func (c *Conn) handleQuery(sql string) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("execute %s error %v", sql, e)
return
}
}()
sql = strings.TrimRight(sql, ";")
var stmt sqlparser.Statement
stmt, err = sqlparser.Parse(sql)
if err != nil {
return fmt.Errorf(`parse sql "%s" error`, sql)
}
switch v := stmt.(type) {
case *sqlparser.Select:
return c.handleSelect(v, sql, nil)
case *sqlparser.Insert:
return c.handleExec(stmt, sql, nil)
case *sqlparser.Update:
return c.handleExec(stmt, sql, nil)
case *sqlparser.Delete:
return c.handleExec(stmt, sql, nil)
case *sqlparser.Replace:
return c.handleExec(stmt, sql, nil)
case *sqlparser.Set:
return c.handleSet(v)
case *sqlparser.Begin:
return c.handleBegin()
case *sqlparser.Commit:
return c.handleCommit()
case *sqlparser.Rollback:
return c.handleRollback()
case *sqlparser.SimpleSelect:
return c.handleSimpleSelect(sql, v)
case *sqlparser.Show:
return c.handleShow(sql, v)
case *sqlparser.Admin:
return c.handleAdmin(v)
default:
return fmt.Errorf("statement %T not support now", stmt)
}
return nil
}
func (c *Conn) handleStmtPrepare(sql string) error {
if c.schema == nil {
return NewDefaultError(ER_NO_DB_ERROR)
}
s := new(Stmt)
sql = strings.TrimRight(sql, ";")
var err error
s.s, err = sqlparser.Parse(sql)
if err != nil {
return fmt.Errorf(`parse sql "%s" error`, sql)
}
s.sql = sql
var tableName string
switch s := s.s.(type) {
case *sqlparser.Select:
tableName = nstring(s.From)
case *sqlparser.Insert:
tableName = nstring(s.Table)
case *sqlparser.Update:
tableName = nstring(s.Table)
case *sqlparser.Delete:
tableName = nstring(s.Table)
case *sqlparser.Replace:
tableName = nstring(s.Table)
default:
return fmt.Errorf(`unsupport prepare sql "%s"`, sql)
}
r := c.schema.rule.GetRule(tableName)
n := c.server.getNode(r.Nodes[0])
if co, err := n.getMasterConn(); err != nil {
return fmt.Errorf("prepare error %s", err)
} else {
defer co.Close()
if err = co.UseDB(c.schema.db); err != nil {
return fmt.Errorf("parepre error %s", err)
}
if t, err := co.Prepare(sql); err != nil {
return fmt.Errorf("parepre error %s", err)
} else {
s.params = t.ParamNum()
s.columns = t.ColumnNum()
}
}
s.id = c.stmtId
c.stmtId++
if err = c.writePrepare(s); err != nil {
return err
}
s.ResetParams()
c.stmts[s.id] = s
return nil
}