Php/docs/function.db2-columns
db2_columns
(PECL ibm_db2 >= 1.0.0)
db2_columns — Returns a result set listing the columns and associated metadata for a table
说明
db2_columns
( resource $connection
[, string $qualifier
[, string $schema
[, string $table-name
[, string $column-name
]]]] ) : resource
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), |
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 |
CHAR_OCTET_LENGTH | Maximum length in octets for a character data type column, which
matches COLUMN_SIZE for single-byte character set data, or |
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() - Returns a result set listing the columns and associated privileges for a table
- db2_foreign_keys() - Returns a result set listing the foreign keys for a table
- db2_primary_keys() - Returns a result set listing primary keys for a table
- db2_procedure_columns() - Returns a result set listing stored procedure parameters
- db2_procedures() - Returns a result set listing the stored procedures registered in a database
- db2_special_columns() - Returns a result set listing the unique row identifier columns for a table
- db2_statistics() - Returns a result set listing the index and statistics for a table
- db2_table_privileges() - Returns a result set listing the tables and associated privileges in a database
- db2_tables() - Returns a result set listing the tables and associated metadata in a database