gosora/query_gen/pgsql.go

509 lines
14 KiB
Go

/* WIP Under Really Heavy Construction */
package qgen
import (
"database/sql"
"errors"
"strconv"
"strings"
)
func init() {
Registry = append(Registry,
&PgsqlAdapter{Name: "pgsql", Buffer: make(map[string]DBStmt)},
)
}
type PgsqlAdapter struct {
Name string // ? - Do we really need this? Can't we hard-code this?
Buffer map[string]DBStmt
BufferOrder []string // Map iteration order is random, so we need this to track the order, so we don't get huge diffs every commit
}
// GetName gives you the name of the database adapter. In this case, it's pgsql
func (a *PgsqlAdapter) GetName() string {
return a.Name
}
func (a *PgsqlAdapter) GetStmt(name string) DBStmt {
return a.Buffer[name]
}
func (a *PgsqlAdapter) GetStmts() map[string]DBStmt {
return a.Buffer
}
// TODO: Implement this
func (a *PgsqlAdapter) BuildConn(config map[string]string) (*sql.DB, error) {
return nil, nil
}
func (a *PgsqlAdapter) DbVersion() string {
return "SELECT version()"
}
func (a *PgsqlAdapter) DropTable(name, table string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
q := "DROP TABLE IF EXISTS \"" + table + "\";"
a.pushStatement(name, "drop-table", q)
return q, nil
}
// TODO: Implement this
// We may need to change the CreateTable API to better suit PGSQL and the other database drivers which are coming up
func (a *PgsqlAdapter) CreateTable(name, table, charset, collation string, columns []DBTableColumn, keys []DBTableKey) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if len(columns) == 0 {
return "", errors.New("You can't have a table with no columns")
}
q := "CREATE TABLE \"" + table + "\" ("
for _, column := range columns {
if column.AutoIncrement {
column.Type = "serial"
} else if column.Type == "createdAt" {
column.Type = "timestamp"
} else if column.Type == "datetime" {
column.Type = "timestamp"
}
var size string
if column.Size > 0 {
size = " (" + strconv.Itoa(column.Size) + ")"
}
var end string
if column.Default != "" {
end = " DEFAULT "
if a.stringyType(column.Type) && column.Default != "''" {
end += "'" + column.Default + "'"
} else {
end += column.Default
}
}
if !column.Null {
end += " not null"
}
q += "\n\t`" + column.Name + "` " + column.Type + size + end + ","
}
if len(keys) > 0 {
for _, key := range keys {
q += "\n\t" + key.Type
if key.Type != "unique" {
q += " key"
}
q += "("
for _, column := range strings.Split(key.Columns, ",") {
q += "`" + column + "`,"
}
q = q[0:len(q)-1] + "),"
}
}
q = q[0:len(q)-1] + "\n);"
a.pushStatement(name, "create-table", q)
return q, nil
}
// TODO: Implement this
func (a *PgsqlAdapter) AddColumn(name, table string, column DBTableColumn, key *DBTableKey) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) DropColumn(name, table, colName string) (string, error) {
return "", errors.New("not implemented")
}
// TODO: Implement this
func (a *PgsqlAdapter) RenameColumn(name, table, oldName, newName string) (string, error) {
return "", errors.New("not implemented")
}
// TODO: Implement this
func (a *PgsqlAdapter) ChangeColumn(name, table, colName string, col DBTableColumn) (string, error) {
return "", errors.New("not implemented")
}
// TODO: Implement this
func (a *PgsqlAdapter) SetDefaultColumn(name, table, colName, colType, defaultStr string) (string, error) {
if colType == "text" {
return "", errors.New("text fields cannot have default values")
}
return "", errors.New("not implemented")
}
// TODO: Implement this
// TODO: Test to make sure everything works here
func (a *PgsqlAdapter) AddIndex(name, table, iname, colname string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if iname == "" {
return "", errors.New("You need a name for the index")
}
if colname == "" {
return "", errors.New("You need a name for the column")
}
return "", errors.New("not implemented")
}
// TODO: Implement this
// TODO: Test to make sure everything works here
func (a *PgsqlAdapter) AddKey(name, table, column string, key DBTableKey) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if column == "" {
return "", errors.New("You need a name for the column")
}
return "", errors.New("not implemented")
}
// TODO: Implement this
// TODO: Test to make sure everything works here
func (a *PgsqlAdapter) AddForeignKey(name, table, column, ftable, fcolumn string, cascade bool) (out string, e error) {
var c = func(str string, val bool) {
if e != nil || !val {
return
}
e = errors.New("You need a " + str + " for this table")
}
c("name", table == "")
c("column", column == "")
c("ftable", ftable == "")
c("fcolumn", fcolumn == "")
if e != nil {
return "", e
}
return "", errors.New("not implemented")
}
// TODO: Test this
// ! We need to get the last ID out of this somehow, maybe add returning to every query? Might require some sort of wrapper over the sql statements
func (a *PgsqlAdapter) SimpleInsert(name, table, columns, fields string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
q := "INSERT INTO \"" + table + "\"("
if columns != "" {
q += a.buildColumns(columns) + ") VALUES ("
for _, field := range processFields(fields) {
nameLen := len(field.Name)
if field.Name[0] == '"' && field.Name[nameLen-1] == '"' && nameLen >= 3 {
field.Name = "'" + field.Name[1:nameLen-1] + "'"
}
if field.Name[0] == '\'' && field.Name[nameLen-1] == '\'' && nameLen >= 3 {
field.Name = "'" + strings.Replace(field.Name[1:nameLen-1], "'", "''", -1) + "'"
}
q += field.Name + ","
}
q = q[0 : len(q)-1]
} else {
q += ") VALUES ("
}
q += ")"
a.pushStatement(name, "insert", q)
return q, nil
}
func (a *PgsqlAdapter) buildColumns(cols string) (q string) {
if cols == "" {
return ""
}
// Escape the column names, just in case we've used a reserved keyword
for _, col := range processColumns(cols) {
if col.Type == TokenFunc {
q += col.Left + ","
} else {
q += "\"" + col.Left + "\","
}
}
return q[0 : len(q)-1]
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleReplace(name, table, columns, fields string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if len(columns) == 0 {
return "", errors.New("No columns found for SimpleInsert")
}
if len(fields) == 0 {
return "", errors.New("No input data found for SimpleInsert")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleUpsert(name, table, columns, fields, where string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if len(columns) == 0 {
return "", errors.New("No columns found for SimpleInsert")
}
if len(fields) == 0 {
return "", errors.New("No input data found for SimpleInsert")
}
return "", nil
}
// TODO: Implemented, but we need CreateTable and a better installer to *test* it
func (a *PgsqlAdapter) SimpleUpdate(up *updatePrebuilder) (string, error) {
if up.table == "" {
return "", errors.New("You need a name for this table")
}
if up.set == "" {
return "", errors.New("You need to set data in this update statement")
}
q := "UPDATE \"" + up.table + "\" SET "
for _, item := range processSet(up.set) {
q += "`" + item.Column + "`="
for _, token := range item.Expr {
switch token.Type {
case TokenFunc:
// TODO: Write a more sophisticated function parser on the utils side.
if strings.ToUpper(token.Contents) == "UTC_TIMESTAMP()" {
token.Contents = "LOCALTIMESTAMP()"
}
q += " " + token.Contents
case TokenOp, TokenNumber, TokenSub, TokenOr:
q += " " + token.Contents
case TokenColumn:
q += " `" + token.Contents + "`"
case TokenString:
q += " '" + token.Contents + "'"
}
}
q += ","
}
q = q[0 : len(q)-1]
// Add support for BETWEEN x.x
if len(up.where) != 0 {
q += " WHERE"
for _, loc := range processWhere(up.where) {
for _, token := range loc.Expr {
switch token.Type {
case TokenFunc:
// TODO: Write a more sophisticated function parser on the utils side. What's the situation in regards to case sensitivity?
if strings.ToUpper(token.Contents) == "UTC_TIMESTAMP()" {
token.Contents = "LOCALTIMESTAMP()"
}
q += " " + token.Contents
case TokenOp, TokenNumber, TokenSub, TokenOr, TokenNot, TokenLike:
q += " " + token.Contents
case TokenColumn:
q += " `" + token.Contents + "`"
case TokenString:
q += " '" + token.Contents + "'"
default:
panic("This token doesn't exist o_o")
}
}
q += " AND"
}
q = q[0 : len(q)-4]
}
a.pushStatement(up.name, "update", q)
return q, nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleUpdateSelect(up *updatePrebuilder) (string, error) {
return "", errors.New("not implemented")
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleDelete(name, table, where string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if where == "" {
return "", errors.New("You need to specify what data you want to delete")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) ComplexDelete(b *deletePrebuilder) (string, error) {
if b.table == "" {
return "", errors.New("You need a name for this table")
}
if b.where == "" {
return "", errors.New("You need to specify what data you want to delete")
}
return "", nil
}
// TODO: Implement this
// We don't want to accidentally wipe tables, so we'll have a separate method for purging tables instead
func (a *PgsqlAdapter) Purge(name, table string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleSelect(name, table, columns, where, orderby, limit string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
if len(columns) == 0 {
return "", errors.New("No columns found for SimpleSelect")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) ComplexSelect(prebuilder *selectPrebuilder) (string, error) {
if prebuilder.table == "" {
return "", errors.New("You need a name for this table")
}
if len(prebuilder.columns) == 0 {
return "", errors.New("No columns found for ComplexSelect")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleLeftJoin(name, table1, table2, columns, joiners, where, orderby, limit string) (string, error) {
if table1 == "" {
return "", errors.New("You need a name for the left table")
}
if table2 == "" {
return "", errors.New("You need a name for the right table")
}
if len(columns) == 0 {
return "", errors.New("No columns found for SimpleLeftJoin")
}
if len(joiners) == 0 {
return "", errors.New("No joiners found for SimpleLeftJoin")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleInnerJoin(name, table1, table2, columns, joiners, where, orderby, limit string) (string, error) {
if table1 == "" {
return "", errors.New("You need a name for the left table")
}
if table2 == "" {
return "", errors.New("You need a name for the right table")
}
if len(columns) == 0 {
return "", errors.New("No columns found for SimpleInnerJoin")
}
if len(joiners) == 0 {
return "", errors.New("No joiners found for SimpleInnerJoin")
}
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleInsertSelect(name string, ins DBInsert, sel DBSelect) (string, error) {
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleInsertLeftJoin(name string, ins DBInsert, sel DBJoin) (string, error) {
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleInsertInnerJoin(name string, ins DBInsert, sel DBJoin) (string, error) {
return "", nil
}
// TODO: Implement this
func (a *PgsqlAdapter) SimpleCount(name, table, where, limit string) (string, error) {
if table == "" {
return "", errors.New("You need a name for this table")
}
return "", nil
}
func (a *PgsqlAdapter) Builder() *prebuilder {
return &prebuilder{a}
}
func (a *PgsqlAdapter) Write() error {
var stmts, body string
for _, name := range a.BufferOrder {
if name[0] == '_' {
continue
}
stmt := a.Buffer[name]
// TODO: Add support for create-table? Table creation might be a little complex for Go to do outside a SQL file :(
if stmt.Type != "create-table" {
stmts += "\t" + name + " *sql.Stmt\n"
body += `
common.DebugLog("Preparing ` + name + ` statement.")
stmts.` + name + `, err = db.Prepare("` + strings.Replace(stmt.Contents, "\"", "\\\"", -1) + `")
if err != nil {
log.Print("Error in ` + name + ` statement.")
return err
}
`
}
}
// TODO: Move these custom queries out of this file
out := `// +build pgsql
// This file was generated by Gosora's Query Generator. Please try to avoid modifying this file, as it might change at any time.
package main
import "log"
import "database/sql"
import "github.com/Azareal/Gosora/common"
// nolint
type Stmts struct {
` + stmts + `
getActivityFeedByWatcher *sql.Stmt
getActivityCountByWatcher *sql.Stmt
Mocks bool
}
// nolint
func _gen_pgsql() (err error) {
common.DebugLog("Building the generated statements")
` + body + `
return nil
}
`
return writeFile("./gen_pgsql.go", out)
}
// Internal methods, not exposed in the interface
func (a *PgsqlAdapter) pushStatement(name, stype, q string) {
if name == "" {
return
}
a.Buffer[name] = DBStmt{q, stype}
a.BufferOrder = append(a.BufferOrder, name)
}
func (a *PgsqlAdapter) stringyType(ctype string) bool {
ctype = strings.ToLower(ctype)
return ctype == "char" || ctype == "varchar" || ctype == "timestamp" || ctype == "text"
}