Exemplo n.º 1
0
func (c *ClientConn) handleSetNames(ch, ci sqlparser.ValExpr) error {
	var cid mysql.CollationId
	var ok bool

	value := sqlparser.String(ch)
	value = strings.Trim(value, "'`\"")

	charset := strings.ToLower(value)
	if charset == "null" {
		return c.writeOK(nil)
	}
	if ci == nil {
		cid, ok = mysql.CharsetIds[charset]
		if !ok {
			return fmt.Errorf("invalid charset %s", charset)
		}
	} else {
		collate := sqlparser.String(ci)
		collate = strings.Trim(value, "'`\"")
		cid, ok = mysql.CollationNames[collate]
		if !ok {
			return fmt.Errorf("invalid charset %s", charset)
		}
	}
	c.charset = charset
	c.collation = cid

	return c.writeOK(nil)
}
Exemplo n.º 2
0
func (r *Router) buildReplacePlan(statement sqlparser.Statement) (*Plan, error) {
	plan := &Plan{}
	plan.Rows = make(map[int]sqlparser.Values)

	stmt := statement.(*sqlparser.Replace)
	if _, ok := stmt.Rows.(sqlparser.SelectStatement); ok {
		panic(sqlparser.NewParserError("select in replace not allowed"))
	}

	if stmt.Columns == nil {
		return nil, errors.ErrIRNoColumns
	}

	plan.Rule = r.GetRule(sqlparser.String(stmt.Table))

	err := plan.GetIRKeyIndex(stmt.Columns)
	if err != nil {
		return nil, err
	}

	plan.Criteria = plan.checkValuesType(stmt.Rows.(sqlparser.Values))

	err = plan.calRouteIndexs()
	if err != nil {
		golog.Error("Route", "BuildReplacePlan", err.Error(), 0)
		return nil, err
	}

	err = r.generateReplaceSql(plan, stmt)
	if err != nil {
		return nil, err
	}
	return plan, nil
}
Exemplo n.º 3
0
func (r *Router) buildDeletePlan(statement sqlparser.Statement) (*Plan, error) {
	plan := &Plan{}
	var where *sqlparser.Where
	var err error

	stmt := statement.(*sqlparser.Delete)
	plan.Rule = r.GetRule(sqlparser.String(stmt.Table))
	where = stmt.Where

	if where != nil {
		plan.Criteria = where.Expr //路由条件
		err = plan.calRouteIndexs()
		if err != nil {
			golog.Error("Route", "BuildUpdatePlan", err.Error(), 0)
			return nil, err
		}
	} else {
		//if shard delete without where,send to all nodes and all tables
		plan.RouteTableIndexs = plan.Rule.SubTableIndexs
		plan.RouteNodeIndexs = makeList(0, len(plan.Rule.Nodes))
	}

	if plan.Rule.Type != DefaultRuleType && len(plan.RouteTableIndexs) == 0 {
		golog.Error("Route", "BuildDeletePlan", errors.ErrNoCriteria.Error(), 0)
		return nil, errors.ErrNoCriteria
	}
	//generate sql,如果routeTableindexs为空则表示不分表,不分表则发default node
	err = r.generateDeleteSql(plan, stmt)
	if err != nil {
		return nil, err
	}
	return plan, nil
}
Exemplo n.º 4
0
func (r *Router) buildSelectPlan(statement sqlparser.Statement) (*Plan, error) {
	plan := &Plan{}
	var where *sqlparser.Where
	var err error
	var tableName string

	stmt := statement.(*sqlparser.Select)
	switch v := (stmt.From[0]).(type) {
	case *sqlparser.AliasedTableExpr:
		tableName = sqlparser.String(v.Expr)
	case *sqlparser.JoinTableExpr:
		if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
			tableName = sqlparser.String(ate.Expr)
		} else {
			tableName = sqlparser.String(v)
		}
	default:
		tableName = sqlparser.String(v)
	}

	plan.Rule = r.GetRule(tableName) //根据表名获得分表规则
	where = stmt.Where

	if where != nil {
		plan.Criteria = where.Expr //路由条件
		err = plan.calRouteIndexs()
		if err != nil {
			golog.Error("Route", "BuildSelectPlan", err.Error(), 0)
			return nil, err
		}
	} else {
		//if shard select without where,send to all nodes and all tables
		plan.RouteTableIndexs = plan.Rule.SubTableIndexs
		plan.RouteNodeIndexs = makeList(0, len(plan.Rule.Nodes))
	}

	if plan.Rule.Type != DefaultRuleType && len(plan.RouteTableIndexs) == 0 {
		golog.Error("Route", "BuildSelectPlan", errors.ErrNoCriteria.Error(), 0)
		return nil, errors.ErrNoCriteria
	}
	//generate sql,如果routeTableindexs为空则表示不分表,不分表则发default node
	err = r.generateSelectSql(plan, stmt)
	if err != nil {
		return nil, err
	}
	return plan, nil
}
Exemplo n.º 5
0
func (r *Router) buildInsertPlan(statement sqlparser.Statement) (*Plan, error) {
	plan := &Plan{}
	plan.Rows = make(map[int]sqlparser.Values)
	stmt := statement.(*sqlparser.Insert)
	if _, ok := stmt.Rows.(sqlparser.SelectStatement); ok {
		return nil, errors.ErrSelectInInsert
	}

	if stmt.Columns == nil {
		return nil, errors.ErrIRNoColumns
	}

	//根据sql语句的表,获得对应的分片规则
	plan.Rule = r.GetRule(sqlparser.String(stmt.Table))

	err := plan.GetIRKeyIndex(stmt.Columns)
	if err != nil {
		return nil, err
	}

	if stmt.OnDup != nil {
		err := plan.Rule.checkUpdateExprs(sqlparser.UpdateExprs(stmt.OnDup))
		if err != nil {
			return nil, err
		}
	}

	plan.Criteria = plan.checkValuesType(stmt.Rows.(sqlparser.Values))

	err = plan.calRouteIndexs()
	if err != nil {
		golog.Error("Route", "BuildInsertPlan", err.Error(), 0)
		return nil, err
	}

	err = r.generateInsertSql(plan, stmt)
	if err != nil {
		return nil, err
	}
	return plan, nil
}
Exemplo n.º 6
0
func (c *ClientConn) handleUseDB(stmt *sqlparser.UseDB) error {
	if len(stmt.DB) == 0 {
		return fmt.Errorf("must have database, not %s", sqlparser.String(stmt))
	}
	if c.schema == nil {
		return mysql.NewDefaultError(mysql.ER_NO_DB_ERROR)
	}

	nodeName := c.schema.rule.DefaultRule.Nodes[0]

	n := c.proxy.GetNode(nodeName)
	co, err := n.GetMasterConn()
	defer c.closeConn(co, false)
	if err != nil {
		return err
	}

	if err = co.UseDB(string(stmt.DB)); err != nil {
		return err
	}
	c.db = string(stmt.DB)
	return c.writeOK(nil)
}
Exemplo n.º 7
0
//rewrite select sql
func (r *Router) rewriteSelectSql(plan *Plan, node *sqlparser.Select, tableIndex int) string {
	buf := sqlparser.NewTrackedBuffer(nil)
	buf.Fprintf("select %v%s%v",
		node.Comments,
		node.Distinct,
		node.SelectExprs,
	)
	//insert the group columns in the first of select cloumns
	if len(node.GroupBy) != 0 {
		prefix := ","
		for _, n := range node.GroupBy {
			buf.Fprintf("%s%v", prefix, n)
		}
	}
	buf.Fprintf(" from ")
	switch v := (node.From[0]).(type) {
	case *sqlparser.AliasedTableExpr:
		if len(v.As) != 0 {
			fmt.Fprintf(buf, "%s_%04d as %s",
				sqlparser.String(v.Expr),
				tableIndex,
				string(v.As),
			)
		} else {
			fmt.Fprintf(buf, "%s_%04d",
				sqlparser.String(v.Expr),
				tableIndex,
			)
		}
	case *sqlparser.JoinTableExpr:
		if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
			if len(ate.As) != 0 {
				fmt.Fprintf(buf, "%s_%04d as %s",
					sqlparser.String(ate.Expr),
					tableIndex,
					string(ate.As),
				)
			} else {
				fmt.Fprintf(buf, "%s_%04d",
					sqlparser.String(ate.Expr),
					tableIndex,
				)
			}
		} else {
			fmt.Fprintf(buf, "%s_%04d",
				sqlparser.String(v.LeftExpr),
				tableIndex,
			)
		}
		buf.Fprintf(" %s %v", v.Join, v.RightExpr)
		if v.On != nil {
			buf.Fprintf(" on %v", v.On)
		}
	default:
		fmt.Fprintf(buf, "%s_%04d",
			sqlparser.String(node.From[0]),
			tableIndex,
		)
	}
	//append other tables
	prefix := ", "
	for i := 1; i < len(node.From); i++ {
		buf.Fprintf("%s%v", prefix, node.From[i])
	}
	buf.Fprintf("%v%v%v%v%s",
		node.Where,
		node.GroupBy,
		node.Having,
		node.OrderBy,
		node.Lock,
	)
	return buf.String()
}