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
}
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
}