139 lines
2.7 KiB
Go
139 lines
2.7 KiB
Go
package sqlbuilder
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import (
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"database/sql"
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"github.com/dropbox/godropbox/errors"
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"github.com/sub0zero/go-sqlbuilder/types"
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)
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type updateStatement interface {
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statement
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SET(values ...interface{}) updateStatement
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WHERE(expression boolExpression) updateStatement
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RETURNING(projections ...projection) updateStatement
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}
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func newUpdateStatement(table writableTable, columns []column) updateStatement {
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return &updateStatementImpl{
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table: table,
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columns: columns,
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}
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}
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type updateStatementImpl struct {
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table writableTable
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columns []column
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updateValues []clause
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where boolExpression
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returning []projection
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}
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func (u *updateStatementImpl) SET(values ...interface{}) updateStatement {
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for _, value := range values {
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if clause, ok := value.(clause); ok {
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u.updateValues = append(u.updateValues, clause)
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} else {
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u.updateValues = append(u.updateValues, Literal(value))
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}
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}
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return u
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}
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func (u *updateStatementImpl) WHERE(expression boolExpression) updateStatement {
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u.where = expression
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return u
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}
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func (u *updateStatementImpl) RETURNING(projections ...projection) updateStatement {
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u.returning = defaultProjectionAliasing(projections)
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return u
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}
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func (u *updateStatementImpl) Sql() (sql string, args []interface{}, err error) {
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out := &queryData{}
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out.writeString("UPDATE ")
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if u.table == nil {
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return "", nil, errors.New("nil tableName.")
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}
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if err = u.table.serialize(update_statement, out); err != nil {
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return
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}
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if len(u.updateValues) == 0 {
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return "", nil, errors.New("No column updated.")
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}
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out.writeString(" SET")
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if len(u.columns) > 1 {
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out.writeString(" ( ")
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} else {
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out.writeString(" ")
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}
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err = serializeColumnList(update_statement, u.columns, out)
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if err != nil {
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return "", nil, err
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}
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if len(u.columns) > 1 {
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out.writeString(" )")
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}
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out.writeString(" =")
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if len(u.updateValues) > 1 {
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out.writeString(" (")
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}
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for i, value := range u.updateValues {
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if i > 0 {
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out.writeString(", ")
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}
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err = value.serialize(update_statement, out)
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if err != nil {
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return
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}
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}
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if len(u.updateValues) > 1 {
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out.writeString(" )")
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}
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if u.where == nil {
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return "", nil, errors.New("Updating without a WHERE clause.")
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}
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if err = out.writeWhere(update_statement, u.where); err != nil {
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return
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}
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if len(u.returning) > 0 {
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out.writeString(" RETURNING ")
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err = serializeProjectionList(update_statement, u.returning, out)
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if err != nil {
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return
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}
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}
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return out.buff.String(), out.args, nil
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}
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func (u *updateStatementImpl) Query(db types.Db, destination interface{}) error {
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return Query(u, db, destination)
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}
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func (u *updateStatementImpl) Execute(db types.Db) (res sql.Result, err error) {
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return Execute(u, db)
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}
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