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query.go
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query.go
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package sqlStorage
import (
"fmt"
"reflect"
"strings"
"github.com/rs/rest-layer/resource"
"github.com/rs/rest-layer/schema"
"github.com/rs/rest-layer/schema/query"
"github.com/lib/pq"
)
func buildCreateQuery(tableName string, s *schema.Schema, sqlBackend string) (sqlQuery string, sqlParams []interface{}, err error) {
schemaQuery, schemaParams, err := buildSchemaQuery(s)
if err != nil {
return "", []interface{}{}, err
}
sqlQuery = fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (%s)", tableName, schemaQuery)
sqlParams = append(sqlParams, schemaParams...)
return transformQuery(sqlQuery, sqlBackend), transformParams(sqlParams, sqlBackend), nil
}
func buildSelectQuery(tableName string, q *query.Query, sqlBackend string) (sqlQuery string, sqlParams []interface{}, err error) {
predicateQuery, predicateParams, err := buildPredicateQuery(q)
if err != nil {
return "", []interface{}{}, err
}
sortQuery, sortParams, err := buildSortQuery(q)
if err != nil {
return "", []interface{}{}, err
}
paginationQuery, err := buildPaginationQuery(q)
if err != nil {
return "", []interface{}{}, err
}
sqlQuery = fmt.Sprintf("SELECT * FROM %s", tableName)
if predicateQuery != "" {
sqlQuery += fmt.Sprintf(" WHERE %s", predicateQuery)
sqlParams = append(sqlParams, predicateParams...)
}
if sortQuery != "" {
sqlQuery += fmt.Sprintf(" ORDER BY %s", sortQuery)
sqlParams = append(sqlParams, sortParams...)
}
if paginationQuery != "" {
sqlQuery += fmt.Sprintf(" %s", paginationQuery)
}
return transformQuery(sqlQuery, sqlBackend), transformParams(sqlParams, sqlBackend), nil
}
func buildInsertQuery(tableName string, i *resource.Item, sqlBackend string) (sqlQuery string, sqlParams []interface{}, err error) {
columnsStr := "etag,"
valuesStr := "?,"
sqlParams = append(sqlParams, i.ETag)
var returningColumns []string
returningStr := ""
for k, v := range i.Payload {
switch v.(type) {
case AutoIncrementingInteger:
returningColumns = append(returningColumns, k)
default:
columnsStr += k + ","
valuesStr += "?,"
sqlParams = append(sqlParams, v)
}
}
columnsStr = columnsStr[:len(columnsStr)-1]
valuesStr = valuesStr[:len(valuesStr)-1]
if len(returningColumns) > 0 {
returningStr += fmt.Sprintf(" RETURNING %s", strings.Join(returningColumns, ","))
}
sqlQuery = fmt.Sprintf("INSERT INTO %s (%s) VALUES (%s)%s", tableName, columnsStr, valuesStr, returningStr)
return transformQuery(sqlQuery, sqlBackend), transformParams(sqlParams, sqlBackend), nil
}
func buildUpdateQuery(tableName string, i *resource.Item, o *resource.Item, sqlBackend string) (sqlQuery string, sqlParams []interface{}, err error) {
setStr := "etag=?,"
sqlParams = append(sqlParams, i.ETag)
for k, v := range i.Payload {
if k != "id" {
setStr += fmt.Sprintf("%s=?,", k)
sqlParams = append(sqlParams, v)
}
}
for k, _ := range o.Payload {
if _, ok := i.Payload[k]; ok == false {
setStr += fmt.Sprintf("%s=NULL,", k)
}
}
setStr = setStr[:len(setStr)-1]
sqlParams = append(sqlParams, o.ID)
sqlParams = append(sqlParams, o.ETag)
sqlQuery = fmt.Sprintf("UPDATE %s SET %s WHERE id=? AND etag=?", tableName, setStr)
return transformQuery(sqlQuery, sqlBackend), transformParams(sqlParams, sqlBackend), nil
}
func buildDeleteQuery(tableName string, i *resource.Item, sqlBackend string) (sqlQuery string, sqlParams []interface{}, err error) {
sqlParams = append(sqlParams, i.ID)
sqlQuery = fmt.Sprintf("DELETE FROM %s WHERE id = ?", tableName)
if i.ETag != "" {
sqlParams = append(sqlParams, i.ETag)
sqlQuery += " AND etag = ?"
}
return transformQuery(sqlQuery, sqlBackend), transformParams(sqlParams, sqlBackend), nil
}
func buildClearQuery(tableName string, q *query.Query, sqlBackend string) (sqlQuery string, sqlParams []interface{}, err error) {
predicateQuery, predicateParams, err := buildPredicateQuery(q)
if err != nil {
return "", []interface{}{}, err
}
sqlQuery = fmt.Sprintf("DELETE FROM %s", tableName)
if predicateQuery != "" {
sqlQuery += fmt.Sprintf(" WHERE %s", predicateQuery)
sqlParams = append(sqlParams, predicateParams...)
}
return transformQuery(sqlQuery, sqlBackend), transformParams(sqlParams, sqlBackend), nil
}
func buildPredicateQuery(q *query.Query) (sqlQuery string, sqlParams []interface{}, err error) {
return translatePredicate(q.Predicate)
}
func buildSortQuery(q *query.Query) (sqlQuery string, sqlParams []interface{}, err error) {
if len(q.Sort) == 0 {
return "", []interface{}{}, nil
}
for _, s := range q.Sort {
sqlQuery += s.Name
if s.Reversed {
sqlQuery += " DESC"
}
sqlQuery += ","
}
return sqlQuery[:len(sqlQuery)-1], []interface{}{}, nil
}
func buildPaginationQuery(q *query.Query) (sqlQuery string, err error) {
if q.Window == nil{
return
}
limit := q.Window.Limit
if limit > 0 {
sqlQuery += fmt.Sprintf(" LIMIT %d", limit)
}
offset := q.Window.Offset
if offset > 0 {
sqlQuery += fmt.Sprintf(" OFFSET %d", offset)
}
return
}
func translatePredicate(q query.Predicate) (sqlQuery string, sqlParams []interface{}, err error) {
for i, exp := range q {
if i > 0 {
sqlQuery += " AND "
}
switch t := exp.(type) {
case *query.And:
var s string
for _, subExp := range *t {
sb, extraSqlParams, err := translatePredicate(query.Predicate{subExp})
if err != nil {
return "", []interface{}{}, err
}
sqlParams = append(sqlParams, extraSqlParams...)
s += sb + " AND "
}
sqlQuery += "(" + s[:len(s)-5] + ")"
case *query.Or:
var s string
for _, subExp := range *t {
sb, extraSqlParams, err := translatePredicate(query.Predicate{subExp})
if err != nil {
return "", []interface{}{}, err
}
sqlParams = append(sqlParams, extraSqlParams...)
s += sb + " OR "
}
sqlQuery += "(" + s[:len(s)-4] + ")"
case *query.In:
sqlParams = append(sqlParams, t.Values)
sqlQuery += t.Field + " IN (?)"
case *query.NotIn:
sqlParams = append(sqlParams, t.Values)
sqlQuery += t.Field + " NOT IN (?)"
case *query.Equal:
sqlParams = append(sqlParams, t.Value)
switch t.Value.(type) {
case string:
sqlQuery += t.Field + " LIKE ?"
case int:
sqlQuery += t.Field + " = ?"
default:
sqlQuery += t.Field + " IS ?"
}
case *query.NotEqual:
sqlParams = append(sqlParams, t.Value)
switch t.Value.(type) {
case string:
sqlQuery += t.Field + " NOT LIKE ?"
default:
sqlQuery += t.Field + " IS NOT ?"
}
case *query.GreaterThan:
sqlParams = append(sqlParams, t.Value)
sqlQuery += t.Field + " > ?"
case *query.GreaterOrEqual:
sqlParams = append(sqlParams, t.Value)
sqlQuery += t.Field + " >= ?"
case *query.LowerThan:
sqlParams = append(sqlParams, t.Value)
sqlQuery += t.Field + " < ?"
case *query.LowerOrEqual:
sqlParams = append(sqlParams, t.Value)
sqlQuery += t.Field + " <= ?"
default:
return "", []interface{}{}, resource.ErrNotImplemented
}
}
return sqlQuery, sqlParams, nil
}
func buildSchemaQuery(s *schema.Schema) (sqlQuery string, sqlParams []interface{}, err error) {
sqlQuery = "etag VARCHAR(512),"
for fieldName, field := range s.Fields {
switch field.Validator.(type) {
case *schema.String:
f := field.Validator.(*schema.String)
sqlQuery += fmt.Sprintf("%s VARCHAR", fieldName)
if f.MaxLen > 0 {
sqlQuery += fmt.Sprintf("(%d)", f.MaxLen)
}
case *schema.Integer:
sqlQuery += fmt.Sprintf("%s INTEGER", fieldName)
case *schema.Float:
sqlQuery += fmt.Sprintf("%s FLOAT", fieldName)
case *schema.Bool:
sqlQuery += fmt.Sprintf("%s BIT(1)", fieldName)
case *schema.Time:
sqlQuery += fmt.Sprintf("%s TIMESTAMP", fieldName)
case *schema.URL:
sqlQuery += fmt.Sprintf("%s VARCHAR", fieldName)
default:
return "", []interface{}{}, resource.ErrNotImplemented
}
sqlQuery += ","
}
return sqlQuery[:len(sqlQuery)-1], []interface{}{}, nil
}
func transformQuery(sqlQuery string, sqlBackend string) (string) {
switch sqlBackend {
case "sqlite3", "mysql":
return sqlQuery
case "postgres":
return transformQuery_postgres(sqlQuery)
}
return sqlQuery
}
func transformQuery_postgres(sqlQuery string) (newSqlQuery string) {
idx := 1
for _, ch := range sqlQuery {
if ch == '?' {
newSqlQuery += fmt.Sprintf("$%d", idx)
idx++
} else {
newSqlQuery += string(ch)
}
}
return
}
func transformParams(sqlParams []interface{}, sqlBackend string) ([]interface{}) {
switch sqlBackend {
case "sqlite3", "mysql":
return sqlParams
case "postgres":
return transformParams_postgres(sqlParams)
}
return sqlParams
}
func transformParams_postgres(sqlParams []interface{}) ([]interface{}) {
var newSqlParams []interface{}
for _,p := range sqlParams {
t := reflect.TypeOf(p)
if t == nil {
newSqlParams = append(newSqlParams, p)
} else {
switch t.Kind() {
case reflect.Slice, reflect.Array:
newSqlParams = append(newSqlParams, pq.Array(p))
default:
newSqlParams = append(newSqlParams, p)
}
}
}
return newSqlParams
}