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), `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() - 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

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User Contributed Notes 3 notes

down

Anonymous ¶

7 years ago


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!

down

david dot rekowski at gmx dot de ¶

13 years ago


must be

db2_columns($conn, '', '%', $table, '%');


Don't forget that table names are UPPERCASE. That gave me quite some headache.

down

lada(at)hoidekr.net ¶

15 years ago


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

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db2_columns

说明

参数

返回值

参见

User Contributed Notes 3 notes