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# db2_columns

(no version information, might be only in CVS)

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

## 说明

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

警告
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。使用本函数风险自担。

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

## 参数

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 `NULL` or an empty string.

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.

## 返回值

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.

## 参见

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

后退 | 起点 | 前进
db2_column_privileges | 上一级 | db2_commit