oracle

package
v0.0.0-...-65a8ab1 Latest Latest
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 Go to latest Published: Nov 5, 2014 License: Apache-2.0, BSD-3-Clause Imports: 16 Imported by: 0

Documentation

Overview

Package oracle is translated from cx_Oracle ((c) Anthony Tuininga) by Tamás Gulácsi

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

Constants

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const (
	MaxStringChars = 4000
	MaxBinaryBytes = 4000
)

maximum number of characters/bytes applicable to strings/binaries

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const CTrace = false

CTrace is true iff we are printing TRACE messages

Variables

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var (
	//CursorIsClosed prints cursor is closed
	CursorIsClosed = errgo.New("cursor is closed")
	//QueriesNotSupported prints queries not supported
	QueriesNotSupported = errgo.New("queries not supported: results undefined")
	//ListIsEmpty prints list is empty
	ListIsEmpty = errgo.New("list is empty")
)
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var (
	Warning        = &Error{Code: -(1<<30 - 1), Message: "WARNING"}
	NeedData       = &Error{Code: -(1<<30 - 2), Message: "NEED_DATA"}
	NoDataFound    = &Error{Code: -(1<<30 - 3), Message: "NO_DATA_FOUND"}
	StillExecuting = &Error{Code: -(1<<30 - 4), Message: "STILL_EXECUTING"}
	Continue       = &Error{Code: -(1<<30 - 5), Message: "CONTINUE"}
	Other          = &Error{Code: -(1<<30 - 6), Message: "other"}
	InvalidHandle  = &Error{Code: -(1<<30 - 7), Message: "invalid handle"}
)

Error handling

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var (
	//NotImplemented prints not implemented
	NotImplemented = errgo.New("not implemented")
	//ArrayTooLarge prints array too large
	ArrayTooLarge = errgo.New("array too large")
)
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var BypassMultipleArgs = false

BypassMultipleArgs induces a bypass agains ORA-1008 when a keyword is used more than once in the statement It is false by default, as it makes Execute change the statement!

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var CsIDAl32UTF8 C.ub2

CsIDAl32UTF8 holds the charaterset ID for UTF8

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var DefaultArraySize uint = 50

DefaultArraySize is the default array (PL/SQL) size

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var IsDebug bool

IsDebug print debug messages?

Functions

func ClientVersion 

func ClientVersion() []int32

ClientVersion returns the client's version (slice of 5 int32s)

func CountStatementVars 

func CountStatementVars(statement string) map[string]int

CountStatementVars returns a mapping of the variable names found in statement, with the number of occurence as the map value

func FindStatementVars 

func FindStatementVars(statement string) map[string][]int

FindStatementVars returns a mapping of the variable names found in statement, with the number of occurence as the map value

func FromOraText 

func FromOraText(textp *C.OraText, length int) string

FromOraText converts from C.OraText to a string

func MakeDSN 

func MakeDSN(host string, port int, sid, serviceName string) string

MakeDSN makea a data source name given the host port and SID.

func ProgrammingError 

func ProgrammingError(text string) error

ProgrammingError returns a programming error

func SplitDSN 

func SplitDSN(dsn string) (username, password, sid string)

SplitDSN splits username/password@sid

Types

type Connection 

type Connection struct {
	// contains filtered or unexported fields
}

Connection stores the handles for a connection

func NewConnection 

func NewConnection(username, password, dsn string, autocommit bool) (
	conn *Connection, err error)

NewConnection creates a new connection and initializes the connection members.

func (*Connection) AttrSet 

func (conn *Connection) AttrSet(key C.ub4, value unsafe.Pointer, valueLength int) error

AttrSet sets an attribute on the connection identified by key setting value with valueLength length

func (*Connection) Begin 

func (conn *Connection) Begin(formatID int, transactionID, branchID string) error

Begin begins a new transaction on the connection.

func (*Connection) Cancel 

func (conn *Connection) Cancel() error

Cancel executes an OCIBreak() to cause an immediate (asynchronous) abort of any currently executing OCI function.

func (*Connection) Close 

func (conn *Connection) Close() (err error)

Close the connection, disconnecting from the database.

func (*Connection) Commit 

func (conn *Connection) Commit() error

Commit commits the transaction on the connection.

func (*Connection) Connect 

func (conn *Connection) Connect(mode int64, twophase bool) error

Connect to the database. good minimal example: http://www.adp-gmbh.ch/ora/misc/oci/index.html

func (*Connection) Free 

func (conn *Connection) Free(freeEnvironment bool)

Free deallocates the connection, disconnecting from the database if necessary.

func (*Connection) GetEnvironment 

func (conn *Connection) GetEnvironment() Environment

GetEnvironment returns a (non-modifiable) Environment of the connection

func (*Connection) IsConnected 

func (conn *Connection) IsConnected() bool

IsConnected determines if the connection object is connected to the database.

func (*Connection) NewCursor 

func (conn *Connection) NewCursor() *Cursor

NewCursor creates a new cursor (statement) referencing the connection.

func (*Connection) NlsSettings 

func (conn *Connection) NlsSettings(cur *Cursor) (oci, client, database string, err error)

NlsSettings retrieves NLS parameters: OCI charset, client NLS_LANG and database NLS_LANG cur can be nil (in this case it allocates one)

func (*Connection) Ping 

func (conn *Connection) Ping() error

Ping makes a round trip call to the server to confirm that the connection and server are active.

func (*Connection) Prepare 

func (conn *Connection) Prepare() (bool, error)

Prepare commits (if there is anything, TWO-PAHSE) the transaction on the connection.

func (*Connection) Rollback 

func (conn *Connection) Rollback() error

Rollback rolls back the transaction

func (*Connection) ServerAttrSet 

func (conn *Connection) ServerAttrSet(key C.ub4, value unsafe.Pointer, valueLength int) error

ServerAttrSet sets an attribute on the server handle identified by key

func (*Connection) SessionAttrSet 

func (conn *Connection) SessionAttrSet(key C.ub4, value unsafe.Pointer, valueLength int) error

SessionAttrSet sets an attribute on the session handle identified by key

type Cursor 

type Cursor struct {
	// contains filtered or unexported fields
}

Cursor holds the handles for a cursor

func NewCursor 

func NewCursor(conn *Connection) *Cursor

NewCursor creates a new cursor

func (*Cursor) CallFunc 

func (cur *Cursor) CallFunc(
	name string,
	returnType VariableType,
	parameters []interface{},
	keywordParameters map[string]interface{}) (interface{}, error)

CallFunc calls a stored function and return the return value of the function.

func (*Cursor) CallProc 

func (cur *Cursor) CallProc(name string,
	parameters []interface{}, keywordParameters map[string]interface{}) (
	results []interface{}, err error)

CallProc calls a stored procedure and return the (possibly modified) arguments.

func (*Cursor) Close 

func (cur *Cursor) Close()

Close the cursor.

func (*Cursor) Execute 

func (cur *Cursor) Execute(statement string,
	listArgs []interface{}, keywordArgs map[string]interface{}) error

Execute the statement. For pointer-backed Variables, get their values, too.

func (*Cursor) ExecuteMany 

func (cur *Cursor) ExecuteMany(statement string, params []map[string]interface{}) error

ExecuteMany executes the statement many times. The number of times is equivalent to the number of elements in the array of dictionaries.

func (*Cursor) ExecuteManyPrepared 

func (cur *Cursor) ExecuteManyPrepared(numIters uint) error

ExecuteManyPrepared executes the prepared statement the number of times requested. At this point, the statement must have been already prepared and the bind variables must have their values set.

func (*Cursor) FetchAll 

func (cur *Cursor) FetchAll() ([][]interface{}, error)

FetchAll fetches all remaining rows from the cursor.

func (*Cursor) FetchMany 

func (cur *Cursor) FetchMany(rowLimit int) ([][]interface{}, error)

FetchMany fetches multiple rows from the cursor based on the arraysize. for default (arraySize) row limit, use negative rowLimit

func (*Cursor) FetchOne 

func (cur *Cursor) FetchOne() (row []interface{}, err error)

FetchOne fetches a single row from the cursor.

func (*Cursor) FetchOneInto 

func (cur *Cursor) FetchOneInto(row ...interface{}) (err error)

FetchOneInto fetches a single row from the cursor into the given column pointers

func (*Cursor) GetBindNames 

func (cur *Cursor) GetBindNames() ([]string, error)

GetBindNames returns a list of bind variable names.

func (*Cursor) GetDescription 

func (cur *Cursor) GetDescription() (descs []VariableDescription, err error)

GetDescription returns a list of 7-tuples consisting of the description of the define variables.

func (Cursor) GetRowCount 

func (cur Cursor) GetRowCount() int

GetRowCount returns the rowcount of the statement (0 for select, rows affected for DML)

func (*Cursor) IsDDL 

func (cur *Cursor) IsDDL() bool

IsDDL checks whether the cursor is of Data Definition Language

func (*Cursor) IsOpen 

func (cur *Cursor) IsOpen() bool

IsOpen checks whether the cursor is open

func (*Cursor) NewArrayVar 

func (cur *Cursor) NewArrayVar(varType *VariableType, values []interface{}, size uint) (v *Variable, err error)

NewArrayVar creates an array bind variable and return it.

func (*Cursor) NewVar 

func (cur *Cursor) NewVar(value interface{},
) (v *Variable, err error)

NewVar creates a bind variable and returns it. If value is a pointer, then after cur.Execute, data will be returned into it automatically, no need to call v.GetValue.

func (*Cursor) NewVariable 

func (cur *Cursor) NewVariable(numElements uint, varType *VariableType, size uint) (v *Variable, err error)

NewVariable allocates a new variable

func (*Cursor) NewVariableArrayByValue 

func (cur *Cursor) NewVariableArrayByValue(element interface{}, numElements uint) (*Variable, error)

NewVariableArrayByValue allocates a new PL/SQL array by looking at the data

func (*Cursor) NewVariableByValue 

func (cur *Cursor) NewVariableByValue(value interface{}, numElements uint) (v *Variable, err error)

NewVariableByValue is the default method for determining the type of variable to use for the data.

func (*Cursor) Parse 

func (cur *Cursor) Parse(statement string) error

Parse the statement without executing it. This also retrieves information about the select list for select statements.

func (*Cursor) Prepare 

func (cur *Cursor) Prepare(statement, statementTag string) error

Prepare the statement for execution. statementTag is optional

func (*Cursor) SetInputSizesByName 

func (cur *Cursor) SetInputSizesByName(types map[string]VariableType) error

SetInputSizesByName sets the sizes of the bind variables by name (map).

func (*Cursor) SetInputSizesByPos 

func (cur *Cursor) SetInputSizesByPos(types []VariableType) error

SetInputSizesByPos sets the sizes of the bind variables by position (array).

func (*Cursor) SetOutputSize 

func (cur *Cursor) SetOutputSize(outputSize, outputSizeColumn int)

SetOutputSize sets the size of all of the long columns or just one of them. use -1 for outputSizeColumn if set outputSize for all columns!

func (*Cursor) String 

func (cur *Cursor) String() string

String implements Stringer on Cursor

type Environment 

type Environment struct {
	MaxBytesPerCharacter uint
	FixedWidth           bool
	Encoding, Nencoding  string
	// contains filtered or unexported fields
}

Environment holds handles for the database environment

func NewEnvironment 

func NewEnvironment() (*Environment, error)

NewEnvironment creates and initializes a new environment object

func (*Environment) AttrGet 

func (env *Environment) AttrGet(parent unsafe.Pointer, parentType, key int,
	dst unsafe.Pointer, errText string) (int, error)

AttrGet gets the parent's attribute identified by key, and stores it in dst

func (*Environment) AttrGetName 

func (env *Environment) AttrGetName(parent unsafe.Pointer, parentType, key int,
	errText string) ([]byte, error)

AttrGetName retrieves the name of the parent's attribute identified by key

func (*Environment) AttrSet 

func (env *Environment) AttrSet(parent unsafe.Pointer, parentTyp C.ub4,
	key C.ub4, value unsafe.Pointer, valueLength int) error

AttrSet sets an attribute on the given parent pointer

func (*Environment) CheckStatus 

func (env *Environment) CheckStatus(status C.sword, at string) error

CheckStatus checks for an error in the last call and if an error has occurred, retrieve the error message from the database environment

func (*Environment) Free 

func (env *Environment) Free() error

Free frees the used handles

func (*Environment) FromEncodedString 

func (env *Environment) FromEncodedString(text []byte) string

FromEncodedString returns string decoded from Oracle's representation

func (*Environment) GetCharacterSetName 

func (env *Environment) GetCharacterSetName(attribute uint32) (string, error)

GetCharacterSetName retrieves the IANA character set name for the attribute.

type Error 

type Error struct {
	Code    int
	Message string
	At      string
	Offset  int
}

Error is an error struct holding additional info

func NewError 

func NewError(code int, message string) *Error

NewError creates a new error, pointing to the code with the given message

func NewErrorAt 

func NewErrorAt(code int, message, at string) *Error

NewErrorAt creates a new error, pointing to the code with the given message

func (Error) Error 

func (err Error) Error() string

Error returns a string representation of the error (implenets error)

func (Error) String 

func (err Error) String() string

String prints a nice(er) error message (implements Stringer)

type ExternalLobVar 

type ExternalLobVar struct {
	// contains filtered or unexported fields
}

ExternalLobVar is an external LOB var type

func NewExternalLobVar 

func NewExternalLobVar(v *Variable,
	pos uint,
) *ExternalLobVar

NewExternalLobVar creates a new external LOB variable.

func (*ExternalLobVar) Close 

func (lv *ExternalLobVar) Close() error

Close the LOB.

func (*ExternalLobVar) FileExists 

func (lv *ExternalLobVar) FileExists() (bool, error)

FileExists returns a boolean indicating if the BFIILE lob exists.

func (*ExternalLobVar) GetChunkSize 

func (lv *ExternalLobVar) GetChunkSize() (int, error)

GetChunkSize returns the chunk size that should be used when reading/writing the LOB in chunks.

func (*ExternalLobVar) GetFileName 

func (lv *ExternalLobVar) GetFileName() (string, string, error)

GetFileName returns the directory alias and file name for the BFILE lob.

func (*ExternalLobVar) IsOpen 

func (lv *ExternalLobVar) IsOpen() (bool, error)

IsOpen returns a boolean indicating if the lob is open or not.

func (*ExternalLobVar) Open 

func (lv *ExternalLobVar) Open() error

Open the LOB to speed further accesses.

func (*ExternalLobVar) Read 

func (lv *ExternalLobVar) Read(p []byte) (int, error)

Read returns a portion (or all) of the data in the external LOB variable.

func (*ExternalLobVar) ReadAll 

func (lv *ExternalLobVar) ReadAll() ([]byte, error)

ReadAll returns all of the data in the external LOB variable.

func (*ExternalLobVar) ReadAt 

func (lv *ExternalLobVar) ReadAt(p []byte, off int64) (int, error)

ReadAt returns a portion (or all) of the data in the external LOB variable.

func (*ExternalLobVar) SetFileName 

func (lv *ExternalLobVar) SetFileName(dirAlias, name string) error

SetFileName sets the directory alias and file name for the BFILE lob.

func (*ExternalLobVar) Size 

func (lv *ExternalLobVar) Size(inChars bool) (int64, error)

Size returns the size of the data in the LOB variable.

func (*ExternalLobVar) String 

func (lv *ExternalLobVar) String() string

String returns a short representation of the ExternalLobVar

func (*ExternalLobVar) Trim 

func (lv *ExternalLobVar) Trim(newSize int) error

Trim the LOB variable to the specified length.

func (*ExternalLobVar) Verify 

func (lv *ExternalLobVar) Verify() error

Verify that the external LOB var is still valid.

func (*ExternalLobVar) WriteAt 

func (lv *ExternalLobVar) WriteAt(value []byte, off int64) (n int, err error)

WriteAt writes a value to the LOB variable; return the number of bytes written.

type OraTyper 

type OraTyper interface {
	GetVarType() *VariableType
}

OraTyper is a Go => Oracle type conversion interface

type Variable 

type Variable struct {
	// contains filtered or unexported fields
}

Variable holds the handles for a variable

func (Variable) ArrayLength 

func (v Variable) ArrayLength() uint

ArrayLength returns the number of allocated elements (array length for arrays)

func (*Variable) Bind 

func (v *Variable) Bind(cur *Cursor, name string, pos uint) error

Bind allocates a variable and bind it to the given statement. bind to name or pos

func (*Variable) Free 

func (v *Variable) Free()

Free an existing variable.

func (*Variable) GetValue 

func (v *Variable) GetValue(arrayPos uint) (interface{}, error)

GetValue returns the value of the variable.

func (*Variable) GetValueInto 

func (v *Variable) GetValueInto(dest *interface{}, arrayPos uint) error

GetValueInto inserts the value of the variable into the given pointer

func (*Variable) Len 

func (v *Variable) Len() int

Len returns the array's actual length

func (*Variable) SetValue 

func (v *Variable) SetValue(arrayPos uint, value interface{}) error

SetValue sets the value of the variable. If value is a pointer, then v will put its gained data into it.

func (*Variable) String 

func (v *Variable) String() string

String returns a (short) representation of the variable

type VariableDescription 

type VariableDescription struct {
	Name                                              string
	Type, InternalSize, DisplaySize, Precision, Scale int
	NullOk                                            bool
}

VariableDescription holds the description of a variable

type VariableType 

type VariableType struct {
	Name string
	// contains filtered or unexported fields
}

VariableType holds data for a variable 

var (
	//DateTimeVarType is the variable type for DateTime
	DateTimeVarType *VariableType
	//IntervalVarType is the variable type for Interval
	IntervalVarType *VariableType
)
var (
	//ClobVarType is a VariableType for CLOB
	ClobVarType *VariableType
	//NClobVarType is a VariableType for NCLOB
	NClobVarType *VariableType
	//BlobVarType is a VariableType for BLOB
	BlobVarType *VariableType
	//BFileVarType is a VariableType for BFILE
	BFileVarType *VariableType
)
var (
	//LongStringVarType is a VariableType for LONG strings
	LongStringVarType *VariableType
	//LongBinaryVarType is a VariableType for RAW strings
	LongBinaryVarType *VariableType
)
var (
	//FloatVarType is a VariableType for floats
	FloatVarType *VariableType
	//NativeFloatVarType is a VariableType for native floatss
	NativeFloatVarType *VariableType
	//Int32VarType is a VariableType for int32s
	Int32VarType *VariableType
	//Int64VarType is a VariableType for int64s
	Int64VarType *VariableType
	//LongIntegerVarType is a VariableType for long ints
	LongIntegerVarType *VariableType
	//NumberAsStringVarType is a VariableType for numbers represented as strings
	NumberAsStringVarType *VariableType
	//BooleanVarType is a VariableType for bools
	BooleanVarType *VariableType
)
var (
	//StringVarType is a VariableType for VARCHAR2
	StringVarType *VariableType
	//FixedCharVarType is a VariableType for CHAR
	FixedCharVarType *VariableType
	//BinaryVarType is a VariableType for RAW
	BinaryVarType *VariableType
	//RowidVarType is a VariableType for ROWID
	RowidVarType *VariableType
)
var CursorVarType *VariableType

CursorVarType is the VariableType for a cursor

func VarTypeByValue 

func VarTypeByValue(data interface{}) (vt *VariableType, size uint, numElements uint, err error)

VarTypeByValue returns a variable type given a Go object or error if the Go value does not have a corresponding variable type.

func (*VariableType) IsBinary 

func (t *VariableType) IsBinary() bool

IsBinary returns whether the VariableType is a binary type

func (*VariableType) IsDate 

func (t *VariableType) IsDate() bool

IsDate checks whether the variable type is Date or Interval

func (*VariableType) IsFloat 

func (t *VariableType) IsFloat() bool

IsFloat returns whether the VariableType represents a float

func (*VariableType) IsInteger 

func (t *VariableType) IsInteger() bool

IsInteger returns whether the VariableType represents an integer

func (*VariableType) IsNumber 

func (t *VariableType) IsNumber() bool

IsNumber returns whether the VariableType represents a number

func (*VariableType) IsString 

func (t *VariableType) IsString() bool

IsString returns whether the VariableType is a string type

func (*VariableType) NewVariable 

func (t *VariableType) NewVariable(cur *Cursor, numElements uint, size uint) (*Variable, error)

NewVariable returns a new Variable of the given VariableType

func (*VariableType) String 

func (t *VariableType) String() string

String returns a string representation of the VariableType

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