149 lines
3 KiB
Go
149 lines
3 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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const (
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union = "UNION"
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intersect = "INTERSECT"
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except = "EXCEPT"
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)
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type SetStatement interface {
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Statement
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ORDER_BY(clauses ...OrderByClause) SetStatement
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LIMIT(limit int64) SetStatement
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OFFSET(offset int64) SetStatement
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}
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func UNION(selects ...SelectStatement) SetStatement {
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return newSetStatementImpl(union, false, selects...)
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}
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func UNION_ALL(selects ...SelectStatement) SetStatement {
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return newSetStatementImpl(union, true, selects...)
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}
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func INTERSECT(selects ...SelectStatement) SetStatement {
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return newSetStatementImpl(intersect, false, selects...)
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}
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func INTERSECT_ALL(selects ...SelectStatement) SetStatement {
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return newSetStatementImpl(intersect, true, selects...)
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}
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func EXCEPT(selects ...SelectStatement) SetStatement {
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return newSetStatementImpl(except, false, selects...)
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}
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func EXCEPT_ALL(selects ...SelectStatement) SetStatement {
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return newSetStatementImpl(except, true, selects...)
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}
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// Similar to selectStatementImpl, but less complete
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type setStatementImpl struct {
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operator string
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selects []SelectStatement
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orderBy []OrderByClause
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limit, offset int64
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// True if results of the union should be deduped.
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all bool
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}
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func newSetStatementImpl(operator string, all bool, selects ...SelectStatement) *setStatementImpl {
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return &setStatementImpl{
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operator: operator,
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selects: selects,
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limit: -1,
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offset: -1,
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all: all,
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}
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}
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func (us *setStatementImpl) ORDER_BY(orderBy ...OrderByClause) SetStatement {
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us.orderBy = orderBy
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return us
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}
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func (us *setStatementImpl) LIMIT(limit int64) SetStatement {
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us.limit = limit
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return us
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}
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func (us *setStatementImpl) OFFSET(offset int64) SetStatement {
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us.offset = offset
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return us
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}
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func (s *setStatementImpl) Serialize(out *queryData, options ...serializeOption) error {
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if len(s.selects) < 2 {
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return errors.Newf("UNION statement must have at least two SELECT statements.")
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}
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out.WriteString("(")
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for i, selectStmt := range s.selects {
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if i > 0 {
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out.WriteString(" " + s.operator + " ")
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if s.all {
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out.WriteString(" ALL ")
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}
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}
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err := selectStmt.Serialize(out, options...)
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if err != nil {
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return err
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}
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}
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out.WriteString(")")
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out.statementType = set_statement
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if s.orderBy != nil {
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err := out.WriteOrderBy(s.orderBy)
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if err != nil {
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return err
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}
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}
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if s.limit >= 0 {
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out.WriteString(" LIMIT ")
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out.InsertArgument(s.limit)
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}
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if s.offset >= 0 {
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out.WriteString(" OFFSET ")
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out.InsertArgument(s.offset)
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}
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return nil
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}
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func (us *setStatementImpl) Sql() (query string, args []interface{}, err error) {
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queryData := &queryData{}
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err = us.Serialize(queryData)
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if err != nil {
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return
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}
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return queryData.buff.String(), queryData.args, nil
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}
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func (s *setStatementImpl) Query(db types.Db, destination interface{}) error {
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return Query(s, db, destination)
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}
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func (u *setStatementImpl) 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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