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table.go
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table.go
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package jet
import (
"errors"
"github.com/go-jet/jet/internal/utils"
)
type table interface {
columns() []column
}
type readableTable interface {
// Generates a select query on the current tableName.
SELECT(projection projection, projections ...projection) SelectStatement
// Creates a inner join tableName Expression using onCondition.
INNER_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable
// Creates a left join tableName Expression using onCondition.
LEFT_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable
// Creates a right join tableName Expression using onCondition.
RIGHT_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable
// Creates a full join tableName Expression using onCondition.
FULL_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable
// Creates a cross join tableName Expression using onCondition.
CROSS_JOIN(table ReadableTable) ReadableTable
}
type writableTable interface {
INSERT(columns ...column) InsertStatement
UPDATE(column column, columns ...column) UpdateStatement
DELETE() DeleteStatement
LOCK() LockStatement
}
// ReadableTable interface
type ReadableTable interface {
table
readableTable
clause
}
// WritableTable interface
type WritableTable interface {
table
writableTable
clause
}
// Table interface
type Table interface {
table
readableTable
writableTable
clause
SchemaName() string
TableName() string
AS(alias string)
}
type readableTableInterfaceImpl struct {
parent ReadableTable
}
// Generates a select query on the current tableName.
func (r *readableTableInterfaceImpl) SELECT(projection1 projection, projections ...projection) SelectStatement {
return newSelectStatement(r.parent, append([]projection{projection1}, projections...))
}
// Creates a inner join tableName Expression using onCondition.
func (r *readableTableInterfaceImpl) INNER_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable {
return newJoinTable(r.parent, table, innerJoin, onCondition)
}
// Creates a left join tableName Expression using onCondition.
func (r *readableTableInterfaceImpl) LEFT_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable {
return newJoinTable(r.parent, table, leftJoin, onCondition)
}
// Creates a right join tableName Expression using onCondition.
func (r *readableTableInterfaceImpl) RIGHT_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable {
return newJoinTable(r.parent, table, rightJoin, onCondition)
}
func (r *readableTableInterfaceImpl) FULL_JOIN(table ReadableTable, onCondition BoolExpression) ReadableTable {
return newJoinTable(r.parent, table, fullJoin, onCondition)
}
func (r *readableTableInterfaceImpl) CROSS_JOIN(table ReadableTable) ReadableTable {
return newJoinTable(r.parent, table, crossJoin, nil)
}
type writableTableInterfaceImpl struct {
parent WritableTable
}
func (w *writableTableInterfaceImpl) INSERT(columns ...column) InsertStatement {
return newInsertStatement(w.parent, unwidColumnList(columns))
}
func (w *writableTableInterfaceImpl) UPDATE(column column, columns ...column) UpdateStatement {
return newUpdateStatement(w.parent, unwindColumns(column, columns...))
}
func (w *writableTableInterfaceImpl) DELETE() DeleteStatement {
return newDeleteStatement(w.parent)
}
func (w *writableTableInterfaceImpl) LOCK() LockStatement {
return LOCK(w.parent)
}
// NewTable creates new table with schema name, table name and list of columns
func NewTable(schemaName, name string, columns ...Column) Table {
t := &tableImpl{
schemaName: schemaName,
name: name,
columnList: columns,
}
for _, c := range columns {
c.setTableName(name)
}
t.readableTableInterfaceImpl.parent = t
t.writableTableInterfaceImpl.parent = t
return t
}
type tableImpl struct {
readableTableInterfaceImpl
writableTableInterfaceImpl
schemaName string
name string
alias string
columnList []Column
}
func (t *tableImpl) AS(alias string) {
t.alias = alias
for _, c := range t.columnList {
c.setTableName(alias)
}
}
func (t *tableImpl) SchemaName() string {
return t.schemaName
}
func (t *tableImpl) TableName() string {
return t.name
}
func (t *tableImpl) columns() []column {
ret := []column{}
for _, col := range t.columnList {
ret = append(ret, col)
}
return ret
}
func (t *tableImpl) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
if t == nil {
return errors.New("jet: tableImpl is nil. ")
}
out.writeIdentifier(t.schemaName)
out.writeString(".")
out.writeIdentifier(t.name)
if len(t.alias) > 0 {
out.writeString("AS")
out.writeIdentifier(t.alias)
}
return nil
}
type joinType int
const (
innerJoin joinType = iota
leftJoin
rightJoin
fullJoin
crossJoin
)
// Join expressions are pseudo readable tables.
type joinTable struct {
readableTableInterfaceImpl
lhs ReadableTable
rhs ReadableTable
joinType joinType
onCondition BoolExpression
}
func newJoinTable(
lhs ReadableTable,
rhs ReadableTable,
joinType joinType,
onCondition BoolExpression) ReadableTable {
joinTable := &joinTable{
lhs: lhs,
rhs: rhs,
joinType: joinType,
onCondition: onCondition,
}
joinTable.readableTableInterfaceImpl.parent = joinTable
return joinTable
}
func (t *joinTable) SchemaName() string {
return ""
}
func (t *joinTable) TableName() string {
return ""
}
func (t *joinTable) columns() []column {
return append(t.lhs.columns(), t.rhs.columns()...)
}
func (t *joinTable) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) (err error) {
if t == nil {
return errors.New("jet: Join table is nil. ")
}
if utils.IsNil(t.lhs) {
return errors.New("jet: left hand side of join operation is nil table")
}
if err = t.lhs.serialize(statement, out); err != nil {
return
}
out.newLine()
switch t.joinType {
case innerJoin:
out.writeString("INNER JOIN")
case leftJoin:
out.writeString("LEFT JOIN")
case rightJoin:
out.writeString("RIGHT JOIN")
case fullJoin:
out.writeString("FULL JOIN")
case crossJoin:
out.writeString("CROSS JOIN")
}
if utils.IsNil(t.rhs) {
return errors.New("jet: right hand side of join operation is nil table")
}
if err = t.rhs.serialize(statement, out); err != nil {
return
}
if t.onCondition == nil && t.joinType != crossJoin {
return errors.New("jet: join condition is nil")
}
if t.onCondition != nil {
out.writeString("ON")
if err = t.onCondition.serialize(statement, out); err != nil {
return
}
}
return nil
}
func unwindColumns(column1 column, columns ...column) []column {
columnList := []column{}
if val, ok := column1.(ColumnList); ok {
for _, col := range val {
columnList = append(columnList, col)
}
columnList = append(columnList, columns...)
} else {
columnList = append(columnList, column1)
columnList = append(columnList, columns...)
}
return columnList
}
func unwidColumnList(columns []column) []column {
ret := []column{}
for _, col := range columns {
if columnList, ok := col.(ColumnList); ok {
for _, c := range columnList {
ret = append(ret, c)
}
} else {
ret = append(ret, col)
}
}
return ret
}