Golang Node.GetSlaveConn Examples

Example #1

File: conn_query.go Project: flike/kingshard

func (c *ClientConn) getBackendConn(n *backend.Node, fromSlave bool) (co *backend.BackendConn, err error) {
	if !c.isInTransaction() {
		if fromSlave {
			co, err = n.GetSlaveConn()
			if err != nil {
				co, err = n.GetMasterConn()
			}
		} else {
			co, err = n.GetMasterConn()
		}
		if err != nil {
			golog.Error("server", "getBackendConn", err.Error(), 0)
			return
		}
	} else {
		var ok bool
		co, ok = c.txConns[n]

		if !ok {
			if co, err = n.GetMasterConn(); err != nil {
				return
			}

			if !c.isAutoCommit() {
				if err = co.SetAutoCommit(0); err != nil {
					return
				}
			} else {
				if err = co.Begin(); err != nil {
					return
				}
			}

			c.txConns[n] = co
		}
	}

	if err = co.UseDB(c.db); err != nil {
		//reset the database to null
		c.db = ""
		return
	}

	if err = co.SetCharset(c.charset, c.collation); err != nil {
		return
	}

	return
}

Example #2

File: conn_query.go Project: velsai/kingshard

func (c *ClientConn) getBackendConn(n *backend.Node, fromSlave bool) (co *backend.BackendConn, err error) {
	if !c.needBeginTx() {
		if fromSlave {
			co, err = n.GetSlaveConn()
			if err != nil {
				co, err = n.GetMasterConn()
			}
		} else {
			co, err = n.GetMasterConn()
		}
		if err != nil {
			golog.Error("server", "getBackendConn", err.Error(), 0)
			return
		}
	} else {
		var ok bool
		c.Lock()
		co, ok = c.txConns[n]
		c.Unlock()

		if !ok {
			if co, err = n.GetMasterConn(); err != nil {
				return
			}

			if err = co.Begin(); err != nil {
				return
			}

			c.Lock()
			c.txConns[n] = co
			c.Unlock()
		}
	}

	//todo, set conn charset, etc...
	if err = co.UseDB(c.db); err != nil {
		return
	}

	if err = co.SetCharset(c.charset); err != nil {
		return
	}

	return
}