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mormot.db.raw.odbc.pas
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/// Database Framework Low-Level ODBC Access
// - this unit is a part of the Open Source Synopse mORMot framework 2,
// licensed under a MPL/GPL/LGPL three license - see LICENSE.md
unit mormot.db.raw.odbc;
{
*****************************************************************************
Efficient Direct ODBC API Access
- Native ODBC Constants
- Native ODBC Memory Structures
- ODBC Library Loading
*****************************************************************************
}
interface
{$I ..\mormot.defines.inc}
uses
sysutils,
classes,
mormot.core.base,
mormot.core.os,
mormot.core.unicode,
mormot.core.text,
mormot.core.datetime,
mormot.core.rtti,
mormot.core.log,
mormot.db.core,
mormot.db.sql;
{ ************ Native ODBC Constants }
const
SQL_NULL_DATA = -1;
SQL_DATA_AT_EXEC = -2;
SQL_NO_TOTAL = -4;
// return values from functions
SQL_SUCCESS = 0;
SQL_SUCCESS_WITH_INFO = 1;
SQL_NO_DATA = 100;
SQL_PARAM_TYPE_UNKNOWN = 0;
SQL_PARAM_INPUT = 1;
SQL_PARAM_INPUT_OUTPUT = 2;
SQL_RESULT_COL = 3;
SQL_PARAM_OUTPUT = 4;
SQL_RETURN_VALUE = 5;
SQL_PARAM_DATA_AVAILABLE = 101;
SQL_ERROR = -1;
SQL_INVALID_HANDLE = -2;
SQL_STILL_EXECUTING = 2;
SQL_NEED_DATA = 99;
// flags for null-terminated string
SQL_NTS = -3;
SQL_NTSL = -3;
// maximum message length
SQL_MAX_MESSAGE_LENGTH = 512;
// date/time length constants
SQL_DATE_LEN = 10;
// add P+1 if precision is nonzero
SQL_TIME_LEN = 8;
// add P+1 if precision is nonzero
SQL_TIMESTAMP_LEN = 19;
// handle type identifiers
SQL_HANDLE_ENV = 1;
SQL_HANDLE_DBC = 2;
SQL_HANDLE_STMT = 3;
SQL_HANDLE_DESC = 4;
// env attribute
SQL_ATTR_ODBC_VERSION = 200;
SQL_ATTR_CONNECTION_POOLING = 201;
SQL_ATTR_CP_MATCH = 202;
SQL_ATTR_OUTPUT_NTS = 10001;
SQL_OV_ODBC3 = pointer(3);
// values for SQLStatistics()
SQL_INDEX_UNIQUE = 0;
SQL_INDEX_ALL = 1;
SQL_QUICK = 0;
SQL_ENSURE = 1;
// connection attributes
SQL_ACCESS_MODE = 101;
SQL_AUTOCOMMIT = 102;
SQL_LOGIN_TIMEOUT = 103;
SQL_OPT_TRACE = 104;
SQL_OPT_TRACEFILE = 105;
SQL_TRANSLATE_DLL = 106;
SQL_TRANSLATE_OPTION = 107;
SQL_TXN_ISOLATION = 108;
SQL_CURRENT_QUALIFIER = 109;
SQL_ODBC_CURSORS = 110;
SQL_QUIET_MODE = 111;
SQL_PACKET_SIZE = 112;
SQL_ATTR_AUTO_IPD = 10001;
SQL_ATTR_METADATA_ID = 10014;
// statement attributes
SQL_QUERY_TIMEOUT = 0;
SQL_ATTR_APP_ROW_DESC = 10010;
SQL_ATTR_APP_PARAM_DESC = 10011;
SQL_ATTR_IMP_ROW_DESC = 10012;
SQL_ATTR_IMP_PARAM_DESC = 10013;
SQL_ATTR_QUERY_TIMEOUT = SQL_QUERY_TIMEOUT; // ODBC 3.0
SQL_ATTR_CURSOR_SCROLLABLE = -1;
SQL_ATTR_CURSOR_SENSITIVITY = -2;
// SQL_ATTR_CURSOR_SCROLLABLE values
SQL_NONSCROLLABLE = 0;
SQL_SCROLLABLE = 1;
// SQL_AUTOCOMMIT options
SQL_AUTOCOMMIT_OFF = pointer(0);
SQL_AUTOCOMMIT_ON = pointer(1);
// identifiers of fields in the SQL descriptor
SQL_DESC_COUNT = 1001;
SQL_DESC_TYPE = 1002;
SQL_DESC_LENGTH = 1003;
SQL_DESC_OCTET_LENGTH_PTR = 1004;
SQL_DESC_PRECISION = 1005;
SQL_DESC_SCALE = 1006;
SQL_DESC_DATETIME_INTERVAL_CODE = 1007;
SQL_DESC_NULLABLE = 1008;
SQL_DESC_INDICATOR_PTR = 1009;
SQL_DESC_DATA_PTR = 1010;
SQL_DESC_NAME = 1011;
SQL_DESC_UNNAMED = 1012;
SQL_DESC_OCTET_LENGTH = 1013;
SQL_DESC_ALLOC_TYPE = 1099;
// identifiers of fields in the diagnostics area
SQL_DIAG_RETURNCODE = 1;
SQL_DIAG_NUMBER = 2;
SQL_DIAG_ROW_COUNT = 3;
SQL_DIAG_SQLSTATE = 4;
SQL_DIAG_NATIVE = 5;
SQL_DIAG_MESSAGE_TEXT = 6;
SQL_DIAG_DYNAMIC_FUNCTION = 7;
SQL_DIAG_CLASS_ORIGIN = 8;
SQL_DIAG_SUBCLASS_ORIGIN = 9;
SQL_DIAG_CONNECTION_NAME = 10;
SQL_DIAG_SERVER_NAME = 11;
SQL_DIAG_DYNAMIC_FUNCTION_CODE = 12;
// SQL data type codes
SQL_UNKNOWN_TYPE = 0;
SQL_CHAR = 1;
SQL_NUMERIC = 2;
SQL_DECIMAL = 3;
SQL_INTEGER = 4;
SQL_SMALLINT = 5;
SQL_FLOAT = 6;
SQL_REAL = 7;
SQL_DOUBLE = 8;
SQL_DATETIME = 9;
SQL_DATE = 9;
SQL_INTERVAL = 10;
SQL_TIME = 10;
SQL_TIMESTAMP = 11;
SQL_VARCHAR = 12;
SQL_LONGVARCHAR = -1;
SQL_BINARY = -2;
SQL_VARBINARY = -3;
SQL_LONGVARBINARY = -4;
SQL_BIGINT = -5;
SQL_TINYINT = -6;
SQL_BIT = -7;
SQL_WCHAR = -8;
SQL_WVARCHAR = -9;
SQL_WLONGVARCHAR = -10;
SQL_GUID = -11;
// One-parameter shortcuts for date/time data types
SQL_TYPE_DATE = 91;
SQL_TYPE_TIME = 92;
SQL_TYPE_TIMESTAMP = 93;
// C datatype to SQL datatype mapping
SQL_SIGNED_OFFSET = -20;
SQL_UNSIGNED_OFFSET = -22;
SQL_C_CHAR = SQL_CHAR;
SQL_C_WCHAR = SQL_WCHAR;
SQL_C_LONG = SQL_INTEGER;
SQL_C_SHORT = SQL_SMALLINT;
SQL_C_FLOAT = SQL_REAL;
SQL_C_DOUBLE = SQL_DOUBLE;
SQL_C_NUMERIC = SQL_NUMERIC;
SQL_C_DEFAULT = 99;
SQL_C_DATE = SQL_DATE;
SQL_C_TIME = SQL_TIME;
SQL_C_TIMESTAMP = SQL_TIMESTAMP;
SQL_C_TYPE_DATE = SQL_TYPE_DATE;
SQL_C_TYPE_TIME = SQL_TYPE_TIME;
SQL_C_TYPE_TIMESTAMP = SQL_TYPE_TIMESTAMP;
SQL_C_BINARY = SQL_BINARY;
SQL_C_BIT = SQL_BIT;
SQL_C_TINYINT = SQL_TINYINT;
SQL_C_SBIGINT = SQL_BIGINT + SQL_SIGNED_OFFSET;
SQL_C_UBIGINT = SQL_BIGINT + SQL_UNSIGNED_OFFSET;
SQL_C_SLONG = SQL_C_LONG + SQL_SIGNED_OFFSET;
SQL_C_SSHORT = SQL_C_SHORT + SQL_SIGNED_OFFSET;
SQL_C_STINYINT = SQL_TINYINT + SQL_SIGNED_OFFSET;
SQL_C_ULONG = SQL_C_LONG + SQL_UNSIGNED_OFFSET;
SQL_C_USHORT = SQL_C_SHORT + SQL_UNSIGNED_OFFSET;
SQL_C_UTINYINT = SQL_TINYINT + SQL_UNSIGNED_OFFSET;
// Driver specific SQL data type defines.
// Microsoft has -150 thru -199 reserved for Microsoft SQL Server Native
// Client driver usage
SQL_SS_VARIANT = -150;
SQL_SS_UDT = -151;
SQL_SS_XML = -152;
SQL_SS_TABLE = -153;
SQL_SS_TIME2 = -154;
SQL_SS_TIMESTAMPOFFSET = -155;
// Statement attribute values for cursor sensitivity
SQL_UNSPECIFIED = 0;
SQL_INSENSITIVE = 1;
SQL_SENSITIVE = 2;
// GetTypeInfo() request for all data types
SQL_ALL_TYPES = 0;
// Default conversion code for SQLBindCol(), SQLBindParam() and SqlGetData()
SQL_DEFAULT = 99;
// SQLSQLLEN GetData() code indicating that the application row descriptor
// specifies the data type
SQL_ARD_TYPE = -99;
SQL_APD_TYPE = -100;
// SQL date/time type subcodes
SQL_CODE_DATE = 1;
SQL_CODE_TIME = 2;
SQL_CODE_TIMESTAMP = 3;
// CLI option values
SQL_FALSE = 0;
SQL_TRUE = 1;
// values of NULLABLE field in descriptor
SQL_NO_NULLS = 0;
SQL_NULLABLE = 1;
// Value returned by SqlGetTypeInfo() to denote that it is
// not known whether or not a data type supports null values.
SQL_NULLABLE_UNKNOWN = 2;
// Values returned by SqlGetTypeInfo() to show WHERE clause supported
SQL_PRED_NONE = 0;
SQL_PRED_CHAR = 1;
SQL_PRED_BASIC = 2;
// values of UNNAMED field in descriptor
SQL_NAMED = 0;
SQL_UNNAMED = 1;
// values of ALLOC_TYPE field in descriptor
SQL_DESC_ALLOC_AUTO = 1;
SQL_DESC_ALLOC_USER = 2;
// FreeStmt() options
SQL_CLOSE = 0;
SQL_DROP = 1;
SQL_UNBIND = 2;
SQL_RESET_PARAMS = 3;
// Codes used for FetchOrientation in SQLFetchScroll() and SQLDataSources()
SQL_FETCH_NEXT = 1;
SQL_FETCH_FIRST = 2;
// Other codes used for FetchOrientation in SQLFetchScroll()
SQL_FETCH_LAST = 3;
SQL_FETCH_PRIOR = 4;
SQL_FETCH_ABSOLUTE = 5;
SQL_FETCH_RELATIVE = 6;
// SQLEndTran() options
SQL_COMMIT = 0;
SQL_ROLLBACK = 1;
// null handles returned by SQLAllocHandle()
SQL_NULL_HENV = 0;
SQL_NULL_HDBC = 0;
SQL_NULL_HSTMT = 0;
SQL_NULL_HDESC = 0;
// null handle used in place of parent handle when allocating HENV
SQL_NULL_HANDLE = nil;
// Information requested by SqlGetInfo()
SQL_MAX_DRIVER_CONNECTIONS = 0;
SQL_MAXIMUM_DRIVER_CONNECTIONS = SQL_MAX_DRIVER_CONNECTIONS;
SQL_MAX_CONCURRENT_ACTIVITIES = 1;
SQL_MAXIMUM_CONCURRENT_ACTIVITIES = SQL_MAX_CONCURRENT_ACTIVITIES;
SQL_DATA_SOURCE_NAME = 2;
SQL_DRIVER_NAME = 6;
SQL_FETCH_DIRECTION = 8;
SQL_SERVER_NAME = 13;
SQL_SEARCH_PATTERN_ESCAPE = 14;
SQL_DBMS_NAME = 17;
SQL_DBMS_VER = 18;
SQL_ACCESSIBLE_TABLES = 19;
SQL_ACCESSIBLE_PROCEDURES = 20;
SQL_CURSOR_COMMIT_BEHAVIOR = 23;
SQL_DATA_SOURCE_READ_ONLY = 25;
SQL_DEFAULT_TXN_ISOLATION = 26;
SQL_IDENTIFIER_CASE = 28;
SQL_IDENTIFIER_QUOTE_CHAR = 29;
SQL_MAX_COLUMN_NAME_LEN = 30;
SQL_MAXIMUM_COLUMN_NAME_LENGTH = SQL_MAX_COLUMN_NAME_LEN;
SQL_MAX_CURSOR_NAME_LEN = 31;
SQL_MAXIMUM_CURSOR_NAME_LENGTH = SQL_MAX_CURSOR_NAME_LEN;
SQL_MAX_SCHEMA_NAME_LEN = 32;
SQL_MAXIMUM_SCHEMA_NAME_LENGTH = SQL_MAX_SCHEMA_NAME_LEN;
SQL_MAX_CATALOG_NAME_LEN = 34;
SQL_MAXIMUM_CATALOG_NAME_LENGTH = SQL_MAX_CATALOG_NAME_LEN;
SQL_MAX_TABLE_NAME_LEN = 35;
SQL_SCROLL_CONCURRENCY = 43;
SQL_TXN_CAPABLE = 46;
SQL_TRANSACTION_CAPABLE = SQL_TXN_CAPABLE;
SQL_USER_NAME = 47;
SQL_TXN_ISOLATION_OPTION = 72;
SQL_TRANSACTION_ISOLATION_OPTION = SQL_TXN_ISOLATION_OPTION;
SQL_INTEGRITY = 73;
SQL_GETDATA_EXTENSIONS = 81;
SQL_NULL_COLLATION = 85;
SQL_ALTER_TABLE = 86;
SQL_ORDER_BY_COLUMNS_IN_SELECT = 90;
SQL_SPECIAL_CHARACTERS = 94;
SQL_MAX_COLUMNS_IN_GROUP_BY = 97;
SQL_MAXIMUM_COLUMNS_IN_GROUP_BY = SQL_MAX_COLUMNS_IN_GROUP_BY;
SQL_MAX_COLUMNS_IN_INDEX = 98;
SQL_MAXIMUM_COLUMNS_IN_INDEX = SQL_MAX_COLUMNS_IN_INDEX;
SQL_MAX_COLUMNS_IN_ORDER_BY = 99;
SQL_MAXIMUM_COLUMNS_IN_ORDER_BY = SQL_MAX_COLUMNS_IN_ORDER_BY;
SQL_MAX_COLUMNS_IN_SELECT = 100;
SQL_MAXIMUM_COLUMNS_IN_SELECT = SQL_MAX_COLUMNS_IN_SELECT;
SQL_MAX_COLUMNS_IN_TABLE = 101;
SQL_MAX_INDEX_SIZE = 102;
SQL_MAXIMUM_INDEX_SIZE = SQL_MAX_INDEX_SIZE;
SQL_MAX_ROW_SIZE = 104;
SQL_MAXIMUM_ROW_SIZE = SQL_MAX_ROW_SIZE;
SQL_MAX_STATEMENT_LEN = 105;
SQL_MAXIMUM_STATEMENT_LENGTH = SQL_MAX_STATEMENT_LEN;
SQL_MAX_TABLES_IN_SELECT = 106;
SQL_MAXIMUM_TABLES_IN_SELECT = SQL_MAX_TABLES_IN_SELECT;
SQL_MAX_USER_NAME_LEN = 107;
SQL_MAXIMUM_USER_NAME_LENGTH = SQL_MAX_USER_NAME_LEN;
SQL_OJ_CAPABILITIES = 115;
SQL_OUTER_JOIN_CAPABILITIES = SQL_OJ_CAPABILITIES;
// Options for SqlDriverConnect
SQL_DRIVER_NOPROMPT = 0;
SQL_DRIVER_COMPLETE = 1;
SQL_DRIVER_PROMPT = 2;
SQL_DRIVER_COMPLETE_REQUIRED = 3;
// SQLSetStmtAttr SQL Server Native Client driver specific defines.
// Statement attributes
SQL_SOPT_SS_BASE = 1225;
SQL_SOPT_SS_TEXTPTR_LOGGING = SQL_SOPT_SS_BASE + 0; // Text pointer logging
SQL_SOPT_SS_CURRENT_COMMAND = SQL_SOPT_SS_BASE + 1; // dbcurcmd SqlGetStmtOption only
SQL_SOPT_SS_HIDDEN_COLUMNS = SQL_SOPT_SS_BASE + 2; // Expose FOR BROWSE hidden columns
SQL_SOPT_SS_NOBROWSETABLE = SQL_SOPT_SS_BASE + 3; // Set NOBROWSETABLE option
SQL_SOPT_SS_REGIONALIZE = SQL_SOPT_SS_BASE + 4; // Regionalize output character conversions
SQL_SOPT_SS_CURSOR_OPTIONS = SQL_SOPT_SS_BASE + 5; // Server cursor options
SQL_SOPT_SS_NOCOUNT_STATUS = SQL_SOPT_SS_BASE + 6; // Real vs. Not Real row count indicator
SQL_SOPT_SS_DEFER_PREPARE = SQL_SOPT_SS_BASE + 7; // Defer prepare until necessary
SQL_SOPT_SS_QUERYNOTIFICATION_TIMEOUT = SQL_SOPT_SS_BASE + 8; // Notification timeout
SQL_SOPT_SS_QUERYNOTIFICATION_MSGTEXT = SQL_SOPT_SS_BASE + 9; // Notification message text
SQL_SOPT_SS_QUERYNOTIFICATION_OPTIONS = SQL_SOPT_SS_BASE + 10;// SQL service broker name
SQL_SOPT_SS_PARAM_FOCUS = SQL_SOPT_SS_BASE + 11;// Direct subsequent calls to parameter related methods to set properties on constituent columns/parameters of container types
SQL_SOPT_SS_NAME_SCOPE = SQL_SOPT_SS_BASE + 12;// Sets name scope for subsequent catalog function calls
SQL_SOPT_SS_MAX_USED = SQL_SOPT_SS_NAME_SCOPE;
SQL_IS_POINTER = -4;
SQL_IS_UINTEGER = -5;
SQL_IS_INTEGER = -6;
SQL_IS_USMALLINT = -7;
SQL_IS_SMALLINT = -8;
type
SqlSmallint = Smallint;
SqlDate = byte;
SqlTime = byte;
SqlDecimal = byte;
SqlDouble = double;
SqlFloat = double;
SqlInteger = integer;
SqlUInteger = cardinal;
SqlNumeric = byte;
SqlPointer = pointer;
SqlReal = single;
SqlUSmallint = word;
SqlTimestamp = byte;
SqlVarchar = byte;
PSqlSmallint = ^SqlSmallint;
PSqlInteger = ^SqlInteger;
SqlReturn = SqlSmallint;
SqlLen = PtrInt;
SqlULen = PtrUInt;
{$ifdef CPU64}
SqlSetPosIRow = PtrUInt;
{$else}
SqlSetPosIRow = word;
{$endif CPU64}
PSqlLen = ^SqlLen;
SqlHandle = pointer;
SqlHEnv = SqlHandle;
SqlHDbc = SqlHandle;
SqlHStmt = SqlHandle;
SqlHDesc = SqlHandle;
SqlHWnd = LongWord;
{ ************ Native ODBC Memory Structures }
type
{$A-}
/// memory structure used to store SQL_C_TYPE_TIMESTAMP values
{$ifdef USERECORDWITHMETHODS}
SQL_TIMESTAMP_STRUCT = record
{$else}
SQL_TIMESTAMP_STRUCT = object
{$endif USERECORDWITHMETHODS}
public
Year: SqlSmallint;
Month: SqlUSmallint;
Day: SqlUSmallint;
Hour: SqlUSmallint;
Minute: SqlUSmallint;
Second: SqlUSmallint;
Fraction: SqlUInteger;
/// convert an ODBC date and time into TDateTime
// - depending on the original column data type specified, it will return
// either a TDate (for SQL_TYPE_DATE), either a TTime (for SQL_TYPE_TIME),
// either a TDateTime content (for SQL_TYPE_TIMESTAMP)
function ToDateTime(DataType: SqlSmallint = SQL_TYPE_TIMESTAMP): TDateTime;
/// convert an ODBC date and time into its textual expanded ISO-8601
// - will fill up to 21 characters, including double quotes
// - depending on the column data type specified, it will return either an
// ISO-8601 date (for SQL_TYPE_DATE), either a time (for SQL_TYPE_TIME),
// either a full date + time ISO-8601 content (for SQL_TYPE_TIMESTAMP)
function ToIso8601(Dest: PUtf8Char; DataType: SqlSmallint;
WithMS: boolean = false): integer;
/// convert a TDateTime into ODBC date or timestamp
// - returns the corresponding C type, i.e. either SQL_C_TYPE_DATE,
// either SQL_C_TYPE_TIMESTAMP and the corresponding size in bytes
function From(DateTime: TDateTime; var ColumnSize: SqlLen): SqlSmallint;
end;
PSql_TIMESTAMP_STRUCT = ^SQL_TIMESTAMP_STRUCT;
SQL_TIME_STRUCT = record
Hour: SqlUSmallint;
Minute: SqlUSmallint;
Second: SqlUSmallint;
end;
SQL_DATE_STRUCT = record
year: SQLSMALLINT;
month: SQLUSMALLINT;
day: SQLUSMALLINT;
end;
{$A+}
{ ************ ODBC Library Loading }
type
/// generic Exception type, generated for ODBC connection
EOdbcException = class(ESqlDBException);
/// direct access to the ODBC library
// - this wrapper will initialize both Ansi and Wide versions of the ODBC
// driver functions, and will work with 32 bit and 64 bit version of the
// interfaces, on Windows or POSIX platforms
// - within this unit, we will only use Wide version, and UTF-8 conversion
TOdbcLib = class(TSynLibrary)
public
AllocEnv: function (var EnvironmentHandle: SqlHEnv): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
AllocHandle: function(HandleType: SqlSmallint; InputHandle: SqlHandle;
var OutputHandle: SqlHandle): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
AllocStmt: function(ConnectionHandle: SqlHDbc; var StatementHandle: SqlHStmt): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
BindCol: function(StatementHandle: SqlHStmt; ColumnNumber: SqlUSmallint;
TargetType: SqlSmallint; TargetValue: SqlPointer;
BufferLength: SqlLen; StrLen_or_Ind: PSqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
BindParameter: function (StatementHandle: SqlHStmt; ParameterNumber: SqlUSmallint;
InputOutputType, ValueType, ParameterType: SqlSmallint; ColumnSize: SqlULen;
DecimalDigits: SqlSmallint; ParameterValue: SqlPointer; BufferLength: SqlLen;
var StrLen_or_Ind: SqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
Cancel: function(StatementHandle: SqlHStmt): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
CloseCursor: function(StatementHandle: SqlHStmt): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ColAttributeA: function(StatementHandle: SqlHStmt; ColumnNumber: SqlUSmallint;
FieldIdentifier: SqlUSmallint; CharacterAttribute: PAnsiChar;
BufferLength: SqlSmallint; StringLength: PSqlSmallint; NumericAttributePtr: PSqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ColAttributeW: function(StatementHandle: SqlHStmt; ColumnNumber: SqlUSmallint;
FieldIdentifier: SqlUSmallint; CharacterAttribute: PWideChar;
BufferLength: SqlSmallint; StringLength: PSqlSmallint; NumericAttributePtr: PSqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ColumnsA: function(StatementHandle: SqlHStmt;
CatalogName: PAnsiChar; NameLength1: SqlSmallint;
SchemaName: PAnsiChar; NameLength2: SqlSmallint;
TableName: PAnsiChar; NameLength3: SqlSmallint;
ColumnName: PAnsiChar; NameLength4: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ColumnsW: function(StatementHandle: SqlHStmt;
CatalogName: PWideChar; NameLength1: SqlSmallint;
SchemaName: PWideChar; NameLength2: SqlSmallint;
TableName: PWideChar; NameLength3: SqlSmallint;
ColumnName: PWideChar; NameLength4: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
StatisticsA: function(StatementHandle: SqlHStmt;
CatalogName: PAnsiChar; NameLength1: SqlSmallint;
SchemaName: PAnsiChar; NameLength2: SqlSmallint;
TableName: PAnsiChar; NameLength3: SqlSmallint;
Unique, Reserved: SqlUSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
StatisticsW: function(StatementHandle: SqlHStmt;
CatalogName: PWideChar; NameLength1: SqlSmallint;
SchemaName: PWideChar; NameLength2: SqlSmallint;
TableName: PWideChar; NameLength3: SqlSmallint;
Unique, Reserved: SqlUSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ConnectA: function(ConnectionHandle: SqlHDbc;
ServerName: PAnsiChar; NameLength1: SqlSmallint;
UserName: PAnsiChar; NameLength2: SqlSmallint;
Authentication: PAnsiChar; NameLength3: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ConnectW: function(ConnectionHandle: SqlHDbc;
ServerName: PWideChar; NameLength1: SqlSmallint;
UserName: PWideChar; NameLength2: SqlSmallint;
Authentication: PWideChar; NameLength3: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
CopyDesc: function(SourceDescHandle, TargetDescHandle: SqlHDesc): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
DataSourcesA: function(EnvironmentHandle: SqlHEnv; Direction: SqlUSmallint;
ServerName: PAnsiChar; BufferLength1: SqlSmallint; var NameLength1: SqlSmallint;
Description: PAnsiChar; BufferLength2: SqlSmallint; var NameLength2: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
DataSourcesW: function(EnvironmentHandle: SqlHEnv; Direction: SqlUSmallint;
ServerName: PWideChar; BufferLength1: SqlSmallint; var NameLength1: SqlSmallint;
Description: PWideChar; BufferLength2: SqlSmallint; var NameLength2: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
DescribeColA: function(StatementHandle: SqlHStmt; ColumnNumber: SqlUSmallint;
ColumnName: PAnsiChar; BufferLength: SqlSmallint; var NameLength: SqlSmallint;
var DataType: SqlSmallint; var ColumnSize: SqlULen; var DecimalDigits: SqlSmallint;
var Nullable: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
DescribeColW: function(StatementHandle: SqlHStmt; ColumnNumber: SqlUSmallint;
ColumnName: PWideChar; BufferLength: SqlSmallint; var NameLength: SqlSmallint;
var DataType: SqlSmallint; var ColumnSize: SqlULen; var DecimalDigits: SqlSmallint;
var Nullable: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
Disconnect: function(ConnectionHandle: SqlHDbc): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
EndTran: function(HandleType: SqlSmallint; Handle: SqlHandle;
CompletionType: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ErrorA: function(EnvironmentHandle: SqlHEnv; ConnectionHandle: SqlHDbc; StatementHandle: SqlHStmt;
Sqlstate: PAnsiChar; var NativeError: SqlInteger;
MessageText: PAnsiChar; BufferLength: SqlSmallint; var TextLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ErrorW: function(EnvironmentHandle: SqlHEnv; ConnectionHandle: SqlHDbc; StatementHandle: SqlHStmt;
Sqlstate: PWideChar; var NativeError: SqlInteger;
MessageText: PWideChar; BufferLength: SqlSmallint; var TextLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ExecDirectA: function(StatementHandle: SqlHStmt;
StatementText: PAnsiChar; TextLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ExecDirectW: function(StatementHandle: SqlHStmt;
StatementText: PWideChar; TextLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
Execute: function(StatementHandle: SqlHStmt): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
Fetch: function(StatementHandle: SqlHStmt): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
FetchScroll: function(StatementHandle: SqlHStmt;
FetchOrientation: SqlSmallint; FetchOffset: SqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
FreeConnect: function(ConnectionHandle: SqlHDbc): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
FreeEnv: function(EnvironmentHandle: SqlHEnv): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
FreeHandle: function(HandleType: SqlSmallint; Handle: SqlHandle): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
FreeStmt: function(StatementHandle: SqlHStmt; Option: SqlUSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetConnectAttrA: function(ConnectionHandle: SqlHDbc; Attribute: SqlInteger;
ValuePtr: SqlPointer; BufferLength: SqlInteger; pStringLength: pSqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetConnectAttrW: function(ConnectionHandle: SqlHDbc; Attribute: SqlInteger;
ValuePtr: SqlPointer; BufferLength: SqlInteger; pStringLength: pSqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetCursorNameA: function(StatementHandle: SqlHStmt;
CursorName: PAnsiChar; BufferLength: SqlSmallint; var NameLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetCursorNameW: function(StatementHandle: SqlHStmt;
CursorName: PWideChar; BufferLength: SqlSmallint; var NameLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetData: function(StatementHandle: SqlHStmt; ColumnNumber: SqlUSmallint;
TargetType: SqlSmallint; TargetValue: SqlPointer; BufferLength: SqlLen;
StrLen_or_Ind: PSqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDescFieldA: function(DescriptorHandle: SqlHDesc; RecNumber: SqlSmallint;
FieldIdentifier: SqlSmallint; Value: SqlPointer; BufferLength: SqlInteger;
var StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDescFieldW: function(DescriptorHandle: SqlHDesc; RecNumber: SqlSmallint;
FieldIdentifier: SqlSmallint; Value: SqlPointer; BufferLength: SqlInteger;
var StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDescRecA: function(DescriptorHandle: SqlHDesc; RecNumber: SqlSmallint;
Name: PAnsiChar; BufferLength: SqlSmallint; var StringLength: SqlSmallint;
var _Type, SubType: SqlSmallint; var Length: SqlLen;
var Precision, Scale, Nullable: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDescRecW: function(DescriptorHandle: SqlHDesc; RecNumber: SqlSmallint;
Name: PWideChar; BufferLength: SqlSmallint; var StringLength: SqlSmallint;
var _Type, SubType: SqlSmallint; var Length: SqlLen;
var Precision, Scale, Nullable: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDiagFieldA: function(HandleType: SqlSmallint; Handle: SqlHandle;
RecNumber, DiagIdentifier: SqlSmallint;
DiagInfo: SqlPointer; BufferLength: SqlSmallint; var StringLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDiagFieldW: function(HandleType: SqlSmallint; Handle: SqlHandle;
RecNumber, DiagIdentifier: SqlSmallint;
DiagInfo: SqlPointer; BufferLength: SqlSmallint; var StringLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDiagRecA: function(HandleType: SqlSmallint; Handle: SqlHandle; RecNumber: SqlSmallint;
Sqlstate: PAnsiChar; var NativeError: SqlInteger;
MessageText: PAnsiChar; BufferLength: SqlSmallint; var TextLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetDiagRecW: function(HandleType: SqlSmallint; Handle: SqlHandle; RecNumber: SqlSmallint;
Sqlstate: PWideChar; var NativeError: SqlInteger;
MessageText: PWideChar; BufferLength: SqlSmallint; var TextLength: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
MoreResults: function(StatementHandle: SqlHStmt): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
PrepareA: function(StatementHandle: SqlHStmt;
StatementText: PAnsiChar; TextLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
PrepareW: function(StatementHandle: SqlHStmt;
StatementText: PWideChar; TextLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
RowCount: function(StatementHandle: SqlHStmt; var RowCount: SqlLen): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
NumResultCols: function(StatementHandle: SqlHStmt; var ColumnCount: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetInfoA: function(ConnectionHandle: SqlHDbc; InfoType: SqlUSmallint;
InfoValuePtr: SqlPointer; BufferLength: SqlSmallint; StringLengthPtr: PSqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
GetInfoW: function(ConnectionHandle: SqlHDbc; InfoType: SqlUSmallint;
InfoValuePtr: SqlPointer; BufferLength: SqlSmallint; StringLengthPtr: PSqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SetStmtAttrA: function(StatementHandle: SqlHStmt; Attribute: SqlInteger;
Value: SqlPointer; StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SetStmtAttrW: function(StatementHandle: SqlHStmt; Attribute: SqlInteger;
Value: SqlPointer; StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SetEnvAttr: function(EnvironmentHandle: SqlHEnv; Attribute: SqlInteger;
ValuePtr: SqlPointer; StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SetConnectAttrA: function(ConnectionHandle: SqlHDbc; Attribute: SqlInteger;
ValuePtr: SqlPointer; StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SetConnectAttrW: function(ConnectionHandle: SqlHDbc; Attribute: SqlInteger;
ValuePtr: SqlPointer; StringLength: SqlInteger): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
TablesA: function(StatementHandle: SqlHStmt;
CatalogName: PAnsiChar; NameLength1: SqlSmallint;
SchemaName: PAnsiChar; NameLength2: SqlSmallint;
TableName: PAnsiChar; NameLength3: SqlSmallint;
TableType: PAnsiChar; NameLength4: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
TablesW: function(StatementHandle: SqlHStmt;
CatalogName: PWideChar; NameLength1: SqlSmallint;
SchemaName: PWideChar; NameLength2: SqlSmallint;
TableName: PWideChar; NameLength3: SqlSmallint;
TableType: PWideChar; NameLength4: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ForeignKeysA: function(StatementHandle: SqlHStmt;
PKCatalogName: PAnsiChar; NameLength1: SqlSmallint;
PKSchemaName: PAnsiChar; NameLength2: SqlSmallint;
PKTableName: PAnsiChar; NameLength3: SqlSmallint;
FKCatalogName: PAnsiChar; NameLength4: SqlSmallint;
FKSchemaName: PAnsiChar; NameLength5: SqlSmallint;
FKTableName: PAnsiChar; NameLength6: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
ForeignKeysW: function(StatementHandle: SqlHStmt;
PKCatalogName: PWideChar; NameLength1: SqlSmallint;
PKSchemaName: PWideChar; NameLength2: SqlSmallint;
PKTableName: PWideChar; NameLength3: SqlSmallint;
FKCatalogName: PWideChar; NameLength4: SqlSmallint;
FKSchemaName: PWideChar; NameLength5: SqlSmallint;
FKTableName: PWideChar; NameLength6: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SqlDriverConnectA: function(ConnectionHandle: SqlHDbc; WindowHandle: SQLHWnd;
InConnectionString: PAnsiChar; StringLength1: SqlSmallint;
OutConnectionString: PAnsiChar; BufferLength: SqlSmallint;
var StringLength2Ptr: SqlSmallint; DriverCompletion: SqlUSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SqlDriverConnectW: function(ConnectionHandle: SqlHDbc; WindowHandle: SQLHWnd;
InConnectionString: PWideChar; StringLength1: SqlSmallint;
OutConnectionString: PWideChar; BufferLength: SqlSmallint;
var StringLength2Ptr: SqlSmallint; DriverCompletion: SqlUSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SqlProcedureColumnsA: function(StatementHandle: SqlHStmt;
CatalogName: PAnsiChar; NameLength1: SqlSmallint;
SchemaName: PAnsiChar; NameLength2: SqlSmallint;
ProcName: PAnsiChar; NameLength3: SqlSmallint;
ColumnName: PAnsiChar; NameLength4: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SqlProcedureColumnsW: function(StatementHandle: SqlHStmt;
CatalogName: PWideChar; NameLength1: SqlSmallint;
SchemaName: PWideChar; NameLength2: SqlSmallint;
ProcName: PWideChar; NameLength3: SqlSmallint;
ColumnName: PWideChar; NameLength4: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
SqlProcedures: function(StatementHandle: SqlHStmt;
CatalogName: PWideChar; NameLength1: SqlSmallint;
SchemaName: PWideChar; NameLength2: SqlSmallint;
ProcName: PWideChar; NameLength3: SqlSmallint): SqlReturn;
{$ifdef OSWINDOWS} stdcall {$else} cdecl {$endif};
public
/// load the ODBC library
// - and retrieve all SQL*() addresses for ODBC_ENTRIES[] items
constructor Create;
/// raise an exception on error
procedure Check(Conn: TSqlDBConnection; Stmt: TSqlDBStatement; Status: SqlReturn;
HandleType: SqlSmallint; Handle: SqlHandle; InfoRaiseException: boolean = false;
LogLevelNoRaise: TSynLogLevel = sllNone);
{$ifdef HASINLINE}inline;{$endif}
/// generic process of error handle
procedure HandleError(Conn: TSqlDBConnection; Stmt: TSqlDBStatement;
Status: SqlReturn; HandleType: SqlSmallint; Handle: SqlHandle;
InfoRaiseException: boolean; LogLevelNoRaise: TSynLogLevel);
/// wrapper around SqlGetDiagField() API call
function GetDiagField(StatementHandle: SqlHStmt): RawUtf8;
/// wrapper around GetInfo() API call
procedure GetInfoString(ConnectionHandle: SqlHDbc; InfoType: SqlUSmallint;
var Dest: RawUtf8);
end;
var
ODBC: TOdbcLib = nil;
{$ifdef OSWINDOWS}
/// List all ODBC drivers installed, by reading the Windows Registry
// - aDrivers is the output driver list container, which should be either nil (to
// create a new TStringList), or any existing TStrings instance (may be from UI
// - aIncludeVersion: include the DLL driver version as <driver name>=<dll version>
// in aDrivers (somewhat slower)
function OdbcInstalledDriversList(const aIncludeVersion: boolean; var aDrivers: TStrings): boolean;
{$endif OSWINDOWS}
implementation
{$ifdef OSWINDOWS}
uses
Windows,
Registry; // for OdbcInstalledDriversList
{$endif OSWINDOWS}
{ ************ Native ODBC Memory Structures }
{ SQL_TIMESTAMP_STRUCT }
function SQL_TIMESTAMP_STRUCT.From(DateTime: TDateTime;
var ColumnSize: SqlLen): SqlSmallint;
var
Y, MS: word;
begin
DecodeDate(DateTime, Y, Month, Day);
Year := Y;
if frac(DateTime) = 0 then
begin
PInt64(@Hour)^ := 0;
Fraction := 0;
end
else
begin
DecodeTime(DateTime, Hour, Minute, Second, MS);
Fraction := SqlUInteger(MS) * NanoSecsPerMilliSec;
end;
if PInt64(@Hour)^ = 0 then
begin
result := SQL_C_TYPE_DATE;
ColumnSize := SizeOf(SqlUSmallint) * 3;
end
else
begin
result := SQL_C_TYPE_TIMESTAMP;
ColumnSize := SizeOf(SQL_TIMESTAMP_STRUCT);
end;
end;
function SQL_TIMESTAMP_STRUCT.ToDateTime(DataType: SqlSmallint): TDateTime;
var
time: TDateTime;
begin
if DataType = SQL_TYPE_TIME then
result := 0
else
result := EncodeDate(Year, Month, Day);
if (DataType <> SQL_TYPE_DATE) and
(PInt64(@Hour)^ <> 0) and
TryEncodeTime(Hour, Minute, Second, Fraction div 1000000, time) then
result := result + time;
end;
function SQL_TIMESTAMP_STRUCT.ToIso8601(Dest: PUtf8Char; DataType: SqlSmallint;
WithMS: boolean): integer;
begin
Dest^ := '"';
inc(Dest);
if DataType <> SQL_TYPE_TIME then
begin
DateToIso8601PChar(Dest, true, Year, Month, Day);
inc(Dest, 10);
end;
if (DataType <> SQL_TYPE_DATE) and
(PInt64(@Hour)^ <> 0) and
(Hour < 24) and
(Minute < 60) and
(Second < 60) then
begin
// we use 'T' as TJsonWriter.AddDateTime
TimeToIso8601PChar(Dest, true, Hour, Minute, Second, Fraction div 1000000,
'T', WithMS);
if WithMS then
begin
inc(Dest, 13);
result := 25;
end
else
begin
inc(Dest, 9);
result := 21;
end;
end
else
result := 12; // only date
Dest^ := '"';
end;
{ ************ ODBC Library Loading }
const
{$ifdef OSWINDOWS}
ODBC_LIB = 'odbc32.dll';
{$else}
ODBC_LIB = 'libodbc.so.1';
{$endif OSWINDOWS}
ODBC_ENTRIES: array[0..67] of PAnsiChar = (
'AllocEnv',
'AllocHandle',
'AllocStmt',
'BindCol',
'BindParameter',
'Cancel',
'CloseCursor',
'ColAttribute',
'ColAttributeW',
'Columns',
'ColumnsW',
'Statistics',
'StatisticsW',
'Connect',
'ConnectW',
'CopyDesc',
'DataSources',
'DataSourcesW',
'DescribeCol',
'DescribeColW',
'Disconnect',
'EndTran',
'Error',
'ErrorW',
'ExecDirect',
'ExecDirectW',
'Execute',
'Fetch',
'FetchScroll',
'FreeConnect',
'FreeEnv',
'FreeHandle',
'FreeStmt',
'GetConnectAttr',
'GetConnectAttrW',
'GetCursorName',
'GetCursorNameW',
'GetData',
'GetDescField',
'GetDescFieldW',
'GetDescRec',
'GetDescRecW',
'GetDiagField',
'GetDiagFieldW',
'GetDiagRec',
'GetDiagRecW',
'MoreResults',
'Prepare',
'PrepareW',
'RowCount',
'NumResultCols',
'GetInfo',
'GetInfoW',
'SetStmtAttr',
'SetStmtAttrW',
'SetEnvAttr',
'SetConnectAttr',
'SetConnectAttrW',
'Tables',
'TablesW',
'ForeignKeys',
'ForeignKeysW',
'DriverConnect',
'DriverConnectW',
'ProcedureColumnsA',
'ProcedureColumnsW',
'Procedures',
nil);
{$ifdef OSWINDOWS}
function OdbcInstalledDriversList(const aIncludeVersion: boolean;
var aDrivers: TStrings): boolean;
function GetFullFileVersion(const aFileName: TFileName): string;
begin
with TFileVersion.Create(aFileName, 0, 0, 0, 0) do
try // five digits by section for easy version number comparison as string
result := Format('%0.5d.%0.5d.%0.5d.%0.5d', [Major, Minor, Release, Build]);
finally
Free;
end;
end;
var
i: PtrInt;
s: string;
begin
with TRegistry.Create do
try
RootKey := HKEY_LOCAL_MACHINE;
result := OpenKeyReadOnly('Software\ODBC\ODBCINST.INI\ODBC Drivers') or
OpenKeyReadOnly('Software\ODBC\ODBCINST.INI');
if result then
begin
if not Assigned(aDrivers) then
aDrivers := TStringList.Create;
GetValueNames(aDrivers);
if aIncludeVersion then
for i := 0 to aDrivers.Count - 1 do
begin
CloseKey;
result := OpenKeyReadOnly('Software\ODBC\ODBCINST.INI\' + aDrivers[i]);
if result then
begin
// expand environment variable, i.e %windir%