472 lines
13 KiB
Go
472 lines
13 KiB
Go
/* WIP Under Really Heavy Construction */
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package qgen
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import (
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"database/sql"
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"errors"
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"strconv"
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"strings"
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)
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func init() {
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Registry = append(Registry,
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&PgsqlAdapter{Name: "pgsql", Buffer: make(map[string]DBStmt)},
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)
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}
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type PgsqlAdapter struct {
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Name string // ? - Do we really need this? Can't we hard-code this?
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Buffer map[string]DBStmt
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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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// GetName gives you the name of the database adapter. In this case, it's pgsql
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func (adapter *PgsqlAdapter) GetName() string {
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return adapter.Name
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}
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func (adapter *PgsqlAdapter) GetStmt(name string) DBStmt {
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return adapter.Buffer[name]
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}
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func (adapter *PgsqlAdapter) GetStmts() map[string]DBStmt {
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return adapter.Buffer
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}
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// TODO: Implement this
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func (adapter *PgsqlAdapter) BuildConn(config map[string]string) (*sql.DB, error) {
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return nil, nil
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}
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func (adapter *PgsqlAdapter) DbVersion() string {
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return "SELECT version()"
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}
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func (adapter *PgsqlAdapter) DropTable(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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querystr := "DROP TABLE IF EXISTS \"" + table + "\";"
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adapter.pushStatement(name, "drop-table", querystr)
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return querystr, nil
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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 *PgsqlAdapter) CreateTable(name string, table string, charset string, collation string, columns []DBTableColumn, keys []DBTableKey) (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.AutoIncrement {
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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 *PgsqlAdapter) AddColumn(name string, table string, column DBTableColumn) (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: Test this
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// ! 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
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func (adapter *PgsqlAdapter) 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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var querystr = "INSERT INTO \"" + table + "\"("
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if columns != "" {
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querystr += adapter.buildColumns(columns) + ") VALUES ("
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for _, field := range processFields(fields) {
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nameLen := len(field.Name)
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if field.Name[0] == '"' && field.Name[nameLen-1] == '"' && nameLen >= 3 {
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field.Name = "'" + field.Name[1:nameLen-1] + "'"
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}
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if field.Name[0] == '\'' && field.Name[nameLen-1] == '\'' && nameLen >= 3 {
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field.Name = "'" + strings.Replace(field.Name[1:nameLen-1], "'", "''", -1) + "'"
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}
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querystr += field.Name + ","
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}
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querystr = querystr[0 : len(querystr)-1]
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} else {
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querystr += ") VALUES ("
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}
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querystr += ")"
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adapter.pushStatement(name, "insert", querystr)
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return querystr, nil
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}
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func (adapter *PgsqlAdapter) buildColumns(columns string) (querystr string) {
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if columns == "" {
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return ""
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}
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// Escape the column names, just in case we've used a reserved keyword
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for _, column := range processColumns(columns) {
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if column.Type == "function" {
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querystr += column.Left + ","
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} else {
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querystr += "\"" + column.Left + "\","
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}
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}
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return querystr[0 : len(querystr)-1]
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}
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// TODO: Implement this
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func (adapter *PgsqlAdapter) 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: Implement this
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func (adapter *PgsqlAdapter) SimpleUpsert(name string, table string, columns string, fields 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 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 *PgsqlAdapter) 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 processSet(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", "or":
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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", "or":
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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 *PgsqlAdapter) 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 separate method for purging tables instead
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func (adapter *PgsqlAdapter) 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 *PgsqlAdapter) 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 *PgsqlAdapter) ComplexSelect(prebuilder *selectPrebuilder) (string, error) {
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if prebuilder.name == "" {
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return "", errors.New("You need a name for this statement")
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}
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if prebuilder.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(prebuilder.columns) == 0 {
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return "", errors.New("No columns found for ComplexSelect")
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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 *PgsqlAdapter) 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 *PgsqlAdapter) 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 *PgsqlAdapter) SimpleInsertSelect(name string, ins DBInsert, sel DBSelect) (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 *PgsqlAdapter) SimpleInsertLeftJoin(name string, ins DBInsert, sel DBJoin) (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 *PgsqlAdapter) SimpleInsertInnerJoin(name string, ins DBInsert, sel DBJoin) (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 *PgsqlAdapter) 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 *PgsqlAdapter) Builder() *prebuilder {
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return &prebuilder{adapter}
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}
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func (adapter *PgsqlAdapter) Write() error {
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var stmts, body string
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for _, name := range adapter.BufferOrder {
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if name[0] == '_' {
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continue
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}
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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 += "\t" + name + " *sql.Stmt\n"
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body += `
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common.DebugLog("Preparing ` + name + ` statement.")
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stmts.` + name + `, err = db.Prepare("` + stmt.Contents + `")
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if err != nil {
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log.Print("Error in ` + name + ` statement.")
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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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// TODO: Move these custom queries out of this file
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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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import "./common"
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// nolint
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type Stmts struct {
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` + stmts + `
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getActivityFeedByWatcher *sql.Stmt
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getActivityCountByWatcher *sql.Stmt
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todaysPostCount *sql.Stmt
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todaysTopicCount *sql.Stmt
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todaysReportCount *sql.Stmt
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todaysNewUserCount *sql.Stmt
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Mocks bool
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}
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// nolint
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func _gen_pgsql() (err error) {
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common.DebugLog("Building the generated statements")
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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 *PgsqlAdapter) pushStatement(name string, stype string, querystr string) {
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if name[0] == '_' {
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return
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}
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adapter.Buffer[name] = DBStmt{querystr, stype}
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adapter.BufferOrder = append(adapter.BufferOrder, name)
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}
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func (adapter *PgsqlAdapter) 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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