goracle

package module
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 Go to latest Published: Feb 15, 2018 License: Apache-2.0 Imports: 19 Imported by: 0

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goracle

goracle is a package which is a database/sql/driver.Driver for connecting to Oracle DB, using Anthony Tuininga's excellent OCI wrapper, ODPI-C.

At least Go 1.9 is required!

Connect

In sql.Open("goracle", connString), you can provide the classic "user/passw@sid" as connString, or an URL like "oracle://user:passw@sid".

You can provide all possible options with ConnectionParams.

Rationale

With Go 1.9, driver-specific things are not needed, everything (I need) can be achieved with the standard database/sql library. Even calling stored procedures with OUT parameters, or sending/retrieving PL/SQL array types - just give a goracle.PlSQLArrays Option within the parameters of Exec!

The array size of the returned PL/SQL arrays can be set with goracle.ArraySize(2000)

  • the default is 1024.

Connections are pooled by default (except AS SYSOPER or AS SYSDBA).

Speed

Correctness and simplicity is more important than speed, but the underlying ODPI-C library helps a lot with the lower levels, so the performance is not bad.

Queries are prefetched (256 rows by default, can be changed by adding a goracle.FetchRowCount(1000) argument to the call of Query), but you can speed up INSERT/UPDATE/DELETE statements by providing all the subsequent parameters at once, by putting each param's subsequent elements in a separate slice:

Instead of

db.Exec("INSERT INTO table (a, b) VALUES (:1, :2)", 1, "a")
db.Exec("INSERT INTO table (a, b) VALUES (:1, :2)", 2, "b")

do

db.Exec("INSERT INTO table (a, b) VALUES (:1, :2)", []int{1, 2}, []string{"a", "b"})

.

Logging

Goracle uses github.com/go-kit/kit/log's concept of a Log function. Either set goracle.Log to a logging function globally, or (better) set the logger in the Context of ExecContext or QueryContext:

db.QueryContext(goracle.ContextWithLog(ctx, logger.Log), qry)

Tracing

To set ClientIdentifier, ClientInfo, Module, Action and DbOp on the session, to be seen in the Database by the Admin, set goracle.TraceTag on the Context:

db.QueryContext(goracle.ContextWithTraceTag(goracle.TraceTag{
	Module: "processing",
	Action: "first",
}), qry)

Extras

To use the goracle-specific functions, you'll need a *goracle.conn. That's what goracle.DriverConn is for! See z_qrcn_test.go for using that to reach NewSubscription.

Install

Just

go get gopkg.in/goracle.v2

and you're ready to go!

Windows may need some newer gcc (mingw-w64 with gcc 7.2.0).

Contribute

Just as with other Go projects, you don't want to change the import paths, but you can hack on the library in place, just set up different remotes:

cd $GOPATH.src/gopkg.in/goracle.v2
git remote add upstream https://github.com/go-goracle/goracle.git
git fetch upstream
git checkout -b master upstream/master

git checkout -f master
git pull upstream master
git remote add fork git@github.com:mygithubacc/goracle
git checkout -b newfeature upstream/master

Change, experiment as you wish, then

git commit -m 'my great changes' *.go
git push fork newfeature

and you're ready to send a GitHub Pull Request from github.com/mygithubacc/goracle, newfeature branch.

As the ODPI-C sources are included as git submodule, don't forget to

git submodule update --init
# or
go generate

to update ODPI-C, too. If you want to refresh ODPI-C, you can:

cd odpi
git pull
cd ..
git add odpi
git commit -m 'upgrade odpi to <git commit hash of odpi>' odpi
pre-commit

Add this to .git/hooks/pre-commit

#!/bin/sh
set -e

output="$(gofmt -l "$@")"

if [ -n "$output" ]; then
	echo >&2 "Go files must be formatted with gofmt. Please run:"
	for f in $output; do
		echo >&2 "  gofmt -w $PWD/$f"
	done
	exit 1
fi

for file in "$@"; do
	go vet "$file"
done

gometalinter --vendor --disable-all \
  --enable=deadcode \
  --enable=ineffassign \
  --enable=gosimple \
  --enable=staticcheck \
  --enable=unused \
  --enable=vetshadow \
  ./...

Third-party

  • oracall generates a server for calling stored procedures.

Documentation

Overview

Package goracle is a database/sql/driver for Oracle DB.

The connection string for the sql.Open("goracle", connString) call can be the simple 

loin/password@sid [AS SYSDBA|AS SYSOPER]

type (with sid being the sexp returned by tnsping), or in the form of 

ora://login:password@sid/? \
  sysdba=0& \
  sysoper=0& \
  poolMinSessions=1& \
  poolMaxSessions=1000& \
  poolIncrement=1& \
  connectionClass=POOLED

These are the defaults. Many advocate that a static session pool (min=max, incr=0) is better, with 1-10 sessions per CPU thread. See http://docs.oracle.com/cd/E82638_01/JJUCP/optimizing-real-world-performance.htm#JJUCP-GUID-BC09F045-5D80-4AF5-93F5-FEF0531E0E1D

If you specify connectionClass, that'll reuse the same session pool without the connectionClass, but will specify it on each session acquire. Thus you can cluster the session pool with classes, or ose POOLED for DRCP.

Index

Constants

View Source 
const (
	// DefaultFetchRowCount is the number of prefetched rows by default (if not changed through FetchRowCount statement option).
	DefaultFetchRowCount = 1 << 8

	// DefaultArraySize is the length of the maximum PL/SQL array by default (if not changed through ArraySize statement option).
	DefaultArraySize = 1 << 10
)
View Source 
const (
	// DpiMajorVersion is the wanted major version of the underlying ODPI-C library.
	DpiMajorVersion = C.DPI_MAJOR_VERSION
	// DpiMinorVersion is the wanted minor version of the underlying ODPI-C library.
	DpiMinorVersion = C.DPI_MINOR_VERSION

	// DriverName is set on the connection to be seen in the DB
	DriverName = "gopkg.in/goracle.v2 : " + Version

	// DefaultPoolMinSessions specifies the default value for minSessions for pool creation.
	DefaultPoolMinSessions = 1
	// DefaultPoolMaxSessions specifies the default value for maxSessions for pool creation.
	DefaultPoolMaxSessions = 1000
	// DefaultPoolIncrement specifies the default value for increment for pool creation.
	DefaultPoolIncrement = 1
	// DefaultConnectionClass is the defailt connectionClass
	DefaultConnectionClass = "GORACLE"
)
View Source 
const (
	EvtStartup     = EventType(C.DPI_EVENT_STARTUP)
	EvtShutdown    = EventType(C.DPI_EVENT_SHUTDOWN)
	EvtShutdownAny = EventType(C.DPI_EVENT_SHUTDOWN_ANY)
	EvtDropDB      = EventType(C.DPI_EVENT_DROP_DB)
	EvtDereg       = EventType(C.DPI_EVENT_DEREG)
	EvtObjChange   = EventType(C.DPI_EVENT_OBJCHANGE)
	EvtQueryChange = EventType(C.DPI_EVENT_QUERYCHANGE)
)

Events that can be watched.

View Source 
const (
	// OpAll Indicates that notifications should be sent for all operations on the table or query.
	OpAll = Operation(C.DPI_OPCODE_ALL_OPS)
	// OpAllRows Indicates that all rows have been changed in the table or query (or too many rows were changed or row information was not requested).
	OpAllRows = Operation(C.DPI_OPCODE_ALL_ROWS)
	// OpInsert Indicates that an insert operation has taken place in the table or query.
	OpInsert = Operation(C.DPI_OPCODE_INSERT)
	// OpUpdate Indicates that an update operation has taken place in the table or query.
	OpUpdate = Operation(C.DPI_OPCODE_UPDATE)
	// OpDelete Indicates that a delete operation has taken place in the table or query.
	OpDelete = Operation(C.DPI_OPCODE_DELETE)
	// OpAlter Indicates that the registered table or query has been altered.
	OpAlter = Operation(C.DPI_OPCODE_ALTER)
	// OpDrop Indicates that the registered table or query has been dropped.
	OpDrop = Operation(C.DPI_OPCODE_DROP)
	// OpUnknown An unknown operation has taken place.
	OpUnknown = Operation(C.DPI_OPCODE_UNKNOWN)
)
View Source 
const Version = "v2.1.14"

Version of this driver

Variables

View Source 
var (
	// Int64 for converting to-from int64.
	Int64 = intType{}
	// Float64 for converting to-from float64.
	Float64 = floatType{}
	// Num for converting to-from Number (string)
	Num = numType{}
)
View Source 
var ErrNotCollection = errors.New("not collection")

ErrNotCollection is returned when the Object is not a collection.

View Source 
var ErrNotExist = errors.New("not exist")

ErrNotExist is returned when the collection's requested element does not exist.

View Source 
var Log func(...interface{}) error

Log function. By default, it's nil, and thus logs nothing. If you want to change this, change it to a github.com/go-kit/kit/log.Swapper.Log or analog to be race-free.

Functions

func CallbackSubscr 

func CallbackSubscr(ctx unsafe.Pointer, message *C.dpiSubscrMessage)

CallbackSubscr is the callback for C code on subscription event.

func ContextWithLog 

func ContextWithLog(ctx context.Context, logF func(...interface{}) error) context.Context

ContextWithLog returns a context with the given log function.

func ContextWithTraceTag 

func ContextWithTraceTag(ctx context.Context, tt TraceTag) context.Context

ContextWithTraceTag returns a context with the specified TraceTag, which will be set on the session used.

func EnableDbmsOutput 

func EnableDbmsOutput(ctx context.Context, conn Execer) error

EnableDbmsOutput enables DBMS_OUTPUT buffering on the given connection. This is required if you want to retrieve the output with ReadDbmsOutput later.

func MapToSlice 

func MapToSlice(qry string, metParam func(string) interface{}) (string, []interface{})

MapToSlice modifies query for map (:paramname) to :%d placeholders + slice of params.

Calls metParam for each parameter met, and returns the slice of their results.

func NamedToOrdered 

func NamedToOrdered(qry string, namedParams map[string]interface{}) (string, []interface{})

NamedToOrdered converts the query from named params (:paramname) to :%d placeholders + slice of params, copying the params verbatim.

func ReadDbmsOutput 

func ReadDbmsOutput(ctx context.Context, w io.Writer, conn preparer) error

ReadDbmsOutput copies the DBMS_OUTPUT buffer into the given io.Writer.

Types

type Column 

type Column struct {
	Name       string
	OracleType C.dpiOracleTypeNum
	NativeType C.dpiNativeTypeNum
	Size       C.uint32_t
	Precision  C.int16_t
	Scale      C.int8_t
	Nullable   bool
	ObjectType *C.dpiObjectType
}

Column holds the info from a column.

type CompileError 

type CompileError struct {
	Owner, Name, Type    string
	Line, Position, Code int64
	Text                 string
	Warning              bool
}

CompileError represents a compile-time error as in user_errors view.

func GetCompileErrors 

func GetCompileErrors(queryer queryer, all bool) ([]CompileError, error)

GetCompileErrors returns the slice of the errors in user_errors.

If all is false, only errors are returned; otherwise, warnings, too.

func (CompileError) Error 

func (ce CompileError) Error() string

type Conn 

type Conn interface {
	driver.Conn
	driver.Pinger
	Break() error
	BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error)
	PrepareContext(ctx context.Context, query string) (driver.Stmt, error)
	Commit() error
	Rollback() error
	ServerVersion() (VersionInfo, error)
	GetObjectType(name string) (*ObjectType, error)
	NewSubscription(string, func(Event)) (*Subscription, error)
}

func DriverConn 

func DriverConn(ex Execer) (Conn, error)

DriverConn returns the *goracle.conn of the databas/sql.Conn

type ConnectionParams 

type ConnectionParams struct {
	Username, Password, SID, ConnClass      string
	IsSysDBA, IsSysOper                     bool
	MinSessions, MaxSessions, PoolIncrement int
}

ConnectionParams holds the params for a connection (pool). You can use ConnectionParams{...}.String() as a connection string in sql.Open.

func ParseConnString 

func ParseConnString(connString string) (ConnectionParams, error)

ParseConnString parses the given connection string into a struct.

func (ConnectionParams) String 

func (P ConnectionParams) String() string

func (ConnectionParams) StringNoClass 

func (P ConnectionParams) StringNoClass() string

StringNoClass returns the string representation of ConnectionParams, without class info.

type Data 

type Data struct {
	NativeTypeNum C.dpiNativeTypeNum
	// contains filtered or unexported fields
}

Data holds the data to/from Oracle.

func (*Data) Get 

func (d *Data) Get() interface{}

Get returns the contents of Data.

func (*Data) GetBool 

func (d *Data) GetBool() bool

GetBool returns the bool data.

func (*Data) GetBytes 

func (d *Data) GetBytes() []byte

GetBytes returns the []byte from the data.

func (*Data) GetFloat32 

func (d *Data) GetFloat32() float32

GetFloat32 gets float32 from the data.

func (*Data) GetFloat64 

func (d *Data) GetFloat64() float64

GetFloat64 gets float64 from the data.

func (*Data) GetInt64 

func (d *Data) GetInt64() int64

GetInt64 gets int64 from the data.

func (*Data) GetIntervalDS 

func (d *Data) GetIntervalDS() time.Duration

GetIntervalDS gets duration as interval date-seconds from data.

func (*Data) GetIntervalYM 

func (d *Data) GetIntervalYM() IntervalYM

GetIntervalYM gets IntervalYM from the data.

func (*Data) GetLob 

func (d *Data) GetLob() *Lob

GetLob gets data as Lob.

func (*Data) GetObject 

func (d *Data) GetObject() *Object

GetObject gets Object from data.

func (*Data) GetStmt 

func (d *Data) GetStmt() driver.Stmt

GetStmt gets Stmt from data.

func (*Data) GetTime 

func (d *Data) GetTime() time.Time

GetTime gets Time from data.

func (*Data) GetUint64 

func (d *Data) GetUint64() uint64

GetUint64 gets data as uint64.

func (*Data) IsNull 

func (d *Data) IsNull() bool

IsNull returns whether the data is null.

func (*Data) SetBool 

func (d *Data) SetBool(b bool)

SetBool sets the data as bool.

func (*Data) SetBytes 

func (d *Data) SetBytes(b []byte)

SetBytes set the data as []byte.

func (*Data) SetFloat32 

func (d *Data) SetFloat32(f float32)

SetFloat32 sets the data as float32.

func (*Data) SetFloat64 

func (d *Data) SetFloat64(f float64)

SetFloat64 sets the data as float64.

func (*Data) SetInt64 

func (d *Data) SetInt64(i int64)

SetInt64 sets the data as int64.

func (*Data) SetIntervalDS 

func (d *Data) SetIntervalDS(dur time.Duration)

SetIntervalDS sets the duration as interval date-seconds to data.

func (*Data) SetIntervalYM 

func (d *Data) SetIntervalYM(ym IntervalYM)

SetIntervalYM sets IntervalYM to the data.

func (*Data) SetObject 

func (d *Data) SetObject(o *Object)

SetObject sets Object to data.

func (*Data) SetStmt 

func (d *Data) SetStmt(s *statement)

SetStmt sets Stmt to data.

func (*Data) SetTime 

func (d *Data) SetTime(t time.Time)

SetTime sets Time to data.

func (*Data) SetUint64 

func (d *Data) SetUint64(u uint64)

SetUint64 sets data to uint64.

type DataTypeInfo 

type DataTypeInfo struct {
	OracleTypeNum                       C.dpiOracleTypeNum
	NativeTypeNum                       C.dpiNativeTypeNum
	ObjectType                          *ObjectType
	DBSize, ClientSizeInBytes, CharSize int
	Precision                           int16
	Scale                               int8
	FsPrecision                         uint8
}

DataTypeInfo holds type info for a Data.

type DirectLob 

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

DirectLob holds a Lob and allows direct (Read/WriteAt, not streaming Read/Write) operations on it.

func (*DirectLob) Close 

func (dl *DirectLob) Close() error

Close the Lob.

func (*DirectLob) ReadAt 

func (dl *DirectLob) ReadAt(p []byte, offset int64) (int, error)

ReadAt reads at most len(p) bytes into p at offset.

func (*DirectLob) WriteAt 

func (dl *DirectLob) WriteAt(p []byte, offset int64) (int, error)

WriteAt writes p starting at offset.

type Event 

type Event struct {
	Err     error
	Type    EventType
	DB      string
	Tables  []TableEvent
	Queries []QueryEvent
}

Event for a subscription.

type EventType 

type EventType C.dpiEventType

EventType is the type of an event.

type Execer 

type Execer interface {
	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
}

Execer is the ExecContext of sql.Conn.

type IntervalYM 

type IntervalYM struct {
	Years, Months int
}

IntervalYM holds Years and Months as interval.

type Lob 

type Lob struct {
	io.Reader
	IsClob bool
}

Lob is for reading/writing a LOB.

func (*Lob) Hijack 

func (lob *Lob) Hijack() (*DirectLob, error)

Hijack the underlying lob reader/writer, and return a DirectLob for reading/writing the lob directly.

After this, the Lob is unusable!

type Number 

type Number string

Number as string

func (Number) MarshalJSON 

func (n Number) MarshalJSON() ([]byte, error)

func (Number) MarshalText 

func (n Number) MarshalText() ([]byte, error)

func (*Number) Scan 

func (n *Number) Scan(v interface{}) error

Scan into the Number from a driver.Value.

func (Number) String 

func (n Number) String() string

func (*Number) UnmarshalJSON 

func (n *Number) UnmarshalJSON(p []byte) error

func (*Number) UnmarshalText 

func (n *Number) UnmarshalText(p []byte) error

func (Number) Value 

func (n Number) Value() (driver.Value, error)

Value returns the Number as driver.Value

type Object 

type Object struct {
	*ObjectType
	// contains filtered or unexported fields
}

Object represents a dpiObject.

func (Object) ClientVersion 

func (d Object) ClientVersion() (VersionInfo, error)

func (*Object) GetAttribute 

func (O *Object) GetAttribute(data *Data, i int) error

GetAttribute gets the i-th attribute into data.

func (Object) Open 

func (d Object) Open(connString string) (driver.Conn, error)

Open returns a new connection to the database. The name is a string in a driver-specific format.

func (*Object) SetAttribute 

func (O *Object) SetAttribute(i int, data *Data) error

SetAttribute sets the i-th attribute with data.

type ObjectAttribute 

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

ObjectAttribute is an attribute of an Object.

func (ObjectAttribute) ClientVersion 

func (d ObjectAttribute) ClientVersion() (VersionInfo, error)

func (ObjectAttribute) Close 

func (A ObjectAttribute) Close() error

Close the ObjectAttribute.

func (ObjectAttribute) Open 

func (d ObjectAttribute) Open(connString string) (driver.Conn, error)

Open returns a new connection to the database. The name is a string in a driver-specific format.

type ObjectCollection 

type ObjectCollection struct {
	Object
}

ObjectCollection represents a Collection of Objects - itself an Object, too.

func (*ObjectCollection) Append 

func (O *ObjectCollection) Append(data *Data) error

Append data to the collection.

func (ObjectCollection) ClientVersion 

func (d ObjectCollection) ClientVersion() (VersionInfo, error)

func (*ObjectCollection) Delete 

func (O *ObjectCollection) Delete(i int) error

Delete i-th element of the collection.

func (*ObjectCollection) First 

func (O *ObjectCollection) First() (int, error)

First returns the first element's index of the collection.

func (*ObjectCollection) Get 

func (O *ObjectCollection) Get(data *Data, i int) error

Get the i-th element of the collection into data.

func (*ObjectCollection) Last 

func (O *ObjectCollection) Last() (int, error)

Last returns the index of the last element.

func (*ObjectCollection) Len 

func (O *ObjectCollection) Len() (int, error)

Len returns the length of the collection.

func (*ObjectCollection) Next 

func (O *ObjectCollection) Next(i int) (int, error)

Next returns the succeeding index of i.

func (ObjectCollection) Open 

func (d ObjectCollection) Open(connString string) (driver.Conn, error)

Open returns a new connection to the database. The name is a string in a driver-specific format.

func (*ObjectCollection) Set 

func (O *ObjectCollection) Set(i int, data *Data) error

Set the i-th element of the collection with data.

func (*ObjectCollection) Trim 

func (O *ObjectCollection) Trim(n int) error

Trim the collection to n.

type ObjectCollectionInfo 

type ObjectCollectionInfo interface {
	OracleTypeNum() C.dpiOracleTypeNum
	NativeTypeNum() C.dpiNativeTypeNum
	ObjectType() *ObjectType
}

ObjectCollectionInfo holds type info of the collection.

type ObjectInfo 

type ObjectInfo interface {
	Schema() string
	Name() string
	NumAttributes() int
	IsCollection() bool
}

ObjectInfo holds Object type info.

type ObjectType 

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

ObjectType holds type info of an Object.

func GetObjectType 

func GetObjectType(ex Execer, typeName string) (*ObjectType, error)

GetObjectType returns the ObjectType for the name.

func (*ObjectType) Attributes 

func (t *ObjectType) Attributes() ([]ObjectAttribute, error)

Attributes of the ObjectType.

func (ObjectType) ClientVersion 

func (d ObjectType) ClientVersion() (VersionInfo, error)

func (*ObjectType) Info 

func (t *ObjectType) Info() (ObjectInfo, error)

Info returns ObjectInfo of the ObjectType.

func (*ObjectType) NewObject 

func (t *ObjectType) NewObject() (*Object, error)

NewObject returns a new Object with ObjectType type.

func (ObjectType) Open 

func (d ObjectType) Open(connString string) (driver.Conn, error)

Open returns a new connection to the database. The name is a string in a driver-specific format.

type Operation 

type Operation C.dpiOpCode

Operation in the DB.

type Option 

type Option func(*stmtOptions)

Option holds statement options. 

var PlSQLArrays Option = func(o *stmtOptions) { o.plSQLArrays = true }

PlSQLArrays is to signal that the slices given in arguments of Exec to be left as is - the default is to treat them as arguments for ExecMany.

func ArraySize 

func ArraySize(arraySize int) Option

ArraySize returns an option to set the array size to be used, overriding DefaultArraySize.

func FetchRowCount 

func FetchRowCount(rowCount int) Option

FetchRowCount returns an option to set the rows to be fetched, overriding DefaultFetchRowCount.

func ParseOnly 

func ParseOnly() Option

ParseOnly returns an option to set the ExecMode to only Parse.

type OraErr 

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

func (*OraErr) Code 

func (oe *OraErr) Code() int

func (*OraErr) Error 

func (oe *OraErr) Error() string

func (*OraErr) Message 

func (oe *OraErr) Message() string

type QueryColumn 

type QueryColumn struct {
	Name                           string
	Type, Length, Precision, Scale int
	Nullable                       bool
}

QueryColumn is the described column.

func DescribeQuery 

func DescribeQuery(ctx context.Context, db Execer, qry string) ([]QueryColumn, error)

DescribeQuery describes the columns in the qry.

This can help using unknown-at-compile-time, a.k.a. dynamic queries.

type QueryEvent 

type QueryEvent struct {
	Operation
	ID     uint64
	Tables []TableEvent
}

QueryEvent is an event of a Query.

type RowEvent 

type RowEvent struct {
	Operation
	Rowid string
}

RowEvent is for row-related event.

type Subscription 

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

Subscription for events in the DB.

func (Subscription) Begin deprecated 

func (c Subscription) Begin() (driver.Tx, error)

Begin starts and returns a new transaction.

Deprecated: Drivers should implement ConnBeginTx instead (or additionally).

func (Subscription) BeginTx 

func (c Subscription) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error)

BeginTx starts and returns a new transaction. If the context is canceled by the user the sql package will call Tx.Rollback before discarding and closing the connection.

This must check opts.Isolation to determine if there is a set isolation level. If the driver does not support a non-default level and one is set or if there is a non-default isolation level that is not supported, an error must be returned.

This must also check opts.ReadOnly to determine if the read-only value is true to either set the read-only transaction property if supported or return an error if it is not supported.

func (Subscription) Break 

func (c Subscription) Break() error

func (*Subscription) Close 

func (s *Subscription) Close() error

Close the subscription.

func (Subscription) Commit 

func (c Subscription) Commit() error

func (Subscription) GetObjectType 

func (c Subscription) GetObjectType(name string) (*ObjectType, error)

GetObjectType returns the ObjectType of a name.

func (Subscription) NewSubscription 

func (c Subscription) NewSubscription(name string, cb func(Event)) (*Subscription, error)

NewSubscription creates a new Subscription in the DB.

func (Subscription) Ping 

func (c Subscription) Ping(ctx context.Context) error

func (Subscription) Prepare 

func (c Subscription) Prepare(query string) (driver.Stmt, error)

Prepare returns a prepared statement, bound to this connection.

func (Subscription) PrepareContext 

func (c Subscription) PrepareContext(ctx context.Context, query string) (driver.Stmt, error)

PrepareContext returns a prepared statement, bound to this connection. context is for the preparation of the statement, it must not store the context within the statement itself.

func (*Subscription) Register 

func (s *Subscription) Register(qry string, params ...interface{}) error

Register a query for Change Notification.

func (Subscription) Rollback 

func (c Subscription) Rollback() error

func (Subscription) ServerVersion 

func (c Subscription) ServerVersion() (VersionInfo, error)

type TableEvent 

type TableEvent struct {
	Operation
	Name string
	Rows []RowEvent
}

TableEvent is for a Table-related event.

type TraceTag 

type TraceTag struct {
	// ClientIdentifier - specifies an end user based on the logon ID, such as HR.HR
	ClientIdentifier string
	// ClientInfo - client-specific info
	ClientInfo string
	// DbOp - database operation
	DbOp string
	// Module - specifies a functional block, such as Accounts Receivable or General Ledger, of an application
	Module string
	// Action - specifies an action, such as an INSERT or UPDATE operation, in a module
	Action string
}

type VersionInfo 

type VersionInfo struct {
	Version, Release, Update, PortRelease, PortUpdate, Full int
	ServerRelease                                           string
}

VersionInfo holds version info returned by Oracle DB.

func ClientVersion 

func ClientVersion(ex Execer) (VersionInfo, error)

ClientVersion returns the VersionInfo from the DB.

func ServerVersion 

func ServerVersion(ex Execer) (VersionInfo, error)

ServerVersion returns the VersionInfo of the client.

func (VersionInfo) String 

func (V VersionInfo) String() string

Source Files

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