_columns

(PECL)

db2_columns -- Returns a result set listing the columns and associated metadata for a table

## 説明

resource db2_columns ( resource connection [, string qualifier [, string schema [, string table-name [, string column-name]]]] )

Returns a result set listing the columns and associated metadata for a table.

## パラメータ

connection

  A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.

qualifier

  A qualifier for DB2 databases running on OS/390 or z/OS servers. For other databases, pass `NULL` or an empty string.

schema

  The schema which contains the tables. To match all schemas, pass '%'.

table-name

  The name of the table or view. To match all tables in the database, pass `NULL` or an empty string.

column-name

  The name of the column. To match all columns in the table, pass `NULL` or an empty string.

## 返り値

Returns a statement resource with a result set containing rows describing the columns matching the specified parameters. The rows are composed of the following columns:

Column name | Description
--- | ---
TABLE_CAT | Name of the catalog. The value is NULL if this table does not have catalogs.
TABLE_SCHEM | Name of the schema.
TABLE_NAME | Name of the table or view.
COLUMN_NAME | Name of the column.
DATA_TYPE | The SQL data type for the column represented as an integer value.
TYPE_NAME | A string representing the data type for the column.
COLUMN_SIZE | An integer value representing the size of the column.
BUFFER_LENGTH | Maximum number of bytes necessary to store data from this column.
DECIMAL_DIGITS | The scale of the column, or `NULL` where scale is not applicable.
NUM_PREC_RADIX | An integer value of either 10 (representing an exact numeric data type), 2 (representing an approximate numeric data type), or `NULL` (representing a data type for which radix is not applicable).
NULLABLE | An integer value representing whether the column is nullable or not.
REMARKS | Description of the column.
COLUMN_DEF | Default value for the column.
SQL_DATA_TYPE | An integer value representing the size of the column.
SQL_DATETIME_SUB | Returns an integer value representing a datetime subtype code, or `NULL` for SQL data types to which this does not apply.
CHAR_OCTET_LENGTH | Maximum length in octets for a character data type column, which matches COLUMN_SIZE for single-byte character set data, or `NULL` for non-character data types.
ORDINAL_POSITION | The 1-indexed position of the column in the table.
IS_NULLABLE | A string value where 'YES' means that the column is nullable and 'NO' means that the column is not nullable.

## 参考

db2_column_privileges()
db2_foreign_keys()
db2_primary_keys()
db2_procedure_columns()
db2_procedures()
db2_special_columns()
db2_statistics()
db2_table_privileges()
db2_tables()

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