func (c *ClientConn) executeInNode(conn *backend.BackendConn, sql string, args []interface{}) ([]*mysql.Result, error) {
var state string
r, err := conn.Execute(sql, args...)
if err != nil {
state = "ERROR"
} else {
state = "INFO"
}
if strings.ToLower(c.proxy.cfg.LogSql) != golog.LogSqlOff {
golog.OutputSql(state, "%s->%s:%s",
c.c.RemoteAddr(),
conn.GetAddr(),
sql,
)
}
if err != nil {
return nil, err
}
return []*mysql.Result{r}, err
}
func (c *ClientConn) executeInMultiNodes(conns map[string]*backend.BackendConn, sqls map[string][]string, args []interface{}) ([]*mysql.Result, error) {
if len(conns) != len(sqls) {
golog.Error("ClientConn", "executeInMultiNodes", errors.ErrConnNotEqual.Error(), c.connectionId,
"conns", conns,
"sqls", sqls,
)
return nil, errors.ErrConnNotEqual
}
var wg sync.WaitGroup
if len(conns) == 0 {
return nil, errors.ErrNoPlan
}
wg.Add(len(conns))
resultCount := 0
for _, sqlSlice := range sqls {
resultCount += len(sqlSlice)
}
rs := make([]interface{}, resultCount)
f := func(rs []interface{}, i int, execSqls []string, co *backend.BackendConn) {
var state string
for _, v := range execSqls {
r, err := co.Execute(v, args...)
if err != nil {
state = "ERROR"
rs[i] = err
} else {
state = "INFO"
rs[i] = r
}
if c.proxy.cfg.LogSql != golog.LogSqlOff {
golog.OutputSql(state, "%s->%s:%s",
c.c.RemoteAddr(),
co.GetAddr(),
v,
)
}
i++
}
wg.Done()
}
offsert := 0
for nodeName, co := range conns {
s := sqls[nodeName] //[]string
go f(rs, offsert, s, co)
offsert += len(s)
}
wg.Wait()
var err error
r := make([]*mysql.Result, resultCount)
for i, v := range rs {
if e, ok := v.(error); ok {
err = e
break
}
r[i] = rs[i].(*mysql.Result)
}
return r, err
}
/*处理query语句*/
func (c *ClientConn) handleQuery(sql string) (err error) {
defer func() {
if e := recover(); e != nil {
golog.OutputSql("Error", "err:%v,sql:%s", e, sql)
if err, ok := e.(error); ok {
const size = 4096
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
golog.Error("ClientConn", "handleQuery",
err.Error(), 0,
"stack", string(buf), "sql", sql)
}
return
}
}()
sql = strings.TrimRight(sql, ";") //删除sql语句最后的分号
hasHandled, err := c.preHandleShard(sql)
if err != nil {
golog.Error("server", "preHandleShard", err.Error(), 0, "hasHandled", hasHandled)
return err
}
if hasHandled {
return nil
}
var stmt sqlparser.Statement
stmt, err = sqlparser.Parse(sql) //解析sql语句,得到的stmt是一个interface
if err != nil {
golog.Error("server", "parse", err.Error(), 0, "hasHandled", hasHandled, "sql", sql)
return err
}
switch v := stmt.(type) {
case *sqlparser.Select:
return c.handleSelect(v, nil)
case *sqlparser.Insert:
return c.handleExec(stmt, nil)
case *sqlparser.Update:
return c.handleExec(stmt, nil)
case *sqlparser.Delete:
return c.handleExec(stmt, nil)
case *sqlparser.Replace:
return c.handleExec(stmt, nil)
case *sqlparser.Set:
return c.handleSet(v, sql)
case *sqlparser.Begin:
return c.handleBegin()
case *sqlparser.Commit:
return c.handleCommit()
case *sqlparser.Rollback:
return c.handleRollback()
case *sqlparser.Admin:
return c.handleAdmin(v)
case *sqlparser.UseDB:
return c.handleUseDB(v)
default:
return fmt.Errorf("statement %T not support now", stmt)
}
return nil
}