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dml.go
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dml.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package planbuilder
import (
"strconv"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/vt/schema"
"github.com/youtube/vitess/go/vt/sqlparser"
)
func analyzeUpdate(upd *sqlparser.Update, getTable TableGetter) (plan *ExecPlan, err error) {
// Default plan
plan = &ExecPlan{
PlanId: PLAN_PASS_DML,
FullQuery: GenerateFullQuery(upd),
}
tableName := sqlparser.GetTableName(upd.Table)
if tableName == "" {
plan.Reason = REASON_TABLE
return plan, nil
}
tableInfo, err := plan.setTableInfo(tableName, getTable)
if err != nil {
return nil, err
}
if len(tableInfo.Indexes) == 0 || tableInfo.Indexes[0].Name != "PRIMARY" {
log.Warningf("no primary key for table %s", tableName)
plan.Reason = REASON_TABLE_NOINDEX
return plan, nil
}
plan.SecondaryPKValues, err = analyzeUpdateExpressions(upd.Exprs, tableInfo.Indexes[0])
if err != nil {
if err == TooComplex {
plan.Reason = REASON_PK_CHANGE
return plan, nil
}
return nil, err
}
plan.PlanId = PLAN_DML_SUBQUERY
plan.OuterQuery = GenerateUpdateOuterQuery(upd, tableInfo.Indexes[0])
plan.Subquery = GenerateUpdateSubquery(upd, tableInfo)
conditions := analyzeWhere(upd.Where)
if conditions == nil {
plan.Reason = REASON_WHERE
return plan, nil
}
pkValues, err := getPKValues(conditions, tableInfo.Indexes[0])
if err != nil {
return nil, err
}
if pkValues != nil {
plan.PlanId = PLAN_DML_PK
plan.OuterQuery = plan.FullQuery
plan.PKValues = pkValues
return plan, nil
}
return plan, nil
}
func analyzeDelete(del *sqlparser.Delete, getTable TableGetter) (plan *ExecPlan, err error) {
// Default plan
plan = &ExecPlan{
PlanId: PLAN_PASS_DML,
FullQuery: GenerateFullQuery(del),
}
tableName := sqlparser.GetTableName(del.Table)
if tableName == "" {
plan.Reason = REASON_TABLE
return plan, nil
}
tableInfo, err := plan.setTableInfo(tableName, getTable)
if err != nil {
return nil, err
}
if len(tableInfo.Indexes) == 0 || tableInfo.Indexes[0].Name != "PRIMARY" {
log.Warningf("no primary key for table %s", tableName)
plan.Reason = REASON_TABLE_NOINDEX
return plan, nil
}
plan.PlanId = PLAN_DML_SUBQUERY
plan.OuterQuery = GenerateDeleteOuterQuery(del, tableInfo.Indexes[0])
plan.Subquery = GenerateDeleteSubquery(del, tableInfo)
conditions := analyzeWhere(del.Where)
if conditions == nil {
plan.Reason = REASON_WHERE
return plan, nil
}
pkValues, err := getPKValues(conditions, tableInfo.Indexes[0])
if err != nil {
return nil, err
}
if pkValues != nil {
plan.PlanId = PLAN_DML_PK
plan.OuterQuery = plan.FullQuery
plan.PKValues = pkValues
return plan, nil
}
return plan, nil
}
func analyzeSet(set *sqlparser.Set) (plan *ExecPlan) {
plan = &ExecPlan{
PlanId: PLAN_SET,
FullQuery: GenerateFullQuery(set),
}
if len(set.Exprs) > 1 { // Multiple set values
return plan
}
update_expression := set.Exprs[0]
plan.SetKey = string(update_expression.Name.Name)
numExpr, ok := update_expression.Expr.(sqlparser.NumVal)
if !ok {
return plan
}
val := string(numExpr)
if ival, err := strconv.ParseInt(val, 0, 64); err == nil {
plan.SetValue = ival
} else if fval, err := strconv.ParseFloat(val, 64); err == nil {
plan.SetValue = fval
}
return plan
}
func analyzeUpdateExpressions(exprs sqlparser.UpdateExprs, pkIndex *schema.Index) (pkValues []interface{}, err error) {
for _, expr := range exprs {
index := pkIndex.FindColumn(sqlparser.GetColName(expr.Name))
if index == -1 {
continue
}
if !sqlparser.IsValue(expr.Expr) {
log.Warningf("expression is too complex %v", expr)
return nil, TooComplex
}
if pkValues == nil {
pkValues = make([]interface{}, len(pkIndex.Columns))
}
var err error
pkValues[index], err = sqlparser.AsInterface(expr.Expr)
if err != nil {
return nil, err
}
}
return pkValues, nil
}