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    db2_special_columns

    (PECL ibm_db2 >= 1.0.0)

    db2_special_columns — Returns a result set listing the unique row identifier columns for a table

    说明

    db2_special_columns(
        resource $connection,
        ?string $qualifier,
        string $schema,
        string $table_name,
        int $scope
    ): resource

    Returns a result set listing the unique row identifier columns 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.

    table_name

    The name of the table.

    scope

    Integer value representing the minimum duration for which the unique row identifier is valid. This can be one of the following values:

    Integer value SQL constant Description
    0 SQL_SCOPE_CURROW Row identifier is valid only while the cursor is positioned on the row.
    1 SQL_SCOPE_TRANSACTION Row identifier is valid for the duration of the transaction.
    2 SQL_SCOPE_SESSION Row identifier is valid for the duration of the connection.

    返回值

    Returns a statement resource with a result set containing rows with unique row identifier information for a table. The rows are composed of the following columns:

    Column name Description
    SCOPE

    Integer value SQL constant Description
    0 SQL_SCOPE_CURROW Row identifier is valid only while the cursor is positioned on the row.
    1 SQL_SCOPE_TRANSACTION Row identifier is valid for the duration of the transaction.
    2 SQL_SCOPE_SESSION Row identifier is valid for the duration of the connection.

    COLUMN_NAME Name of the unique column.
    DATA_TYPE SQL data type for the column.
    TYPE_NAME Character string representation of the SQL 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).
    PSEUDO_COLUMN Always returns 1.

    参见

    • db2_column_privileges() - Returns a result set listing the columns and associated privileges for a table
    • db2_columns() - Returns a result set listing the columns and associated metadata 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_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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