/
db_config.go
253 lines (229 loc) · 5.91 KB
/
db_config.go
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package config
import (
"bytes"
"context"
"database/sql"
"fmt"
_ "github.com/godror/godror"
// _ "github.com/sijms/go-ora/v2"
)
type OracleConfig struct {
User string
Password string
Host string
Port int
ServiceName string
Scn int64
}
type OracleDB struct {
ctx context.Context
_db *sql.DB
LogMinerConn *sql.Conn
MetaDataConn *sql.Conn
SCN int64
}
func (m *OracleConfig) ConnectString() string {
return fmt.Sprintf("%s:%d/%s", m.Host, m.Port, m.ServiceName)
}
func OpenDb(meta *OracleConfig) (*sql.DB, error) {
if meta.ServiceName == "" {
meta.ServiceName = "xe"
}
sqlDb, err := sql.Open("godror", fmt.Sprintf(`user="%s" password="%s" connectString="%s:%d/%s"`, meta.User, meta.Password, meta.Host, meta.Port, meta.ServiceName))
// sqlDb, err := sql.Open("godror", fmt.Sprintf("oracle://%s:%s@%s:%d/%s", meta.User, meta.Password, meta.Host, meta.Port, meta.ServiceName))
if err != nil {
return nil, fmt.Errorf("error on open oracle database :%v", err)
}
return sqlDb, nil
}
func NewDB(ctx context.Context, meta *OracleConfig) (*OracleDB, error) {
sqlDB, err := OpenDb(meta)
if err != nil {
return nil, err
}
err = sqlDB.Ping()
if err != nil {
return nil, err
}
oracleDB := &OracleDB{
ctx: ctx,
_db: sqlDB,
}
oracleDB.LogMinerConn, err = sqlDB.Conn(ctx)
if err != nil {
return nil, fmt.Errorf("error on get connection:%v", err)
}
oracleDB.MetaDataConn, err = sqlDB.Conn(ctx)
if err != nil {
return nil, fmt.Errorf("error on get connection:%v", err)
}
return oracleDB, nil
}
func (o *OracleDB) Close() error {
if o.MetaDataConn != nil {
o.MetaDataConn.Close()
}
if o.LogMinerConn != nil {
o.LogMinerConn.Close()
}
return o._db.Close()
}
func (o *OracleDB) CurrentRedoLogSequenceFp() (string, error) {
query := `SELECT GROUP#, THREAD#, SEQUENCE# FROM V$LOG WHERE STATUS = 'CURRENT'`
rows, err := o.LogMinerConn.QueryContext(o.ctx, query)
if err != nil {
return "", err
}
defer rows.Close()
buf := bytes.Buffer{}
for rows.Next() {
var group string
var thread string
var sequence string
err = rows.Scan(&group, &thread, &sequence)
if err != nil {
return "", err
}
buf.WriteString(fmt.Sprintf("group:%s,thread:%s,sequence:%s",
group, thread, sequence))
buf.WriteString(";")
}
return buf.String(), nil
}
// reset date/timestamp format
func (o *OracleDB) NLS_DATE_FORMAT() error {
SQL_ALTER_DATE_FORMAT := `ALTER SESSION SET NLS_DATE_FORMAT = 'SYYYY-MM-DD HH24:MI:SS'`
_, err := o.LogMinerConn.ExecContext(o.ctx, SQL_ALTER_DATE_FORMAT)
if err != nil {
return err
}
NLS_TIMESTAMP_FORMAT := "ALTER SESSION SET NLS_TIMESTAMP_FORMAT = 'SYYYY-MM-DD HH24:MI:SS.FF6'"
_, err = o.LogMinerConn.ExecContext(o.ctx, NLS_TIMESTAMP_FORMAT)
if err != nil {
return err
}
return nil
}
func (o *OracleDB) GetTables(schema string) ([]string, error) {
asOfSCN := ""
// if o.SCN != 0 {
// asOfSCN = fmt.Sprintf("AS OF SCN %d", o.SCN)
// }
query := fmt.Sprintf(`
SELECT
table_name
FROM
all_tables
%s
WHERE
owner = '%s'`, asOfSCN, schema)
rows, err := o.MetaDataConn.QueryContext(o.ctx, query)
if err != nil {
return nil, err
}
defer rows.Close()
var tables []string
for rows.Next() {
var table string
err = rows.Scan(&table)
if err != nil {
return nil, err
}
tables = append(tables, table)
}
return tables, nil
}
func (o *OracleDB) GetSchemas() ([]string, error) {
asOfSCN := ""
// if o.SCN != 0 {
// asOfSCN = fmt.Sprintf("AS OF SCN %d", o.SCN)
// }
query := fmt.Sprintf(`SELECT
USERNAME
FROM
DBA_USERS
%s
WHERE
USERNAME NOT IN ( 'SYS', 'SYSTEM', 'ANONYMOUS', 'APEX_PUBLIC_USER', 'APEX_040000', 'OUTLN', 'XS$NULL', 'FLOWS_FILES', 'MDSYS', 'CTXSYS', 'XDB', 'HR' )`, asOfSCN)
rows, err := o.MetaDataConn.QueryContext(o.ctx, query)
if err != nil {
return nil, err
}
defer rows.Close()
var schemas []string
for rows.Next() {
var schema string
err = rows.Scan(&schema)
if err != nil {
return nil, err
}
schemas = append(schemas, schema)
}
return schemas, nil
}
func (o *OracleDB) GetColumns(schema, table string) ([]string, error) {
asOfSCN := ""
// if o.SCN != 0 {
// asOfSCN = fmt.Sprintf("AS OF SCN %d", o.SCN)
// }
query := fmt.Sprintf(`SELECT column_name
FROM all_tab_cols
%s
WHERE table_name = '%s'
AND owner = '%s'
ORDER BY COLUMN_ID`, asOfSCN, table, schema)
rows, err := o.MetaDataConn.QueryContext(o.ctx, query)
if err != nil {
return nil, err
}
defer rows.Close()
var columns []string
for rows.Next() {
var column string
err = rows.Scan(&column)
if err != nil {
return nil, err
}
columns = append(columns, column)
}
return columns, nil
}
func (o *OracleDB) GetTableDDL(schema, table string) (string, error) {
o.MetaDataConn.ExecContext(o.ctx, `begin dbms_metadata.set_transform_param(DBMS_METADATA.SESSION_TRANSFORM, 'STORAGE', false); end;`)
o.MetaDataConn.ExecContext(o.ctx, `begin dbms_metadata.set_transform_param(DBMS_METADATA.SESSION_TRANSFORM, 'SEGMENT_ATTRIBUTES', false); end;`)
o.MetaDataConn.ExecContext(o.ctx, `begin dbms_metadata.set_transform_param(DBMS_METADATA.SESSION_TRANSFORM, 'SQLTERMINATOR', true); end;`)
row := o.MetaDataConn.QueryRowContext(o.ctx, fmt.Sprintf(`
SELECT dbms_metadata.get_ddl('TABLE','%s','%s') FROM dual`, table, schema))
var query string
err := row.Scan(&query)
if err != nil {
return "", err
}
return query, nil
}
func (o *OracleDB) NewTx(ctx context.Context) (*sql.Tx, error) {
tx, err := o._db.BeginTx(ctx, &sql.TxOptions{})
if err != nil {
return nil, err
}
return tx, nil
}
func (o *OracleDB) GetCurrentSnapshotSCN() (int64, error) {
var globalSCN int64
// 获取当前 SCN 号
err := o.MetaDataConn.QueryRowContext(o.ctx, "SELECT CURRENT_SCN FROM V$DATABASE").Scan(&globalSCN)
if err != nil {
return 0, err
}
return globalSCN, nil
}
func (o *OracleDB) InitSCN(scn int64) (err error) {
if scn == 0 {
scn, err = o.GetCurrentSnapshotSCN()
if err != nil {
return err
}
}
o.SCN = scn
return nil
}