预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

下列常量在执行SQL语句的时候可能被用到。它们可以被传递给cubrid_prepare() 和 cubrid_execute()。

**CUBRID SQL 执行标志**
常量	说明
CUBRID_INCLUDE_OID	Determine whether to get OID during query execution.
CUBRID_ASYNC	Execute the query in asynchronous mode.
CUBRID_EXEC_QUERY_ALL	Execute the query in synchronous mode. This flag must be set when executing multiple SQL statements.

The following constants can be used when fetching the results to specify fetch behaviour. They can be passed to cubrid_fetch() and cubrid_fetch_array().

**CUBRID fetch flags**
Constant	Description
CUBRID_NUM	Get query result as a numeric array (0-default).
CUBRID_ASSOC	Get query result as an associative array.
CUBRID_BOTH	Get query result as both numeric and associative arrays (default value).
CUBRID_OBJECT	Get query result an object.
CUBRID_LOB	The constant CUBRID_LOB can be used when you want to operate the lob object. It can be passed to cubrid_fetch(), cubrid_fetch_row(), cubrid_fetch_array(), cubrid_fetch_assoc() and cubrid_fetch_object().

The following constants can be used when positioning the cursor in query results. They can be passed to or returned by cubrid_move_cursor().

**CUBRID cursor position flags**
Constant	Description
CUBRID_CURSOR_FIRST	Move current cursor to the first position in the result.
CUBRID_CURSOR_CURRENT	Move current cursor as a default value if the origin is not specified.
CUBRID_CURSOR_LAST	Move current cursor to the last position in the result.
CUBRID_CURSOR_SUCCESS	Returned value of cubrid_move_cursor() function in case of success. This flag has been removed from 8.4.1.
CUBRID_NO_MORE_DATA	Returned value of cubrid_move_cursor() function in case of failure. This flag has been removed from 8.4.1.
CUBRID_CURSOR_ERROR	Returned value of cubrid_move_cursor() function in case of failure. This flag has been removed from 8.4.1.

The following constants can be used when setting the auto-commit mode for the database connection. They can be passed to cubrid_set_autocommit() or returned by cubrid_get_autocommit().

**CUBRID auto-commit mode flags**
Constant	Description
CUBRID_AUTOCOMMIT_TRUE	Enable the auto-commit mode.
CUBRID_AUTOCOMMIT_FALSE	Disable the auto-commit mode.

The following constants can be used when setting the database parameter. They can be passed to cubrid_set_db_parameter().

**CUBRID parameter flags**
Constant	Description
CUBRID_PARAM_ISOLATION_LEVEL	Transaction isolation level for the database connection.
CUBRID_PARAM_LOCK_TIMEOUT	Transaction timeout in seconds.

The following constants can be used when setting the transaction isolation level. They can be passed to cubrid_set_db_parameter() or returned by cubrid_get_db_parameter().

**CUBRID isolation level flags**
Constant	Description
TRAN_COMMIT_CLASS_UNCOMMIT_INSTANCE	The lowest isolation level (1). A dirty, non-repeatable or phantom read may occur for the tuple and a non-repeatable read may occur for the table as well.
TRAN_COMMIT_CLASS_COMMIT_INSTANCE	A relatively low isolation level (2). A dirty read does not occur, but non-repeatable or phantom read may occur.
TRAN_REP_CLASS_UNCOMMIT_INSTANCE	The default isolation of CUBRID (3). A dirty, non-repeatable or phantom read may occur for the tuple, but repeatable read is ensured for the table.
TRAN_REP_CLASS_COMMIT_INSTANCE	A relatively low isolation level (4). A dirty read does not occur, but non-repeatable or phantom read may.
TRAN_REP_CLASS_REP_INSTANCE	A relatively high isolation level (5). A dirty or non-repeatable read does not occur, but a phantom read may.
TRAN_SERIALIZABLE	The highest isolation level (6). Problems concerning concurrency (e.g. dirty read, non-repeatable read, phantom read, etc.) do not occur.

The following constants can be used when getting schema information. They can be passed to cubrid_schema().

**CUBRID schema flags**
Constant	Description
CUBRID_SCH_CLASS	Get name and type of table in CUBRID.
CUBRID_SCH_VCLASS	Get name and type of view in CUBRID.
CUBRID_SCH_QUERY_SPEC	Get the query definition of view.
CUBRID_SCH_ATTRIBUTE	Get the attributes of table column.
CUBRID_SCH_CLASS_ATTRIBUTE	Get the attributes of table.
CUBRID_SCH_METHOD	Get the instance method. The instance method is a method called by a class instance. It is used more often than the class method because most operations are executed in the instance.
CUBRID_SCH_CLASS_METHOD	Get the class method. The class method is a method called by a class object. It is usually used to create a new class instance or to initialize it. It is also used to access or update class attributes.
CUBRID_SCH_METHOD_FILE	Get the information of the file where the method of the table is defined.
CUBRID_SCH_SUPERCLASS	Get the name and type of table which table inherites attributes from.
CUBRID_SCH_SUBCLASS	Get the name and type of table which inherites attributes from this table.
CUBRID_SCH_CONSTRAINT	Get the table constraints.
CUBRID_SCH_TRIGGER	Get the table triggers.
CUBRID_SCH_CLASS_PRIVILEGE	Get the privilege information of table.
CUBRID_SCH_ATTR_PRIVILEGE	Get the privilege information of column.
CUBRID_SCH_DIRECT_SUPER_CLASS	Get the direct super table of table.
CUBRID_SCH_PRIMARY_KEY	Get the table primary key.
CUBRID_SCH_IMPORTED_KEYS	Get imported keys of table.
CUBRID_SCH_EXPORTED_KEYS	Get exported keys of table.
CUBRID_SCH_CROSS_REFERENCE	Get reference relationship of tow tables.

The following constants can be used when reporting errors. 在报告错误的时候，下列常量可能被用到。它们可能由cubrid_error_code_facility()返回。

**CUBRID 错误功能代码**
常量	说明
CUBRID_FACILITY_DBMS	The error occurred in CUBRID dbms.
CUBRID_FACILITY_CAS	The error occurred in CUBRID broker cas.
CUBRID_FACILITY_CCI	The error occurred in CUBRID cci.
CUBRID_FACILITY_CLIENT	The error occurred in CUBRID PHP client.

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