Constants (Microsoft Drivers for PHP for SQL Server)
This topic discusses the constants that are defined by the Microsoft Drivers for PHP for SQL Server.
PDO_SQLSRV Driver Constants
The constants listed on the PDO website are valid in the Microsoft Drivers for PHP for SQL Server.
The following describe the Microsoft-specific constants in the PDO_SQLSRV driver.
Transaction Isolation Level Constants
The TransactionIsolation key, which is used with PDO::__construct, accepts one of the following constants:
PDO::SQLSRV_TXN_READ_UNCOMMITTED
PDO::SQLSRV_TXN_READ_COMMITTED
PDO::SQLSRV_TXN_REPEATABLE_READ
PDO::SQLSRV_TXN_SNAPSHOT
PDO::SQLSRV_TXN_SERIALIZABLE
For more information about the TransactionIsolation key, see Connection Options.
Encoding Constants
The PDO::SQLSRV_ATTR_ENCODING attribute can be passed to PDOStatement::setAttribute, PDO::setAttribute, PDO::prepare, PDOStatement::bindColumn, and PDOStatement::bindParam.
The available values to pass to PDO::SQLSRV_ATTR_ENCODING are
| PDO_SQLSRV driver constant | Description |
|---|---|
| PDO::SQLSRV_ENCODING_BINARY | Data is a raw byte stream from the server without performing encoding or translation. Not valid for PDO::setAttribute. |
| PDO::SQLSRV_ENCODING_SYSTEM | Data is 8-bit characters as specified in the code page of the Windows locale that is set on the system. Any multi-byte characters or characters that do not map into this code page are substituted with a single-byte question mark (?) character. |
| PDO::SQLSRV_ENCODING_UTF8 | Data is in the UTF-8 encoding. This is the default encoding. |
| PDO::SQLSRV_ENCODING_DEFAULT | Uses PDO::SQLSRV_ENCODING_SYSTEM if specified during connection. Use the connection's encoding if specified in a prepare statement. |
Query Timeout
The PDO::SQLSRV_ATTR_QUERY_TIMEOUT attribute is any non-negative integer representing the timeout period, in seconds. Zero (0) is the default and means no timeout.
You can specify the PDO::SQLSRV_ATTR_QUERY_TIMEOUT attribute with PDOStatement::setAttribute, PDO::setAttribute, and PDO::prepare.
Direct or Prepared Execution
You can select direct query execution or prepared statement execution with the PDO::SQLSRV_ATTR_DIRECT_QUERY attribute. PDO::SQLSRV_ATTR_DIRECT_QUERY can be set with PDO::prepare or PDO::setAttribute. For more information about PDO::SQLSRV_ATTR_DIRECT_QUERY, see Direct Statement Execution and Prepared Statement Execution in the PDO_SQLSRV Driver.
Handling Numeric Fetches
The PDO::SQLSRV_ATTR_FETCHES_NUMERIC_TYPE attribute can be used to handle numeric fetches from columns with numeric SQL types (bit, integer, smallint, tinyint, float, and real). When PDO::SQLSRV_ATTR_FETCHES_NUMERIC_TYPE is set to true, the results from an integer column are represented as ints, while SQL floats and reals are represented as floats. This attribute can be set with PDOStatement::setAttribute.
You can modify the default decimal formatting behaviour with the PDO::SQLSRV_ATTR_FORMAT_DECIMALS and PDO::SQLSRV_ATTR_DECIMAL_PLACES attributes. The behaviour of these attributes is identical to the corresponding options on the SQLSRV side (FormatDecimals and DecimalPlaces), except that output params are not supported for formatting. These attributes may be set at either the connection or statement level with PDO::setAttribute or PDOStatement::setAttribute, but any statement attribute will override the corresponding connection attribute. For more details, see Formatting Decimal Strings and Money Values (PDO_SQLSRV Driver).
Handling Date and Time Fetches
The PDO::SQLSRV_ATTR_FETCHES_DATETIME_TYPE specifies whether to retrieve date and time types as PHP DateTime objects. If left false, the default behaviour is to return them as strings. This attribute may be set at either the connection or statement level with PDO::setAttribute or PDOStatement::setAttribute, but the statement attribute will override the corresponding connection attribute. For more information, see How to: Retrieve Date and Time Types as PHP DateTime Objects Using the PDO_SQLSRV Driver.
SQLSRV Driver Constants
The following sections list the constants used by the SQLSRV driver.
ERR Constants
The following table lists the constants that are used to specify if sqlsrv_errors returns errors, warnings, or both.
| Value | Description |
|---|---|
| SQLSRV_ERR_ALL | Errors and warnings generated on the last sqlsrv function call are returned. This is the default value. |
| SQLSRV_ERR_ERRORS | Errors generated on the last sqlsrv function call are returned. |
| SQLSRV_ERR_WARNINGS | Warnings generated on the last sqlsrv function call are returned. |
FETCH Constants
The following table lists the constants that are used to specify the type of array returned by sqlsrv_fetch_array.
| SQLSRV constant | Description |
|---|---|
| SQLSRV_FETCH_ASSOC | sqlsrv_fetch_array returns the next row of data as an associative array. |
| SQLSRV_FETCH_BOTH | sqlsrv_fetch_array returns the next row of data as an array with both numeric and associative keys. This is the default value. |
| SQLSRV_FETCH_NUMERIC | sqlsrv_fetch_array returns the next row of data as a numerically indexed array. |
Logging Constants
This section lists the constants that are used to change the logging settings with sqlsrv_configure. For more information about logging activity, see Logging Activity.
The following table lists the constants that can be used as the value for the LogSubsystems setting:
| SQLSRV constant (integer equivalent in parentheses) | Description |
|---|---|
| SQLSRV_LOG_SYSTEM_ALL (-1) | Turns on logging of all subsystems. |
| SQLSRV_LOG_SYSTEM_CONN (2) | Turns on logging of connection activity. |
| SQLSRV_LOG_SYSTEM_INIT (1) | Turns on logging of initialization activity. |
| SQLSRV_LOG_SYSTEM_OFF (0) | Turns logging off. |
| SQLSRV_LOG_SYSTEM_STMT (4) | Turns on logging of statement activity. |
| SQLSRV_LOG_SYSTEM_UTIL (8) | Turns on logging of error functions activity (such as handle_error and handle_warning). |
The following table lists the constants that can be used as the value for the LogSeverity setting:
| SQLSRV constant (integer equivalent in parentheses) | Description |
|---|---|
| SQLSRV_LOG_SEVERITY_ALL (-1) | Specifies that errors, warnings, and notices will be logged. |
| SQLSRV_LOG_SEVERITY_ERROR (1) | Specifies that errors will be logged. |
| SQLSRV_LOG_SEVERITY_NOTICE (4) | Specifies that notices will be logged. |
| SQLSRV_LOG_SEVERITY_WARNING (2) | Specifies that warnings will be logged. |
Nullable Constants
The following table lists the constants that you can use to determine whether or not a column is nullable or if this information is not available. You can compare the value of the Nullable key that is returned by sqlsrv_field_metadata to determine the column's nullable status.
| SQLSRV constant (integer equivalent in parentheses) | Description |
|---|---|
| SQLSRV_NULLABLE_YES (0) | The column is nullable. |
| SQLSRV_NULLABLE_NO (1) | The column is not nullable. |
| SQLSRV_NULLABLE_UNKNOWN (2) | It is not known if the column is nullable. |
PARAM Constants
The following list contains the constants for specifying parameter direction when you call sqlsrv_query or sqlsrv_prepare.
| SQLSRV constant | Description |
|---|---|
| SQLSRV_PARAM_IN | Indicates an input parameter. |
| SQLSRV_PARAM_INOUT | Indicates a bidirectional parameter. |
| SQLSRV_PARAM_OUT | Indicates an output parameter. |
PHPTYPE Constants
The following table lists the constants that are used to describe PHP data types. For information about PHP data types, see PHP Types.
| SQLSRV constant | PHP data type |
|---|---|
| SQLSRV_PHPTYPE_INT | Integer |
| SQLSRV_PHPTYPE_DATETIME | Datetime |
| SQLSRV_PHPTYPE_FLOAT | Float |
| SQLSRV_PHPTYPE_STREAM($encoding1) | Stream |
| SQLSRV_PHPTYPE_STRING($encoding1) | String |
- SQLSRV_PHPTYPE_STREAM and SQLSRV_PHPTYPE_STRING accept a parameter that specifies the stream encoding. The following table contains the SQLSRV constants that are acceptable parameters, and a description of the corresponding encoding.
| SQLSRV constant | Description |
|---|---|
| SQLSRV_ENC_BINARY | Data is returned as a raw byte stream from the server without performing encoding or translation. |
| SQLSRV_ENC_CHAR | Data is returned in 8-bit characters as specified in the code page of the Windows locale that is set on the system. Any multi-byte characters or characters that do not map into this code page are substituted with a single-byte question mark (?) character. This is the default encoding. |
| "UTF-8" | Data is returned in the UTF-8 encoding. This constant was added in version 1.1 of the Microsoft Drivers for PHP for SQL Server. For more information about UTF-8 support, see How to: Send and Retrieve UTF-8 Data Using Built-In UTF-8 Support. |
Note
When you use SQLSRV_PHPTYPE_STREAM or SQLSRV_PHPTYPE_STRING, the encoding must be specified. If no parameter is supplied, an error will be returned.
For more information about these constants, see How to: Specify PHP Data Types, How to: Retrieve Character Data as a Stream Using the SQLSRV Driver.
SQLTYPE Constants
The following table lists the constants that are used to describe SQL Server data types. Some constants are function-like and may take parameters that correspond to precision, scale, and/or length. When binding parameters, the function-like constants should be used. For type comparisons, the standard (non function-like) constants are required. For information about SQL Server data types, see Data Types (Transact-SQL). For information about precision, scale, and length, see Precision, Scale, and Length (Transact-SQL).
| SQLSRV constant | SQL Server data type |
|---|---|
| SQLSRV_SQLTYPE_BIGINT | bigint |
| SQLSRV_SQLTYPE_BINARY | binary |
| SQLSRV_SQLTYPE_BIT | bit |
| SQLSRV_SQLTYPE_CHAR | char5 |
| SQLSRV_SQLTYPE_CHAR($charCount) | char |
| SQLSRV_SQLTYPE_DATE | date4 |
| SQLSRV_SQLTYPE_DATETIME | datetime |
| SQLSRV_SQLTYPE_DATETIME2 | datetime24 |
| SQLSRV_SQLTYPE_DATETIMEOFFSET | datetimeoffset4 |
| SQLSRV_SQLTYPE_DECIMAL | decimal5 |
| SQLSRV_SQLTYPE_DECIMAL($precision, $scale) | decimal |
| SQLSRV_SQLTYPE_FLOAT | float |
| SQLSRV_SQLTYPE_IMAGE | image1 |
| SQLSRV_SQLTYPE_INT | int |
| SQLSRV_SQLTYPE_MONEY | money |
| SQLSRV_SQLTYPE_NCHAR | nchar5 |
| SQLSRV_SQLTYPE_NCHAR($charCount) | nchar |
| SQLSRV_SQLTYPE_NUMERIC | numeric5 |
| SQLSRV_SQLTYPE_NUMERIC($precision, $scale) | numeric |
| SQLSRV_SQLTYPE_NVARCHAR | nvarchar5 |
| SQLSRV_SQLTYPE_NVARCHAR($charCount) | nvarchar |
| SQLSRV_SQLTYPE_NVARCHAR('max') | nvarchar(MAX) |
| SQLSRV_SQLTYPE_NTEXT | ntext2 |
| SQLSRV_SQLTYPE_REAL | real |
| SQLSRV_SQLTYPE_SMALLDATETIME | smalldatetime |
| SQLSRV_SQLTYPE_SMALLINT | smallint |
| SQLSRV_SQLTYPE_SMALLMONEY | smallmoney |
| SQLSRV_SQLTYPE_TEXT | text3 |
| SQLSRV_SQLTYPE_TIME | time4 |
| SQLSRV_SQLTYPE_TIMESTAMP | timestamp |
| SQLSRV_SQLTYPE_TINYINT | tinyint |
| SQLSRV_SQLTYPE_UNIQUEIDENTIFIER | uniqueidentifier |
| SQLSRV_SQLTYPE_UDT | UDT |
| SQLSRV_SQLTYPE_VARBINARY | varbinary5 |
| SQLSRV_SQLTYPE_VARBINARY($byteCount) | varbinary |
| SQLSRV_SQLTYPE_VARBINARY('max') | varbinary(MAX) |
| SQLSRV_SQLTYPE_VARCHAR | varchar5 |
| SQLSRV_SQLTYPE_VARCHAR($charCount) | varchar |
| SQLSRV_SQLTYPE_VARCHAR('max') | varchar(MAX) |
| SQLSRV_SQLTYPE_XML | xml |
This is a legacy type that maps to the varbinary(max) type.
This is a legacy type that maps to the newer nvarchar type.
This is a legacy type that maps to the newer varchar type.
Support for this type was added in version 1.1 of the Microsoft Drivers for PHP for SQL Server.
These constants should be used in type comparison operations and don't replace the function-like constants with similar syntax. For binding parameters, you should use the function-like constants.
The following table lists the SQLTYPE constants that accept parameters and the range of values allowed for the parameter.
| SQLTYPE | Parameter | Allowable range for parameter |
|---|---|---|
| SQLSRV_SQLTYPE_CHAR, SQLSRV_SQLTYPE_VARCHAR |
charCount | 1 - 8000 |
| SQLSRV_SQLTYPE_NCHAR, SQLSRV_SQLTYPE_NVARCHAR |
charCount | 1 - 4000 |
| SQLSRV_SQLTYPE_BINARY, SQLSRV_SQLTYPE_VARBINARY |
byteCount | 1 - 8000 |
| SQLSRV_SQLTYPE_DECIMAL, SQLSRV_SQLTYPE_NUMERIC |
precision | 1 - 38 |
| SQLSRV_SQLTYPE_DECIMAL, SQLSRV_SQLTYPE_NUMERIC |
scale | 1 - precision |
Transaction Isolation Level Constants
The TransactionIsolation key, which is used with sqlsrv_connect, accepts one of the following constants:
SQLSRV_TXN_READ_UNCOMMITTED
SQLSRV_TXN_READ_COMMITTED
SQLSRV_TXN_REPEATABLE_READ
SQLSRV_TXN_SNAPSHOT
SQLSRV_TXN_SERIALIZABLE
Cursor and Scrolling Constants
The following constants specify the kind of cursor that you can use in a result set:
SQLSRV_CURSOR_FORWARD
SQLSRV_CURSOR_STATIC
SQLSRV_CURSOR_DYNAMIC
SQLSRV_CURSOR_KEYSET
SQLSRV_CURSOR_CLIENT_BUFFERED
The following constants specify which row to select in the result set:
SQLSRV_SCROLL_NEXT
SQLSRV_SCROLL_PRIOR
SQLSRV_SCROLL_FIRST
SQLSRV_SCROLL_LAST
SQLSRV_SCROLL_ABSOLUTE
SQLSRV_SCROLL_RELATIVE
For information on using these constants, see Specifying a Cursor Type and Selecting Rows.
See Also
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