(PECL ibm_db2 >= 1.0.0)
db2_columns — Returns a result set listing the columns and associated metadata for a table
$connection
[, string $qualifier
[, string $schema
[, string $table-name
[, string $column-name
]]]] ) : resourceReturns a result set listing the columns and associated metadata for a table.
connectionA 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.
schemaThe 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.
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. |
As with previous message, passing null as the last param with db2_columns results in nothing being returned. Passing '%' instead works. The documentation really needs to be updated to correct this error as it's very misleading and was reported as wrong 8 years ago!
must be
db2_columns($conn, '', '%', $table, '%');
Don't forget that table names are UPPERCASE. That gave me quite some headache.
This is not true!
column-name
The name of the column. To match all columns in the table, pass NULL or an empty string.
You should pass '%' to match all columns