gosora/query_gen/acc_builders.go

package qgen

import (
    "database/sql"
    "strings"

    //"fmt"
    "strconv"
)

type accDeleteBuilder struct {
    table      string
    where      string
    dateCutoff *dateCutoff // We might want to do this in a slightly less hacky way

    build *Accumulator
}

func (b *accDeleteBuilder) Where(w string) *accDeleteBuilder {
    if b.where != "" {
        b.where += " AND "
    }
    b.where += w
    return b
}

func (b *accDeleteBuilder) DateCutoff(col string, quantity int, unit string) *accDeleteBuilder {
    b.dateCutoff = &dateCutoff{col, quantity, unit, 0}
    return b
}

func (b *accDeleteBuilder) DateOlderThan(col string, quantity int, unit string) *accDeleteBuilder {
    b.dateCutoff = &dateCutoff{col, quantity, unit, 1}
    return b
}

func (b *accDeleteBuilder) DateOlderThanQ(col, unit string) *accDeleteBuilder {
    b.dateCutoff = &dateCutoff{col, 0, unit, 11}
    return b
}

/*func (b *accDeleteBuilder) Prepare() *sql.Stmt {
    return b.build.SimpleDelete(b.table, b.where)
}*/

// TODO: Fix this nasty hack
func (b *accDeleteBuilder) Prepare() *sql.Stmt {
    // TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
    if b.dateCutoff != nil {
        dBuilder := b.build.GetAdapter().Builder().Delete().FromAcc(b)
        return b.build.prepare(b.build.GetAdapter().ComplexDelete(dBuilder))
    }
    return b.build.SimpleDelete(b.table, b.where)
}

func (b *accDeleteBuilder) Exec(args ...interface{}) (res sql.Result, e error) {
    stmt := b.Prepare()
    if stmt == nil {
        return res, b.build.FirstError()
    }
    return stmt.Exec(args...)
}

func (b *accDeleteBuilder) Run(args ...interface{}) (int, error) {
    res, e := b.Exec(args...)
    if e != nil {
        return 0, e
    }
    lastID, e := res.LastInsertId()
    return int(lastID), e
}

type accUpdateBuilder struct {
    up    *updatePrebuilder
    build *Accumulator
}

func (u *accUpdateBuilder) Set(set string) *accUpdateBuilder {
    u.up.set = set
    return u
}

func (u *accUpdateBuilder) Where(where string) *accUpdateBuilder {
    if u.up.where != "" {
        u.up.where += " AND "
    }
    u.up.where += where
    return u
}

func (b *accUpdateBuilder) DateCutoff(col string, quantity int, unit string) *accUpdateBuilder {
    b.up.dateCutoff = &dateCutoff{col, quantity, unit, 0}
    return b
}

func (b *accUpdateBuilder) DateOlderThan(col string, quantity int, unit string) *accUpdateBuilder {
    b.up.dateCutoff = &dateCutoff{col, quantity, unit, 1}
    return b
}

func (b *accUpdateBuilder) DateOlderThanQ(col, unit string) *accUpdateBuilder {
    b.up.dateCutoff = &dateCutoff{col, 0, unit, 11}
    return b
}

func (b *accUpdateBuilder) WhereQ(sel *selectPrebuilder) *accUpdateBuilder {
    b.up.whereSubQuery = sel
    return b
}

func (b *accUpdateBuilder) Prepare() *sql.Stmt {
    if b.up.whereSubQuery != nil {
        return b.build.prepare(b.build.adapter.SimpleUpdateSelect(b.up))
    }
    return b.build.prepare(b.build.adapter.SimpleUpdate(b.up))
}
func (b *accUpdateBuilder) Stmt() *sql.Stmt {
    if b.up.whereSubQuery != nil {
        return b.build.prepare(b.build.adapter.SimpleUpdateSelect(b.up))
    }
    return b.build.prepare(b.build.adapter.SimpleUpdate(b.up))
}

func (b *accUpdateBuilder) Exec(args ...interface{}) (res sql.Result, err error) {
    q, e := b.build.adapter.SimpleUpdate(b.up)
    if err != nil {
        return res, e
    }
    //fmt.Println("q:", q)
    return b.build.exec(q, args...)
}

type AccBuilder interface {
    Prepare() *sql.Stmt
}

type AccExec interface {
    Exec(args ...interface{}) (res sql.Result, err error)
}

type AccSelectBuilder struct {
    table      string
    columns    string
    where      string
    orderby    string
    limit      string
    dateCutoff *dateCutoff // We might want to do this in a slightly less hacky way
    inChain    *AccSelectBuilder
    inColumn   string

    build *Accumulator
}

func (b *AccSelectBuilder) Columns(cols string) *AccSelectBuilder {
    b.columns = cols
    return b
}

func (b *AccSelectBuilder) Cols(cols string) *AccSelectBuilder {
    b.columns = cols
    return b
}

func (b *AccSelectBuilder) Where(where string) *AccSelectBuilder {
    if b.where != "" {
        b.where += " AND "
    }
    b.where += where
    return b
}

// TODO: Don't implement the SQL at the accumulator level but the adapter level
func (b *AccSelectBuilder) In(col string, inList []int) *AccSelectBuilder {
    if len(inList) == 0 {
        return b
    }

    var wsb strings.Builder
    wsb.Grow(len(col) + 5 + 1 + len(b.where) + (len(inList) * 2))
    wsb.WriteString(col)
    wsb.WriteString(" IN(")
    for i, it := range inList {
        if i != 0 {
            wsb.WriteRune(',')
        }
        wsb.WriteString(strconv.Itoa(it))
    }
    if b.where != "" {
        wsb.WriteString(") AND ")
        wsb.WriteString(b.where)
    } else {
        wsb.WriteRune(')')
    }

    b.where = wsb.String()
    return b
}

// TODO: Don't implement the SQL at the accumulator level but the adapter level
func (b *AccSelectBuilder) InPQuery(col string, inList []int) (*sql.Rows, error) {
    if len(inList) == 0 {
        return nil, sql.ErrNoRows
    }
    // TODO: Optimise this
    where := col + " IN("

    idList := make([]interface{}, len(inList))
    for i, id := range inList {
        idList[i] = strconv.Itoa(id)
        where += "?,"
    }
    where = where[0:len(where)-1] + ")"

    if b.where != "" {
        where += " AND " + b.where
    }

    b.where = where
    return b.Query(idList...)
}

func (b *AccSelectBuilder) InQ(col string, sb *AccSelectBuilder) *AccSelectBuilder {
    b.inChain = sb
    b.inColumn = col
    return b
}

func (b *AccSelectBuilder) DateCutoff(col string, quantity int, unit string) *AccSelectBuilder {
    b.dateCutoff = &dateCutoff{col, quantity, unit, 0}
    return b
}

func (b *AccSelectBuilder) DateOlderThanQ(col, unit string) *AccSelectBuilder {
    b.dateCutoff = &dateCutoff{col, 0, unit, 11}
    return b
}

func (b *AccSelectBuilder) Orderby(orderby string) *AccSelectBuilder {
    b.orderby = orderby
    return b
}

func (b *AccSelectBuilder) Limit(limit string) *AccSelectBuilder {
    b.limit = limit
    return b
}

func (b *AccSelectBuilder) Prepare() *sql.Stmt {
    // TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
    if b.dateCutoff != nil || b.inChain != nil {
        selectBuilder := b.build.GetAdapter().Builder().Select().FromAcc(b)
        return b.build.prepare(b.build.GetAdapter().ComplexSelect(selectBuilder))
    }
    return b.build.SimpleSelect(b.table, b.columns, b.where, b.orderby, b.limit)
}

func (b *AccSelectBuilder) Stmt() *sql.Stmt {
    // TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
    if b.dateCutoff != nil || b.inChain != nil {
        selectBuilder := b.build.GetAdapter().Builder().Select().FromAcc(b)
        return b.build.prepare(b.build.GetAdapter().ComplexSelect(selectBuilder))
    }
    return b.build.SimpleSelect(b.table, b.columns, b.where, b.orderby, b.limit)
}

func (b *AccSelectBuilder) ComplexPrepare() *sql.Stmt {
    selectBuilder := b.build.GetAdapter().Builder().Select().FromAcc(b)
    return b.build.prepare(b.build.GetAdapter().ComplexSelect(selectBuilder))
}

func (b *AccSelectBuilder) query() (string, error) {
    // TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
    if b.dateCutoff != nil || b.inChain != nil {
        selectBuilder := b.build.GetAdapter().Builder().Select().FromAcc(b)
        return b.build.GetAdapter().ComplexSelect(selectBuilder)
    }
    return b.build.adapter.SimpleSelect("", b.table, b.columns, b.where, b.orderby, b.limit)
}

func (b *AccSelectBuilder) Query(args ...interface{}) (*sql.Rows, error) {
    stmt := b.Prepare()
    if stmt != nil {
        return stmt.Query(args...)
    }
    return nil, b.build.FirstError()
}

type AccRowWrap struct {
    row *sql.Row
    err error
}

func (w *AccRowWrap) Scan(dest ...interface{}) error {
    if w.err != nil {
        return w.err
    }
    return w.row.Scan(dest...)
}

// TODO: Test to make sure the errors are passed up properly
func (b *AccSelectBuilder) QueryRow(args ...interface{}) *AccRowWrap {
    stmt := b.Prepare()
    if stmt != nil {
        return &AccRowWrap{stmt.QueryRow(args...), nil}
    }
    return &AccRowWrap{nil, b.build.FirstError()}
}

// Experimental, reduces lines
func (b *AccSelectBuilder) Each(h func(*sql.Rows) error) error {
    query, e := b.query()
    if e != nil {
        return e
    }
    rows, e := b.build.query(query)
    if e != nil {
        return e
    }
    defer rows.Close()
    for rows.Next() {
        if e = h(rows); e != nil {
            return e
        }
    }
    return rows.Err()
}
func (b *AccSelectBuilder) EachP(h func(*sql.Rows) error, p ...interface{}) error {
    query, e := b.query()
    if e != nil {
        return e
    }
    rows, e := b.build.query(query, p)
    if e != nil {
        return e
    }
    defer rows.Close()
    for rows.Next() {
        if e = h(rows); e != nil {
            return e
        }
    }
    return rows.Err()
}
func (b *AccSelectBuilder) EachInt(h func(int) error) error {
    query, e := b.query()
    if e != nil {
        return e
    }
    rows, e := b.build.query(query)
    if e != nil {
        return e
    }
    defer rows.Close()
    for rows.Next() {
        var theInt int
        if e = rows.Scan(&theInt); e != nil {
            return e
        }
        if e = h(theInt); e != nil {
            return e
        }
    }
    return rows.Err()
}

type accInsertBuilder struct {
    table   string
    columns string
    fields  string

    build *Accumulator
}

func (b *accInsertBuilder) Columns(cols string) *accInsertBuilder {
    b.columns = cols
    return b
}

func (b *accInsertBuilder) Fields(fields string) *accInsertBuilder {
    b.fields = fields
    return b
}

func (b *accInsertBuilder) Prepare() *sql.Stmt {
    return b.build.SimpleInsert(b.table, b.columns, b.fields)
}

func (b *accInsertBuilder) Exec(args ...interface{}) (res sql.Result, e error) {
    q, e := b.build.adapter.SimpleInsert("", b.table, b.columns, b.fields)
    if e != nil {
        return res, e
    }
    return b.build.exec(q, args...)
}

func (b *accInsertBuilder) Run(args ...interface{}) (int, error) {
    res, e := b.Exec(args...)
    if e != nil {
        return 0, e
    }
    lastID, e := res.LastInsertId()
    return int(lastID), e
}

type accBulkInsertBuilder struct {
    table    string
    columns  string
    fieldSet []string

    build *Accumulator
}

func (b *accBulkInsertBuilder) Columns(cols string) *accBulkInsertBuilder {
    b.columns = cols
    return b
}

func (b *accBulkInsertBuilder) Fields(fieldSet ...string) *accBulkInsertBuilder {
    b.fieldSet = fieldSet
    return b
}

func (b *accBulkInsertBuilder) Prepare() *sql.Stmt {
    return b.build.SimpleBulkInsert(b.table, b.columns, b.fieldSet)
}

func (b *accBulkInsertBuilder) Exec(args ...interface{}) (res sql.Result, err error) {
    q, e := b.build.adapter.SimpleBulkInsert("", b.table, b.columns, b.fieldSet)
    if e != nil {
        return res, e
    }
    return b.build.exec(q, args...)
}

func (b *accBulkInsertBuilder) Run(args ...interface{}) (int, error) {
    res, e := b.Exec(args...)
    if e != nil {
        return 0, e
    }
    lastID, e := res.LastInsertId()
    return int(lastID), e
}

type accCountBuilder struct {
    table      string
    where      string
    limit      string
    dateCutoff *dateCutoff // We might want to do this in a slightly less hacky way
    inChain    *AccSelectBuilder
    inColumn   string

    build *Accumulator
}

func (b *accCountBuilder) Where(w string) *accCountBuilder {
    if b.where != "" {
        b.where += " AND "
    }
    b.where += w
    return b
}

func (b *accCountBuilder) Limit(limit string) *accCountBuilder {
    b.limit = limit
    return b
}

func (b *accCountBuilder) DateCutoff(col string, quantity int, unit string) *accCountBuilder {
    b.dateCutoff = &dateCutoff{col, quantity, unit, 0}
    return b
}

func (b *accCountBuilder) DateOlderThanQ(col, unit string) *accCountBuilder {
    b.dateCutoff = &dateCutoff{col, 0, unit, 11}
    return b
}

// TODO: Fix this nasty hack
func (b *accCountBuilder) Prepare() *sql.Stmt {
    // TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
    if b.dateCutoff != nil || b.inChain != nil {
        selBuilder := b.build.GetAdapter().Builder().Count().FromCountAcc(b)
        selBuilder.columns = "COUNT(*)"
        return b.build.prepare(b.build.GetAdapter().ComplexSelect(selBuilder))
    }
    return b.build.SimpleCount(b.table, b.where, b.limit)
}
// TODO: Fix this nasty hack
func (b *accCountBuilder) Stmt() *sql.Stmt {
    // TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
    if b.dateCutoff != nil || b.inChain != nil {
        selBuilder := b.build.GetAdapter().Builder().Count().FromCountAcc(b)
        selBuilder.columns = "COUNT(*)"
        return b.build.prepare(b.build.GetAdapter().ComplexSelect(selBuilder))
    }
    return b.build.SimpleCount(b.table, b.where, b.limit)
}

func (b *accCountBuilder) Total() (total int, e error) {
    stmt := b.Prepare()
    if stmt == nil {
        return 0, b.build.FirstError()
    }
    e = stmt.QueryRow().Scan(&total)
    return total, e
}

func (b *accCountBuilder) TotalP(params ...interface{}) (total int, e error) {
    stmt := b.Prepare()
    if stmt == nil {
        return 0, b.build.FirstError()
    }
    e = stmt.QueryRow(params).Scan(&total)
    return total, e
}

// TODO: Add a Sum builder for summing viewchunks up into one number for the dashboard?