func (t *Table) SQL(db *DB, b Backend, m driver.Model, name string) (string, error) {
var lines []string
var constraints []string
for _, v := range t.Fields {
def, cons, err := v.SQL(db, m, t)
if err != nil {
return "", err
}
lines = append(lines, def)
constraints = append(constraints, cons...)
}
pk, err := t.definePks(db, m)
if err != nil {
return "", err
}
if pk != "" {
lines = append(lines, pk)
}
lines = append(lines, constraints...)
if name == "" {
name = m.Table()
}
// Use IF NOT EXISTS, since the DB user might not have
// the privileges to inspect the database but still
// be allowed to read and write from the tables (e.g.
// Postgres only allows superusers and the owner to
// inspect the database).
sql := fmt.Sprintf("\nCREATE TABLE IF NOT EXISTS %s (\n\t%s\n)", db.QuoteIdentifier(name), strings.Join(lines, ",\n\t"))
return sql, nil
}
func (d *Driver) Update(m driver.Model, q query.Q, data interface{}) (driver.Result, error) {
_, fields, values, err := d.saveParameters(m, data)
if err != nil {
return nil, err
}
buf := getBuffer()
buf.WriteString("UPDATE ")
buf.WriteByte('"')
buf.WriteString(m.Table())
buf.WriteByte('"')
buf.WriteString(" SET ")
for ii, v := range fields {
buf.WriteByte('"')
buf.WriteString(v)
buf.WriteByte('"')
buf.WriteByte('=')
buf.WriteString(d.backend.Placeholder(ii))
buf.WriteByte(',')
}
// remove last ,
buf.Truncate(buf.Len() - 1)
qParams, err := d.where(buf, m, q, len(values))
if err != nil {
return nil, err
}
params := append(values, qParams...)
res, err := d.db.Exec(buftos(buf), params...)
putBuffer(buf)
return res, err
}
func (d *Driver) Insert(m driver.Model, data interface{}) (driver.Result, error) {
_, fields, values, err := d.saveParameters(m, data)
if err != nil {
return nil, err
}
buf := getBuffer()
buf.WriteString("INSERT INTO ")
buf.WriteByte('"')
buf.WriteString(m.Table())
buf.WriteByte('"')
count := len(fields)
if count > 0 {
buf.WriteString(" (")
for _, v := range fields {
buf.WriteByte('"')
buf.WriteString(v)
buf.WriteByte('"')
buf.WriteByte(',')
}
buf.Truncate(buf.Len() - 1)
buf.WriteString(") VALUES (")
buf.WriteString(d.backend.Placeholders(count))
buf.WriteByte(')')
} else {
buf.WriteByte(' ')
buf.WriteString(d.backend.DefaultValues())
}
res, err := d.backend.Insert(d.db, m, buftos(buf), values...)
putBuffer(buf)
return res, err
}
func (d *Driver) makeQuery(m driver.Model, q query.Q, opts *driver.QueryOptions) (*datastore.Query, error) {
if m.Join() != nil {
return nil, errJoinNotSupported
}
dq := datastore.NewQuery(m.Table()).Ancestor(d.parentKey(m))
var err error
if dq, err = d.applyQuery(m, dq, q); err != nil {
return nil, err
}
if opts != nil {
if opts.Distinct {
dq = dq.Distinct()
}
for _, v := range opts.Sort {
field := v.Field()
if v.Direction() == driver.DESC {
field = "-" + field
}
dq = dq.Order(field)
}
if opts.Limit >= 0 {
dq = dq.Limit(opts.Limit)
}
if opts.Offset > 0 {
dq = dq.Offset(opts.Offset)
}
}
return dq, nil
}
func (d *Driver) Operate(m driver.Model, q query.Q, ops []*operation.Operation) (driver.Result, error) {
buf := getBuffer()
buf.WriteString("UPDATE ")
buf.WriteByte('"')
buf.WriteString(m.Table())
buf.WriteByte('"')
buf.WriteString(" SET ")
var params []interface{}
for ii, op := range ops {
if ii > 0 {
buf.WriteByte(',')
}
dbName, _, err := m.Map(op.Field)
if err != nil {
return nil, err
}
dbName = unquote(dbName)
buf.WriteByte('"')
buf.WriteString(dbName)
buf.WriteByte('"')
buf.WriteByte('=')
switch op.Operator {
case operation.OpAdd, operation.OpSub:
buf.WriteString(dbName)
if op.Operator == operation.OpAdd {
buf.WriteByte('+')
} else {
buf.WriteByte('-')
}
buf.WriteString(d.backend.Placeholder(len(params)))
params = append(params, op.Value)
case operation.OpSet:
if f, ok := op.Value.(operation.Field); ok {
fieldName, _, err := m.Map(string(f))
if err != nil {
return nil, err
}
buf.WriteString(unquote(fieldName))
} else {
buf.WriteString(d.backend.Placeholder(len(params)))
val, err := d.transformOutValue(op.Value)
if err != nil {
return nil, err
}
params = append(params, val)
}
default:
return nil, fmt.Errorf("operator %d is not supported", op.Operator)
}
}
qParams, err := d.where(buf, m, q, len(params))
if err != nil {
return nil, err
}
params = append(params, qParams...)
res, err := d.db.Exec(buftos(buf), params...)
putBuffer(buf)
return res, err
}
func (d *Driver) createTable(m driver.Model, table *Table) error {
sql, err := table.SQL(d.db, d.backend, m, m.Table())
if err != nil {
return err
}
_, err = d.db.Exec(sql)
return err
}
func (b *Backend) HasIndex(db *sql.DB, m driver.Model, idx *index.Index, name string) (bool, error) {
rows, err := db.Query("SHOW INDEX FROM ? WHERE Key_name = ?", m.Table(), name)
if err != nil {
return false, err
}
has := rows.Next()
rows.Close()
return has, nil
}
func (b *Backend) Inspect(db *sql.DB, m driver.Model) (*sql.Table, error) {
name := db.QuoteString(m.Table())
rows, err := db.Query(fmt.Sprintf("PRAGMA table_info(%s)", name))
if err != nil {
return nil, err
}
defer rows.Close()
fieldsByName := make(map[string]*sql.Field)
var fields []*sql.Field
for rows.Next() {
var cid int
var f sql.Field
var notnull int
var def *string
var pk int
if err := rows.Scan(&cid, &f.Name, &f.Type, ¬null, &def, &pk); err != nil {
return nil, err
}
f.Type = strings.ToUpper(f.Type)
if notnull != 0 {
f.AddConstraint(sql.ConstraintNotNull)
}
if def != nil {
f.Default = *def
}
if pk != 0 {
f.AddConstraint(sql.ConstraintPrimaryKey)
}
fields = append(fields, &f)
fieldsByName[f.Name] = &f
}
if err := rows.Err(); err != nil {
return nil, err
}
rows, err = db.Query(fmt.Sprintf("PRAGMA foreign_key_list(%s)", name))
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var id, seq int
var table, from, to, onUpdate, onDelete, match string
if err := rows.Scan(&id, &seq, &table, &from, &to, &onUpdate, &onDelete, &match); err != nil {
return nil, err
}
field := fieldsByName[from]
field.Constraints = append(field.Constraints, &sql.Constraint{Type: sql.ConstraintForeignKey, References: sql.MakeReference(table, to)})
}
if err := rows.Err(); err != nil {
return nil, err
}
if len(fields) > 0 {
return &sql.Table{Fields: fields}, nil
}
return nil, nil
}
func (d *Driver) Delete(m driver.Model, q query.Q) (driver.Result, error) {
buf := getBuffer()
buf.WriteString("DELETE FROM ")
buf.WriteByte('"')
buf.WriteString(m.Table())
buf.WriteByte('"')
params, err := d.where(buf, m, q, 0)
if err != nil {
return nil, err
}
res, err := d.db.Exec(buftos(buf), params...)
putBuffer(buf)
return res, err
}
func (b *SqlBackend) AddFields(db *DB, m driver.Model, prevTable *Table, newTable *Table, fields []*Field) error {
modelFields := m.Fields()
tableName := db.QuoteIdentifier(m.Table())
for _, v := range fields {
idx := modelFields.MNameMap[v.Name]
field := v
hasDefault := modelFields.HasDefault(idx)
if hasDefault && v.HasConstraint(ConstraintNotNull) {
// ORM level default
// Must be added as nullable first, then the default value
// must be set and finally the field has to be altered to be
// nullable.
field = field.Copy()
var constraints []*Constraint
for _, v := range field.Constraints {
if v.Type != ConstraintNotNull {
constraints = append(constraints, v)
}
}
field.Constraints = constraints
}
sql, cons, err := field.SQL(db, m, newTable)
if err != nil {
return err
}
if _, err = db.Exec(fmt.Sprintf("ALTER TABLE %s ADD COLUMN %s", tableName, sql)); err != nil {
return err
}
if hasDefault {
value := modelFields.DefaultValue(idx)
fieldName := db.QuoteIdentifier(v.Name)
if _, err := db.Exec(fmt.Sprintf("UPDATE %s SET %s = ?", tableName, fieldName), value); err != nil {
return err
}
if v.HasConstraint(ConstraintNotNull) {
if err := db.Backend().AlterField(db, m, newTable, field, v); err != nil {
return err
}
}
}
for _, c := range cons {
if _, err = db.Exec(fmt.Sprintf("ALTER TABLE %s ADD CONSTRAINT %s", tableName, c)); err != nil {
return err
}
}
}
return nil
}
func (b *Backend) AlterField(db *sql.DB, m driver.Model, table *sql.Table, oldField *sql.Field, newField *sql.Field) error {
fsql, cons, err := newField.SQL(db, m, table)
if err != nil {
return err
}
tableName := db.QuoteIdentifier(m.Table())
if _, err = db.Exec(fmt.Sprintf("ALTER TABLE %s CHANGE COLUMN %s %s", tableName, db.QuoteIdentifier(oldField.Name), fsql)); err != nil {
return err
}
for _, c := range cons {
if _, err = db.Exec(fmt.Sprintf("ALTER TABLE %s ADD CONSTRAINT %s", tableName, c)); err != nil {
return err
}
}
return err
}
func (b *Backend) DefineField(db *sql.DB, m driver.Model, table *sql.Table, field *sql.Field) (string, []string, error) {
def, cons, err := b.SqlBackend.DefineField(db, m, table, field)
if err != nil {
return "", nil, err
}
if ref := field.Constraint(sql.ConstraintForeignKey); ref != nil {
if pos := strings.Index(def, " REFERENCES"); pos >= 0 {
def = def[:pos]
}
refTable := ref.References.Table()
refField := ref.References.Field()
fkName := db.QuoteIdentifier(fmt.Sprintf("%s_%s_%s_%s", m.Table(), field.Name, refTable, refField))
cons = append(cons, fmt.Sprintf("FOREIGN KEY %s(%s) REFERENCES %s(%s)", fkName, db.QuoteIdentifier(field.Name),
db.QuoteIdentifier(refTable), db.QuoteIdentifier(refField)))
}
return strings.Replace(def, "AUTOINCREMENT", "AUTO_INCREMENT", -1), cons, nil
}
func (d *Driver) mergeTable(m driver.Model, prevTable *Table, newTable *Table) error {
existing := make(map[string]*Field)
for _, v := range prevTable.Fields {
existing[v.Name] = v
}
var missing []*Field
for _, v := range newTable.Fields {
prev := existing[v.Name]
if prev == nil {
// Check if we can add the field
if v.HasConstraint(ConstraintNotNull) && !fieldHasDefault(m, v) {
return fmt.Errorf("can't add NOT NULL field %q to table %q without a default value", v.Name, m.Table())
}
if v.HasConstraint(ConstraintPrimaryKey) {
return fmt.Errorf("can't add PRIMARY KEY field %q to table %q", v.Name, m.Table())
}
missing = append(missing, v)
} else {
if prev.Type != v.Type {
// Check the Kind
k1, len1 := TypeKind(prev.Type)
k2, len2 := TypeKind(v.Type)
if k1 == k2 {
// Check lengths
if len1 != len2 {
}
continue
}
// Check if we can transform the kind
fields := m.Fields()
idx := fields.MNameMap[v.Name]
modelName := fields.QNames[idx]
modelType := fields.Types[idx]
return fmt.Errorf("field %q on table %q is of type %s which is not compatible with the model field %q of type %s (%s)",
v.Name, m.Table(), prev.Type, modelName, v.Type, modelType)
}
}
}
if len(missing) > 0 {
if err := d.backend.AddFields(d.db, m, prevTable, newTable, missing); err != nil {
return err
}
}
return nil
}
func (b *Backend) AddFields(db *sql.DB, m driver.Model, prevTable *sql.Table, newTable *sql.Table, fields []*sql.Field) error {
rewrite := false
for _, v := range fields {
if !b.canAddField(v) {
rewrite = true
break
}
}
if rewrite {
name := db.QuoteIdentifier(m.Table())
tmpName := fmt.Sprintf("%s_%s", m.Table(), stringutil.Random(8))
quotedTmpName := db.QuoteIdentifier(tmpName)
createSql, err := newTable.SQL(db, b, m, tmpName)
if err != nil {
return err
}
if _, err := db.Exec(createSql); err != nil {
return err
}
fieldNames := generic.Map(prevTable.Fields, func(f *sql.Field) string { return f.Name }).([]string)
// The previous table might have fields that we're not part
// of the new table.
fieldSet := make(map[string]bool)
for _, v := range newTable.Fields {
fieldSet[v.Name] = true
}
fieldNames = generic.Filter(fieldNames, func(n string) bool { return fieldSet[n] }).([]string)
sqlFields := strings.Join(generic.Map(fieldNames, db.QuoteIdentifier).([]string), ", ")
copySql := fmt.Sprintf("INSERT INTO %s (%s) SELECT %s FROM %s", quotedTmpName, sqlFields, sqlFields, name)
if _, err := db.Exec(copySql); err != nil {
return err
}
if _, err := db.Exec(fmt.Sprintf("DROP TABLE %s", name)); err != nil {
return err
}
if _, err := db.Exec(fmt.Sprintf("ALTER TABLE %s RENAME TO %s", quotedTmpName, name)); err != nil {
return err
}
return nil
}
return b.SqlBackend.AddFields(db, m, prevTable, newTable, fields)
}
func (d *Driver) createIndex(m driver.Model, idx *index.Index, name string) error {
has, err := d.backend.HasIndex(d.db, m, idx, name)
if err != nil {
return err
}
if has {
return nil
}
buf := getBuffer()
buf.WriteString("CREATE ")
if idx.Unique {
buf.WriteString("UNIQUE ")
}
buf.WriteString("INDEX ")
buf.WriteString(name)
buf.WriteString(" ON \"")
buf.WriteString(m.Table())
buf.WriteString("\" (")
fields := m.Fields()
for _, v := range idx.Fields {
name, _, err := fields.Map(v)
if err != nil {
return err
}
buf.WriteByte('"')
buf.WriteString(name)
buf.WriteByte('"')
if DescField(idx, v) {
buf.WriteString(" DESC")
}
buf.WriteByte(',')
}
buf.Truncate(buf.Len() - 1)
buf.WriteString(")")
_, err = d.db.Exec(buftos(buf))
putBuffer(buf)
return err
}
func (d *Driver) Insert(m driver.Model, data interface{}) (driver.Result, error) {
var id int64
fields := m.Fields()
var pkVal *reflect.Value
// TODO: If the PK is supplied by the user rather than auto-assigned, it
// might conflict with PKs generated by datastore.AllocateIDs().
if fields.PrimaryKey >= 0 {
p := d.primaryKey(fields, data)
if p.IsValid() && types.Kind(p.Kind()) == types.Int {
id = p.Int()
if id == 0 {
// Must assign PK field value after calling AllocateIDs
pkVal = &p
}
}
}
name := m.Table()
// Make all objects of a given kind ancestors of the same key. While
// this hurts scalability, it makes all reads strongly consistent.
parent := d.parentKey(m)
var err error
if id == 0 {
id, _, err = datastore.AllocateIDs(d.c, name, parent, 1)
if err != nil {
return nil, err
}
}
if fields.AutoincrementPk && pkVal != nil {
pkVal.SetInt(int64(id))
}
key := datastore.NewKey(d.c, name, "", id, parent)
log.Debugf("DATASTORE: put %s %v", key, data)
_, err = datastore.Put(d.c, key, data)
if err != nil {
return nil, err
}
return &result{key: key, count: 1}, nil
}
func (d *Driver) indexName(m driver.Model, idx *index.Index) (string, error) {
if len(idx.Fields) == 0 {
return "", fmt.Errorf("index on %v has no fields", m.Type())
}
buf := getBuffer()
buf.WriteString(m.Table())
for _, v := range idx.Fields {
dbName, _, err := m.Map(v)
if err != nil {
return "", err
}
buf.WriteByte('_')
// dbName is quoted and includes the table name
// extract the unquoted field name.
buf.WriteString(unquote(dbName))
if DescField(idx, v) {
buf.WriteString("_desc")
}
}
s := buf.String()
putBuffer(buf)
return s, nil
}
func (d *Driver) selectStmt(buf *bytes.Buffer, params *[]interface{}, fields []string, quote bool, m driver.Model, opts driver.QueryOptions) error {
buf.WriteString("SELECT ")
if opts.Distinct {
buf.WriteString("DISTINCT ")
}
if fields != nil {
if quote {
for _, v := range fields {
buf.WriteByte('"')
buf.WriteString(v)
buf.WriteByte('"')
buf.WriteByte(',')
}
} else {
for _, v := range fields {
buf.WriteString(v)
buf.WriteByte(',')
}
}
} else {
// Select all fields for the given model (which might be joined)
cur := m
for {
if !cur.Skip() {
for _, v := range cur.Fields().QuotedNames {
buf.WriteString(v)
buf.WriteByte(',')
}
}
join := cur.Join()
if join == nil {
break
}
cur = join.Model()
}
}
buf.Truncate(buf.Len() - 1)
buf.WriteString(" FROM ")
buf.WriteByte('"')
buf.WriteString(m.Table())
buf.WriteByte('"')
for join := m.Join(); join != nil; {
jm := join.Model()
switch join.Type() {
case driver.OuterJoin:
buf.WriteString(" FULL OUTER")
case driver.LeftJoin:
buf.WriteString(" LEFT OUTER")
case driver.RightJoin:
buf.WriteString(" RIGHT OUTER")
}
buf.WriteString(" JOIN ")
buf.WriteByte('"')
buf.WriteString(jm.Table())
buf.WriteByte('"')
buf.WriteString(" ON ")
if err := d.condition(buf, params, m, join.Query(), len(*params)); err != nil {
return err
}
join = jm.Join()
}
return nil
}
func (b *SqlBackend) Inspect(db *DB, m driver.Model, schema string) (*Table, error) {
var val int
name := db.QuoteString(m.Table())
s := db.QuoteString(schema)
eq := fmt.Sprintf("SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE "+
"TABLE_NAME = %s AND TABLE_SCHEMA = %s", name, s)
err := db.QueryRow(eq).Scan(&val)
if err != nil {
if err == ErrNoRows {
return nil, nil
}
return nil, err
}
// Select fields with their types
iq := fmt.Sprintf("SELECT COLUMN_NAME, IS_NULLABLE, DATA_TYPE, "+
"CHARACTER_MAXIMUM_LENGTH FROM INFORMATION_SCHEMA.COLUMNS "+
"WHERE TABLE_NAME = %s AND TABLE_SCHEMA = %s", name, s)
rows, err := db.Query(iq)
if err != nil {
return nil, err
}
defer rows.Close()
var fields []*Field
fieldsByName := make(map[string]*Field)
for rows.Next() {
var f Field
var nullable string
var maxLength *int
if err := rows.Scan(&f.Name, &nullable, &f.Type, &maxLength); err != nil {
return nil, err
}
if maxLength != nil {
f.Type = fmt.Sprintf("%s (%d)", f.Type, *maxLength)
}
f.Type = strings.ToUpper(f.Type)
if nullable != "YES" {
f.AddConstraint(ConstraintNotNull)
}
fields = append(fields, &f)
fieldsByName[f.Name] = &f
}
// Field constraints
cq := fmt.Sprintf("SELECT C.CONSTRAINT_NAME, CONSTRAINT_TYPE, COLUMN_NAME "+
"FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS C JOIN "+
"INFORMATION_SCHEMA.KEY_COLUMN_USAGE K ON C.CONSTRAINT_NAME = "+
"K.CONSTRAINT_NAME WHERE C.TABLE_NAME = %s AND K.TABLE_NAME = %s "+
"AND C.TABLE_SCHEMA = %s", name, name, s)
rows, err = db.Query(cq)
if err != nil {
return nil, err
}
foreignKeys := make(map[string]string)
defer rows.Close()
for rows.Next() {
var constraintName string
var constraintType string
var name string
if err := rows.Scan(&constraintName, &constraintType, &name); err != nil {
return nil, err
}
field := fieldsByName[name]
if field == nil {
return nil, fmt.Errorf("table %s has constraint on non-existing field %s", m.Table(), name)
}
switch strings.ToLower(constraintType) {
case "primary key":
field.AddConstraint(ConstraintPrimaryKey)
case "foreign key":
foreignKeys[constraintName] = name
case "unique":
field.AddConstraint(ConstraintUnique)
default:
return nil, fmt.Errorf("unknown constraint type %s on field %s in table %s", constraintType, name, m.Table())
}
}
if len(foreignKeys) > 0 {
// Resolve FKs
fks := strings.Join(generic.Map(generic.Keys(foreignKeys).([]string), db.QuoteString).([]string), ", ")
fq := fmt.Sprintf("SELECT CONSTRAINT_NAME, TABLE_NAME, COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE CONSTRAINT_NAME IN (%s)", fks)
rows, err := db.Query(fq)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var constraintName string
var tableName string
var columnName string
if err := rows.Scan(&constraintName, &tableName, &columnName); err != nil {
return nil, err
}
fieldName := foreignKeys[constraintName]
// Field was validated previously, won't be nil
field := fieldsByName[fieldName]
field.Constraints = append(field.Constraints, &Constraint{Type: ConstraintForeignKey, References: MakeReference(tableName, columnName)})
}
}
return &Table{Fields: fields}, nil
}
func (d *Driver) parentKey(m driver.Model) *datastore.Key {
return datastore.NewKey(d.c, m.Table(), "", -1, nil)
}
