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 |
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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 '%'.
- 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() |