352 lines
10 KiB
Go
352 lines
10 KiB
Go
/* WIP Under Really Heavy Construction */
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package qgen
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import "strings"
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import "strconv"
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import "errors"
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func init() {
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DB_Registry = append(DB_Registry,
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&Pgsql_Adapter{Name: "pgsql", Buffer: make(map[string]DB_Stmt)},
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)
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}
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type Pgsql_Adapter struct {
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Name string
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Buffer map[string]DB_Stmt
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BufferOrder []string // Map iteration order is random, so we need this to track the order, so we don't get huge diffs every commit
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}
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func (adapter *Pgsql_Adapter) GetName() string {
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return adapter.Name
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}
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func (adapter *Pgsql_Adapter) GetStmt(name string) DB_Stmt {
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return adapter.Buffer[name]
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}
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func (adapter *Pgsql_Adapter) GetStmts() map[string]DB_Stmt {
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return adapter.Buffer
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}
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// TODO: Implement this
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// We may need to change the CreateTable API to better suit PGSQL and the other database drivers which are coming up
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func (adapter *Pgsql_Adapter) CreateTable(name string, table string, charset string, collation string, columns []DB_Table_Column, keys []DB_Table_Key) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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if len(columns) == 0 {
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return "", errors.New("You can't have a table with no columns")
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}
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var querystr = "CREATE TABLE `" + table + "` ("
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for _, column := range columns {
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if column.Auto_Increment {
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column.Type = "serial"
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} else if column.Type == "createdAt" {
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column.Type = "timestamp"
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} else if column.Type == "datetime" {
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column.Type = "timestamp"
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}
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var size string
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if column.Size > 0 {
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size = " (" + strconv.Itoa(column.Size) + ")"
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}
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var end string
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if column.Default != "" {
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end = " DEFAULT "
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if adapter.stringyType(column.Type) && column.Default != "''" {
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end += "'" + column.Default + "'"
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} else {
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end += column.Default
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}
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}
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if !column.Null {
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end += " not null"
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}
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querystr += "\n\t`" + column.Name + "` " + column.Type + size + end + ","
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}
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if len(keys) > 0 {
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for _, key := range keys {
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querystr += "\n\t" + key.Type
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if key.Type != "unique" {
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querystr += " key"
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}
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querystr += "("
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for _, column := range strings.Split(key.Columns, ",") {
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querystr += "`" + column + "`,"
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}
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querystr = querystr[0:len(querystr)-1] + "),"
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}
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}
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querystr = querystr[0:len(querystr)-1] + "\n);"
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adapter.pushStatement(name, "create-table", querystr)
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return querystr, nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleInsert(name string, table string, columns string, fields string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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if len(columns) == 0 {
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return "", errors.New("No columns found for SimpleInsert")
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}
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if len(fields) == 0 {
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return "", errors.New("No input data found for SimpleInsert")
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}
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleReplace(name string, table string, columns string, fields string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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if len(columns) == 0 {
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return "", errors.New("No columns found for SimpleInsert")
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}
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if len(fields) == 0 {
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return "", errors.New("No input data found for SimpleInsert")
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}
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return "", nil
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}
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// TODO: Implemented, but we need CreateTable and a better installer to *test* it
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func (adapter *Pgsql_Adapter) SimpleUpdate(name string, table string, set string, where string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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if set == "" {
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return "", errors.New("You need to set data in this update statement")
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}
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var querystr = "UPDATE `" + table + "` SET "
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for _, item := range _process_set(set) {
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querystr += "`" + item.Column + "` ="
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for _, token := range item.Expr {
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switch token.Type {
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case "function":
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// TODO: Write a more sophisticated function parser on the utils side.
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if strings.ToUpper(token.Contents) == "UTC_TIMESTAMP()" {
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token.Contents = "LOCALTIMESTAMP()"
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}
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querystr += " " + token.Contents
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case "operator", "number", "substitute":
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querystr += " " + token.Contents
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case "column":
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querystr += " `" + token.Contents + "`"
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case "string":
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querystr += " '" + token.Contents + "'"
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}
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}
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querystr += ","
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}
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// Remove the trailing comma
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querystr = querystr[0 : len(querystr)-1]
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// Add support for BETWEEN x.x
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if len(where) != 0 {
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querystr += " WHERE"
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for _, loc := range _processWhere(where) {
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for _, token := range loc.Expr {
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switch token.Type {
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case "function":
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// TODO: Write a more sophisticated function parser on the utils side. What's the situation in regards to case sensitivity?
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if strings.ToUpper(token.Contents) == "UTC_TIMESTAMP()" {
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token.Contents = "LOCALTIMESTAMP()"
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}
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querystr += " " + token.Contents
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case "operator", "number", "substitute":
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querystr += " " + token.Contents
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case "column":
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querystr += " `" + token.Contents + "`"
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case "string":
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querystr += " '" + token.Contents + "'"
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default:
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panic("This token doesn't exist o_o")
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}
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}
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querystr += " AND"
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}
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querystr = querystr[0 : len(querystr)-4]
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}
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adapter.pushStatement(name, "update", querystr)
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return querystr, nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleDelete(name string, table string, where string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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if where == "" {
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return "", errors.New("You need to specify what data you want to delete")
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}
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return "", nil
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}
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// TODO: Implement this
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// We don't want to accidentally wipe tables, so we'll have a seperate method for purging tables instead
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func (adapter *Pgsql_Adapter) Purge(name string, table string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleSelect(name string, table string, columns string, where string, orderby string, limit string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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if len(columns) == 0 {
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return "", errors.New("No columns found for SimpleSelect")
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}
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleLeftJoin(name string, table1 string, table2 string, columns string, joiners string, where string, orderby string, limit string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table1 == "" {
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return "", errors.New("You need a name for the left table")
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}
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if table2 == "" {
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return "", errors.New("You need a name for the right table")
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}
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if len(columns) == 0 {
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return "", errors.New("No columns found for SimpleLeftJoin")
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}
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if len(joiners) == 0 {
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return "", errors.New("No joiners found for SimpleLeftJoin")
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}
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleInnerJoin(name string, table1 string, table2 string, columns string, joiners string, where string, orderby string, limit string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table1 == "" {
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return "", errors.New("You need a name for the left table")
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}
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if table2 == "" {
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return "", errors.New("You need a name for the right table")
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}
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if len(columns) == 0 {
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return "", errors.New("No columns found for SimpleInnerJoin")
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}
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if len(joiners) == 0 {
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return "", errors.New("No joiners found for SimpleInnerJoin")
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}
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleInsertSelect(name string, ins DB_Insert, sel DB_Select) (string, error) {
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleInsertLeftJoin(name string, ins DB_Insert, sel DB_Join) (string, error) {
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleInsertInnerJoin(name string, ins DB_Insert, sel DB_Join) (string, error) {
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return "", nil
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}
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// TODO: Implement this
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func (adapter *Pgsql_Adapter) SimpleCount(name string, table string, where string, limit string) (string, error) {
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if name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if table == "" {
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return "", errors.New("You need a name for this table")
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}
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return "", nil
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}
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func (adapter *Pgsql_Adapter) Write() error {
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var stmts, body string
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for _, name := range adapter.BufferOrder {
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stmt := adapter.Buffer[name]
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// TODO: Add support for create-table? Table creation might be a little complex for Go to do outside a SQL file :(
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if stmt.Type != "create-table" {
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stmts += "var " + name + "_stmt *sql.Stmt\n"
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body += `
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log.Print("Preparing ` + name + ` statement.")
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` + name + `_stmt, err = db.Prepare("` + stmt.Contents + `")
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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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}
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}
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out := `// +build pgsql
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// This file was generated by Gosora's Query Generator. Please try to avoid modifying this file, as it might change at any time.
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package main
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import "log"
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import "database/sql"
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// nolint
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` + stmts + `
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// nolint
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func _gen_pgsql() (err error) {
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if dev.DebugMode {
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log.Print("Building the generated statements")
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}
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` + body + `
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return nil
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}
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`
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return writeFile("./gen_pgsql.go", out)
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}
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// Internal methods, not exposed in the interface
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func (adapter *Pgsql_Adapter) pushStatement(name string, stype string, querystr string) {
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adapter.Buffer[name] = DB_Stmt{querystr, stype}
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adapter.BufferOrder = append(adapter.BufferOrder, name)
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}
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func (adapter *Pgsql_Adapter) stringyType(ctype string) bool {
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ctype = strings.ToLower(ctype)
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return ctype == "char" || ctype == "varchar" || ctype == "timestamp" || ctype == "text"
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}
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