derived table and row number addition

Makefile

@@ -1,4 +1,9 @@
+.PHONY: run bench-select test
+
 run:
-	go run ./cmd -o ./example/db ./example/schema.sql
+	go run ./cmd -o ./playground/db ./playground/schema.sql
 bench-select:
 	go test ./example -bench BenchmarkSelect -memprofile memprofile.out -cpuprofile profile.out
+
+test:
+	go test ./playground

README.md

@@ -1,74 +1,81 @@
-# pgm - PostgreSQL query mapper
-A simple ORM that will work on top of [jackc/pgx](https://github.com/jackc/pgx) db connection pool.
+# pgm - PostgreSQL Query Mapper
 
+A lightweight ORM built on top of [jackc/pgx](https://github.com/jackc/pgx) database connection pool.
 
-## ORMs in go eco system tha I like
- - [ent](https://github.com/ent/ent)
- - [sqlc](https://github.com/sqlc-dev/sqlc)
+## ORMs I Like in the Go Ecosystem
 
-## Why not to use ent?
-ent is feature loadedm, you can easily define complex schemas, it has nice integration with graphQL.
-Very nice auto migration feature. Basically all the things you need in an ORM.
+- [ent](https://github.com/ent/ent)
+- [sqlc](https://github.com/sqlc-dev/sqlc)
 
-But to me its overkill for simple apps, I have seen ent related code is taking significatn space in app binary(feels bloated).
+## Why Not Use `ent`?
 
+`ent` is a feature-rich ORM with schema definition, automatic migrations, integration with `gqlgen` (GraphQL server), and more. It provides nearly everything you could want in an ORM.
 
-## Why not to use sqlc?
-sqlc is nice as well, but using it will start feeling that now your DB layer has its own Models and you need map you apps model with it or have no choice but to sart using DB layer models, which to me is not a good thing.
+However, it can be overkill. The generated code supports a wide range of features, many of which you may not use, significantly increasing the compiled binary size.
 
-## Things that I am not happy with
+## Why Not Use `sqlc`?
 
-  - Auto migrations, at many points you will see ORM is either not providing or have a complex way to do the simple db schema related changes. Its like obscure db schema. you can simply tell and test it in sql query editor.
+`sqlc` is a great tool, but it often feels like the database layer introduces its own models. This forces you to either map your application’s models to these database models or use the database models directly, which may not align with your application’s design.
 
-  DB must be a in form sql statement that you see, fine tune and event run/test in sql query editor.
-  Thers is lots of mature tools available in Go ecosystem, [dbmate](https://github.com/amacneil/dbmate) is one of them, its a nice tool to manage migrations, can be use in code or in cli
+## Issues with Existing ORMs
 
-  - To much extra code is generated for various condition and scenarios that you may not use
+Here are some common pain points with ORMs:
 
-  - Auto genearted models for select queries that will now force you to either use them or to map them to required model.
+- **Auto Migrations**: Many ORMs either lack robust migration support or implement complex methods for simple schema changes. This can obscure the database schema, making it harder to understand and maintain. A database schema should be defined in clear SQL statements that can be tested in a SQL query editor. Tools like [dbmate](https://github.com/amacneil/dbmate) provide a mature solution for managing migrations, usable via CLI or in code.
 
-## Okay, what to do now, plain old sql queries?
-Yes and No may hybrid. Plain old sql queries are not bad, just have have few concerns
+- **Excessive Code Generation**: ORMs often generate excessive code for various conditions and scenarios, much of which goes unused.
 
-- Change in schema are not detected well.
-- Sql in jection issue if not using parameterized queries.
+- **Generated Models for Queries**: Auto-generated models for `SELECT` queries force you to either adopt them or map them to your application’s models, adding complexity.
 
-We can address these issues using pgm, pgm cli will help to cream light weight DB schema go files that will help in writing sql queries this can help keeping eye on schema changes, goal is not to hard code table and table.column names
+## A Hybrid Approach: Plain SQL Queries with `pgm`
+
+Plain SQL queries are not inherently bad but come with challenges:
+
+- **Schema Change Detection**: Changes in the database schema are not easily detected.
+- **SQL Injection Risks**: Without parameterized queries, SQL injection becomes a concern.
+
+`pgm` addresses these issues by providing a lightweight CLI tool that generates Go files for your database schema. These files help you write SQL queries while keeping track of schema changes, avoiding hardcoded table and column names.
+
+## Generating `pgm` Schema Files
+
+Run the following command to generate schema files:
 
-## Generate pgm schema files
-run following command to generate pgm schema files
 ```bash
-go run code.patial.tech/go/pgm/cmd -o ./db ./schema.sql
+go run code.partial.tech/go/pgm/cmd -o ./db ./schema.sql
 ```
-It will create bunch of files and filders under `./db` directory
-
+once you have the schama files created you can use `pgm` as 
 
 ```go
 package main
-import "code.patial.tech/go/pgm"
+
+import (
+    "code.partial.tech/go/pgm"
+    "myapp/db/user" // scham  create by pgm/cmd
+)
 
 type MyModel struct {
-	ID string
-	Email string
+    ID    string
+    Email string
 }
 
 func main() {
-	println("init pgx connection pool")
-	pgm.InitPool(pgm.Config{
-		ConnString: url,
-	})
+    println("Initializing pgx connection pool")
+    pgm.InitPool(pgm.Config{
+        ConnString: url,
+    })
 
-	// Select query with first record to scan
-	// it is assuming that schema is already created and is in "db" package and has User table init
-	var v MyModel
-	err := db.User.Select(user.ID, user.Email).
-		Where(user.Email.Like("anki%")).
-		First(context.TODO(), &v.Email, &v.ID)
-	if err != nil {
-		println("error, ", err.Error())
-		return
-	}
+    // Select query to fetch the first record
+    // Assumes the schema is defined in the "db" package with a User table
+    var v MyModel
+    err := db.User.Select(user.ID, user.Email).
+        Where(user.Email.Like("anki%")).
+        First(context.TODO(), &v.ID, &v.Email)
+    if err != nil {
+        println("Error:", err.Error())
+        return
+    }
 
-	println("user email", v.Email)
+    println("User email:", v.Email)
 }
 ```
+

cmd/generate.go

@@ -95,6 +95,8 @@ func writeColFile(tblName string, cols []*Column, outDir string, caser cases.Cas
 	sb.WriteString(fmt.Sprintf("package %s\n\n", filepath.Base(outDir)))
 	sb.WriteString(fmt.Sprintf("import %q\n\n", "code.patial.tech/go/pgm"))
 	sb.WriteString("const (")
+	sb.WriteString("\n // All fields in table " + tblName)
+	sb.WriteString(fmt.Sprintf("\n All pgm.Field = %q", tblName+".*"))
 	var name string
 	for _, c := range cols {
 		name = strings.ReplaceAll(c.Name, "_", " ")

pgm.go

@@ -1,112 +1,103 @@
-// Patial Tech.
-// Author, Ankit Patial
+// pgm
+//
+// A simple PG string query builder
+//
+// Author: Ankit Patial
 
 package pgm
 
 import (
+	"context"
 	"errors"
-	"strings"
+	"log/slog"
+	"sync/atomic"
 	"time"
 
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgtype"
+	"github.com/jackc/pgx/v5/pgxpool"
 )
 
-// Table in database
-type Table struct {
-	Name       string
-	PK         []string
-	FieldCount uint16
-	debug      bool
+var (
+	poolPGX              atomic.Pointer[pgxpool.Pool]
+	ErrConnStringMissing = errors.New("connection string is empty")
+)
+
+// Errors
+var (
+	ErrInitTX   = errors.New("failed to init db.tx")
+	ErrCommitTX = errors.New("failed to commit db.tx")
+	ErrNoRows   = errors.New("no data found")
+)
+
+type Config struct {
+	ConnString      string
+	MaxConns        int32
+	MinConns        int32
+	MaxConnLifetime time.Duration
+	MaxConnIdleTime time.Duration
 }
 
-// Debug when set true will print generated query string in stdout
-func (t Table) Debug() Clause {
-	t.debug = true
-	return t
+// InitPool will create new pgxpool.Pool and will keep it for its working
+func InitPool(conf Config) {
+	if conf.ConnString == "" {
+		panic(ErrConnStringMissing)
+	}
+
+	cfg, err := pgxpool.ParseConfig(conf.ConnString)
+	if err != nil {
+		panic(err)
+	}
+
+	if conf.MaxConns > 0 {
+		cfg.MaxConns = conf.MaxConns // 100
+	}
+
+	if conf.MinConns > 0 {
+		cfg.MinConns = conf.MaxConns // 5
+	}
+
+	if conf.MaxConnLifetime > 0 {
+		cfg.MaxConnLifetime = conf.MaxConnLifetime // time.Minute * 10
+	}
+
+	if conf.MaxConnIdleTime > 0 {
+		cfg.MaxConnIdleTime = conf.MaxConnIdleTime // time.Minute * 5
+	}
+
+	p, err := pgxpool.NewWithConfig(context.Background(), cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = p.Ping(context.Background()); err != nil {
+		panic(err)
+	}
+
+	poolPGX.Store(p)
 }
 
-//
-//  Field ==>
-//
-
-// Field related to a table
-type Field string
-
-func (f Field) Name() string {
-	return strings.Split(string(f), ".")[1]
+// GetPool instance
+func GetPool() *pgxpool.Pool {
+	return poolPGX.Load()
 }
 
-func (f Field) String() string {
-	return string(f)
+// BeginTx begins a pgx poll transaction
+func BeginTx(ctx context.Context) (pgx.Tx, error) {
+	tx, err := poolPGX.Load().Begin(ctx)
+	if err != nil {
+		slog.Error(err.Error())
+		return nil, errors.New("failed to open db tx")
+	}
+
+	return tx, err
 }
 
-// Count fn wrapping of field
-func (f Field) Count() Field {
-	return Field("COUNT(" + f.String() + ")")
+// IsNotFound error check
+func IsNotFound(err error) bool {
+	return errors.Is(err, pgx.ErrNoRows)
 }
 
-// Avg fn wrapping of field
-func (f Field) Avg() Field {
-	return Field("AVG(" + f.String() + ")")
-}
-
-func (f Field) Eq(val any) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " = $", len: len(col) + 5}
-}
-
-// EqualFold will user LOWER() for comparision
-func (f Field) EqFold(val any) Conditioner {
-	col := f.String()
-	return &Cond{Field: "LOWER(" + col + ")", Val: val, op: " = LOWER($", action: CondActionNeedToClose, len: len(col) + 5}
-}
-
-func (f Field) NEq(val any) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " != $", len: len(col) + 5}
-}
-
-func (f Field) Gt(val any) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " > $", len: len(col) + 5}
-}
-
-func (f Field) Gte(val any) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " >= $", len: len(col) + 5}
-}
-
-func (f Field) Like(val string) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " LIKE $", len: len(f.String()) + 5}
-}
-
-func (f Field) LikeFold(val string) Conditioner {
-	col := f.String()
-	return &Cond{Field: "LOWER(" + col + ")", Val: val, op: " LIKE LOWER($", action: CondActionNeedToClose, len: len(col) + 5}
-}
-
-// ILIKE is case-insensitive
-func (f Field) ILike(val string) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " ILIKE $", len: len(col) + 5}
-}
-
-func (f Field) NotIn(val ...any) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: val, op: " NOT IN($", action: CondActionNeedToClose, len: len(col) + 5}
-}
-
-func (f Field) NotInSubQuery(qry WhereClause) Conditioner {
-	col := f.String()
-	return &Cond{Field: col, Val: qry, op: " NOT IN($)", action: CondActionSubQuery}
-}
-
-//
-//  Helper func ==>
-//
-
 // PgTime as in UTC
 func PgTime(t time.Time) pgtype.Timestamptz {
 	return pgtype.Timestamptz{Time: t, Valid: true}
@@ -115,20 +106,3 @@ func PgTime(t time.Time) pgtype.Timestamptz {
 func PgTimeNow() pgtype.Timestamptz {
 	return pgtype.Timestamptz{Time: time.Now(), Valid: true}
 }
-
-// IsNotFound error check
-func IsNotFound(err error) bool {
-	return errors.Is(err, pgx.ErrNoRows)
-}
-
-func ConcatWs(sep string, fields ...Field) string {
-	return "concat_ws('" + sep + "'," + joinFileds(fields) + ")"
-}
-
-func StringAgg(exp, sep string) string {
-	return "string_agg(" + exp + ",'" + sep + "')"
-}
-
-func StringAggCast(exp, sep string) string {
-	return "string_agg(cast(" + exp + " as varchar),'" + sep + "')"
-}

pgm_field.go

@@ -0,0 +1,228 @@
+package pgm
+
+import "strings"
+
+// Field related to a table
+type Field string
+
+func (f Field) Name() string {
+	return strings.Split(string(f), ".")[1]
+}
+
+func (f Field) String() string {
+	return string(f)
+}
+
+// Count function wrapped field
+func (f Field) Count() Field {
+	return Field("COUNT(" + f.String() + ")")
+}
+
+// StringEscape will wrap field with:
+//
+// COALESCE(field, ”)
+func (f Field) StringEscape() Field {
+	return Field("COALESCE(" + f.String() + ", '')")
+}
+
+// NumberEscape will wrap field with:
+//
+// COALESCE(field, 0)
+func (f Field) NumberEscape() Field {
+	return Field("COALESCE(" + f.String() + ", 0)")
+}
+
+// BooleanEscape will wrap field with:
+//
+// COALESCE(field, FALSE)
+func (f Field) BooleanEscape() Field {
+	return Field("COALESCE(" + f.String() + ", FALSE)")
+}
+
+// Avg function wrapped field
+func (f Field) Avg() Field {
+	return Field("AVG(" + f.String() + ")")
+}
+
+// Sum function wrapped field
+func (f Field) Sum() Field {
+	return Field("SUM(" + f.String() + ")")
+}
+
+// Max function wrapped field
+func (f Field) Max() Field {
+	return Field("MAX(" + f.String() + ")")
+}
+
+// Min function wrapped field
+func (f Field) Min() Field {
+	return Field("Min(" + f.String() + ")")
+}
+
+// Lower function wrapped field
+func (f Field) Lower() Field {
+	return Field("LOWER(" + f.String() + ")")
+}
+
+// Upper function wrapped field
+func (f Field) Upper() Field {
+	return Field("UPPER(" + f.String() + ")")
+}
+
+// Trim function wrapped field
+func (f Field) Trim() Field {
+	return Field("TRIM(" + f.String() + ")")
+}
+
+// Asc suffixed field, supposed to be used with order by
+func (f Field) Asc() Field {
+	return Field(f.String() + " ASC")
+}
+
+// Desc suffixed field, supposed to be used with order by
+func (f Field) Desc() Field {
+	return Field(f.String() + " DESC")
+}
+
+func (f Field) RowNumber(as string) Field {
+	return rowNumber(&f, nil, true, as)
+}
+
+func (f Field) RowNumberDesc(as string) Field {
+	return rowNumber(&f, nil, true, as)
+}
+
+// RowNumberPartionBy in ascending order
+func (f Field) RowNumberPartionBy(partition Field, as string) Field {
+	return rowNumber(&f, &partition, true, as)
+}
+
+func (f Field) RowNumberDescPartionBy(partition Field, as string) Field {
+	return rowNumber(&f, &partition, false, as)
+}
+
+func rowNumber(f, partition *Field, isAsc bool, as string) Field {
+	var orderBy string
+	if isAsc {
+		orderBy = " ASC"
+	} else {
+		orderBy = " DESC"
+	}
+
+	if as == "" {
+		as = "row_number"
+	}
+
+	col := f.String()
+	if partition != nil {
+		return Field("ROW_NUMBER() OVER (PARTITION BY " + partition.String() + " ORDER BY " + col + orderBy + ") AS " + as)
+	}
+
+	return Field("ROW_NUMBER() OVER (ORDER BY " + col + orderBy + ") AS " + as)
+}
+
+func (f Field) IsNull() Conditioner {
+	col := f.String()
+	return &Cond{Field: col, op: " IS NULL", len: len(col) + 8}
+}
+
+func (f Field) IsNotNull() Conditioner {
+	col := f.String()
+	return &Cond{Field: col, op: " IS NOT NULL", len: len(col) + 12}
+}
+
+// EqualFold will use LOWER(column_name) = LOWER(val) for comparision
+func (f Field) EqFold(val string) Conditioner {
+	col := f.String()
+	return &Cond{Field: "LOWER(" + col + ")", Val: val, op: " = LOWER($", action: CondActionNeedToClose, len: len(col) + 5}
+}
+
+// Eq is equal
+func (f Field) Eq(val any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " = $", len: len(col) + 5}
+}
+
+func (f Field) NotEq(val any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " != $", len: len(col) + 5}
+}
+
+func (f Field) Gt(val any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " > $", len: len(col) + 5}
+}
+
+func (f Field) Lt(val any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " < $", len: len(col) + 5}
+}
+
+func (f Field) Gte(val any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " >= $", len: len(col) + 5}
+}
+
+func (f Field) Lte(val any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " <= $", len: len(col) + 5}
+}
+
+func (f Field) Like(val string) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " LIKE $", len: len(f.String()) + 5}
+}
+
+func (f Field) LikeFold(val string) Conditioner {
+	col := f.String()
+	return &Cond{Field: "LOWER(" + col + ")", Val: val, op: " LIKE LOWER($", action: CondActionNeedToClose, len: len(col) + 5}
+}
+
+// ILIKE is case-insensitive
+func (f Field) ILike(val string) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " ILIKE $", len: len(col) + 5}
+}
+
+func (f Field) Any(val ...any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " = ANY($", action: CondActionNeedToClose, len: len(col) + 5}
+}
+
+func (f Field) NotAny(val ...any) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: val, op: " != ANY($", action: CondActionNeedToClose, len: len(col) + 5}
+}
+
+// NotInSubQuery using ANY
+func (f Field) NotInSubQuery(qry WhereClause) Conditioner {
+	col := f.String()
+	return &Cond{Field: col, Val: qry, op: " != ANY($)", action: CondActionSubQuery}
+}
+
+func ConcatWs(sep string, fields ...Field) Field {
+	return Field("concat_ws('" + sep + "'," + joinFileds(fields) + ")")
+}
+
+func StringAgg(exp, sep string) Field {
+	return Field("string_agg(" + exp + ",'" + sep + "')")
+}
+
+func StringAggCast(exp, sep string) Field {
+	return Field("string_agg(cast(" + exp + " as varchar),'" + sep + "')")
+}
+
+func joinFileds(fields []Field) string {
+	sb := getSB()
+	defer putSB(sb)
+	for i, f := range fields {
+		if i == 0 {
+			sb.WriteString(f.String())
+		} else {
+			sb.WriteString(", ")
+			sb.WriteString(f.String())
+		}
+	}
+
+	return sb.String()
+}

pgm_table.go

@@ -0,0 +1,71 @@
+package pgm
+
+// Table in database
+type Table struct {
+	Name         string
+	DerivedTable Query
+	PK           []string
+	FieldCount   uint16
+	debug        bool
+}
+
+// Debug when set true will print generated query string in stdout
+func (t *Table) Debug() Clause {
+	t.debug = true
+	return t
+}
+
+func (t *Table) Field(f string) Field {
+	return Field(t.Name + "." + f)
+}
+
+// Insert table statement
+func (t *Table) Insert() InsertClause {
+	qb := &insertQry{
+		debug:  t.debug,
+		table:  t.Name,
+		fields: make([]string, 0, t.FieldCount),
+		vals:   make([]string, 0, t.FieldCount),
+		args:   make([]any, 0, t.FieldCount),
+	}
+	return qb
+}
+
+// Select table statement
+func (t *Table) Select(field ...Field) SelectClause {
+	qb := &selectQry{
+		debug:  t.debug,
+		fields: field,
+	}
+
+	if t.DerivedTable != nil {
+		tName, args := t.DerivedTable.Build(true)
+		qb.table = "(" + tName + ") AS " + t.Name
+		qb.args = args
+	} else {
+		qb.table = t.Name
+	}
+
+	return qb
+}
+
+// Update table statement
+func (t *Table) Update() UpdateClause {
+	qb := &updateQry{
+		debug: t.debug,
+		table: t.Name,
+		cols:  make([]string, 0, t.FieldCount),
+		args:  make([]any, 0, t.FieldCount),
+	}
+	return qb
+}
+
+// Detlete table statement
+func (t *Table) Delete() DeleteCluase {
+	qb := &deleteQry{
+		debug: t.debug,
+		table: t.Name,
+	}
+
+	return qb
+}

playground/db/branchuser/branch_users.go

@@ -1,10 +1,12 @@
-// Code generated by db-gen. DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package branchuser
 
 import "code.patial.tech/go/pgm"
 
 const (
+	// All fields in table branch_users
+	All pgm.Field = "branch_users.*"
 	// BranchID field has db type "bigint NOT NULL"
 	BranchID pgm.Field = "branch_users.branch_id"
 	// UserID field has db type "bigint NOT NULL"

playground/db/comment/comments.go

@@ -1,10 +1,12 @@
-// Code generated by db-gen. DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package comment
 
 import "code.patial.tech/go/pgm"
 
 const (
+	// All fields in table comments
+	All pgm.Field = "comments.*"
 	// ID field has db type "integer NOT NULL"
 	ID pgm.Field = "comments.id"
 	// PostID field has db type "integer NOT NULL"

playground/db/derived.go

@@ -0,0 +1,11 @@
+package db
+
+import "code.patial.tech/go/pgm"
+
+func DerivedTable(tblName string, fromQry pgm.Query) pgm.Table {
+	t := pgm.Table{
+		Name:         tblName,
+		DerivedTable: fromQry,
+	}
+	return t
+}

playground/db/employee/employees.go

@@ -1,10 +1,12 @@
-// Code generated by db-gen. DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package employee
 
 import "code.patial.tech/go/pgm"
 
 const (
+	// All fields in table employees
+	All pgm.Field = "employees.*"
 	// ID field has db type "integer NOT NULL"
 	ID pgm.Field = "employees.id"
 	// Name field has db type "var NOT NULL"

playground/db/post/posts.go

@@ -1,10 +1,12 @@
-// Code generated by db-gen. DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package post
 
 import "code.patial.tech/go/pgm"
 
 const (
+	// All fields in table posts
+	All pgm.Field = "posts.*"
 	// ID field has db type "integer NOT NULL"
 	ID pgm.Field = "posts.id"
 	// UserID field has db type "integer NOT NULL"

playground/db/schema.go

@@ -1,5 +1,4 @@
-// Code generated by code.patial.tech/go/pgm/cmd
-// DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package db
 

playground/db/user/users.go

@@ -1,10 +1,12 @@
-// Code generated by db-gen. DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package user
 
 import "code.patial.tech/go/pgm"
 
 const (
+	// All fields in table users
+	All pgm.Field = "users.*"
 	// ID field has db type "integer NOT NULL"
 	ID pgm.Field = "users.id"
 	// Name field has db type "character varying(255) NOT NULL"

playground/db/usersession/user_sessions.go

@@ -1,10 +1,12 @@
-// Code generated by db-gen. DO NOT EDIT.
+// Code generated by code.patial.tech/go/pgm/cmd DO NOT EDIT.
 
 package usersession
 
 import "code.patial.tech/go/pgm"
 
 const (
+	// All fields in table user_sessions
+	All pgm.Field = "user_sessions.*"
 	// ID field has db type "character varying NOT NULL"
 	ID pgm.Field = "user_sessions.id"
 	// CreatedAt field has db type "timestamp with time zone DEFAULT CURRENT_TIMESTAMP NOT NULL"

playground/qry_delete_test.go

@@ -8,9 +8,9 @@ import (
 )
 
 func TestDelete(t *testing.T) {
-	expected := "DELETE FROM users WHERE users.id = $1 AND users.status_id NOT IN($2)"
+	expected := "DELETE FROM users WHERE users.id = $1 AND users.status_id != ANY($2)"
 	got := db.User.Delete().
-		Where(user.ID.Eq(1), user.StatusID.NotIn(1, 2, 3)).
+		Where(user.ID.Eq(1), user.StatusID.NotAny(1, 2, 3)).
 		String()
 	if got != expected {
 		t.Errorf("got %q, want %q", got, expected)

playground/qry_insert_test.go

@@ -23,23 +23,6 @@ func TestInsertQuery(t *testing.T) {
 	}
 }
 
-func TestInsertSetMap(t *testing.T) {
-	got := db.User.Insert().
-		SetMap(map[pgm.Field]any{
-			user.Email:     "aa@aa.com",
-			user.Phone:     8889991234,
-			user.FirstName: "fname",
-			user.LastName:  "lname",
-		}).
-		Returning(user.ID).
-		String()
-
-	expected := "INSERT INTO users(email, phone, first_name, last_name) VALUES($1, $2, $3, $4) RETURNING id"
-	if got != expected {
-		t.Errorf("\nexpected: %q\ngot: %q", expected, got)
-	}
-}
-
 func TestInsertQuery2(t *testing.T) {
 	got := db.User.Insert().
 		Set(user.Email, "aa@aa.com").
@@ -53,7 +36,7 @@ func TestInsertQuery2(t *testing.T) {
 	}
 }
 
-// BenchmarkInsertQuery-12    	 1952412	       605.3 ns/op	    1144 B/op	      18 allocs/op
+// BenchmarkInsertQuery-12    	 2014519	       584.0 ns/op	    1144 B/op	      18 allocs/op
 func BenchmarkInsertQuery(b *testing.B) {
 	for b.Loop() {
 		_ = db.User.Insert().

playground/qry_select_test.go

@@ -28,8 +28,9 @@ func TestQryBuilder2(t *testing.T) {
 			),
 		).
 		Where(
-			user.LastName.NEq(7),
+			user.LastName.NotEq(7),
 			user.Phone.Like("%123%"),
+			user.UpdatedAt.IsNotNull(),
 			user.Email.NotInSubQuery(db.User.Select(user.ID).Where(user.ID.Eq(123))),
 		).
 		Limit(10).
@@ -39,7 +40,7 @@ func TestQryBuilder2(t *testing.T) {
 	expected := "SELECT users.email, users.first_name FROM users JOIN user_sessions ON users.id = user_sessions.user_id" +
 		" JOIN branch_users ON users.id = branch_users.user_id WHERE users.id = $1 AND (users.status_id = $2 OR users.updated_at = $3)" +
 		" AND users.mfa_kind = $4 AND (users.first_name = $5 OR users.middle_name = $6) AND users.last_name != $7 AND users.phone" +
-		" LIKE $8 AND users.email NOT IN(SELECT users.id FROM users WHERE users.id = $9) LIMIT 10 OFFSET 100"
+		" LIKE $8 AND users.updated_at IS NOT NULL AND users.email != ANY(SELECT users.id FROM users WHERE users.id = $9) LIMIT 10 OFFSET 100"
 	if expected != got {
 		t.Errorf("\nexpected: %q\ngot: %q", expected, got)
 	}
@@ -59,7 +60,52 @@ func TestSelectWithHaving(t *testing.T) {
 	}
 }
 
-// BenchmarkSelect-12    	  668817	      1753 ns/op	    4442 B/op	      59 allocs/op
+func TestSelectDerived(t *testing.T) {
+	expected := "SELECT t.* FROM (SELECT users.*, ROW_NUMBER() OVER (PARTITION BY users.status_id ORDER BY users.created_at DESC) AS rn" +
+		" FROM users WHERE users.status_id = $1) AS t WHERE t.rn <= $2" +
+		" ORDER BY t.status_id, t.created_at DESC"
+
+	qry := db.User.
+		Select(user.All, user.CreatedAt.RowNumberDescPartionBy(user.StatusID, "rn")).
+		Where(user.StatusID.Eq(1))
+
+	tbl := db.DerivedTable("t", qry)
+	got := tbl.
+		Select(tbl.Field("*")).
+		Where(tbl.Field("rn").Lte(5)).
+		OrderBy(tbl.Field("status_id"), tbl.Field("created_at").Desc()).
+		String()
+
+	if expected != got {
+		t.Errorf("\nexpected: %q\n\ngot:      %q", expected, got)
+	}
+}
+
+func TestSelectWithJoin(t *testing.T) {
+	got := db.User.Select(user.Email, user.FirstName).
+		Join(db.UserSession, user.ID, usersession.UserID).
+		LeftJoin(db.BranchUser, user.ID, branchuser.UserID, pgm.Or(branchuser.RoleID.Eq("1"), branchuser.RoleID.Eq("2"))).
+		Where(
+			user.ID.Eq(3),
+			pgm.Or(
+				user.StatusID.Eq(4),
+				user.UpdatedAt.Eq(5),
+			),
+		).
+		Limit(10).
+		Offset(100).
+		String()
+
+	expected := "SELECT users.email, users.first_name " +
+		"FROM users JOIN user_sessions ON users.id = user_sessions.user_id " +
+		"LEFT JOIN branch_users ON users.id = branch_users.user_id AND (branch_users.role_id = $1 OR branch_users.role_id = $2) " +
+		"WHERE users.id = $3 AND (users.status_id = $4 OR users.updated_at = $5) " +
+		"LIMIT 10 OFFSET 100"
+	if expected != got {
+		t.Errorf("\nexpected: %q\ngot: %q", expected, got)
+	}
+}
+
 // BenchmarkSelect-12    	  638901	      1860 ns/op	    4266 B/op	      61 allocs/op
 func BenchmarkSelect(b *testing.B) {
 	for b.Loop() {
@@ -79,7 +125,7 @@ func BenchmarkSelect(b *testing.B) {
 				),
 			).
 			Where(
-				user.LastName.NEq(7),
+				user.LastName.NotEq(7),
 				user.Phone.Like("%123%"),
 				user.Email.NotInSubQuery(db.User.Select(user.ID).Where(user.ID.Eq(123))),
 			).

playground/qry_update_test.go

@@ -3,7 +3,6 @@ package playground
 import (
 	"testing"
 
-	"code.patial.tech/go/pgm"
 	"code.patial.tech/go/pgm/playground/db"
 	"code.patial.tech/go/pgm/playground/db/user"
 )
@@ -17,28 +16,7 @@ func TestUpdateQuery(t *testing.T) {
 			user.Email.Eq("aa@aa.com"),
 		).
 		Where(
-			user.StatusID.NEq(1),
-		).
-		String()
-
-	expected := "UPDATE users SET first_name=$1, middle_name=$2, last_name=$3 WHERE users.email = $4 AND users.status_id != $5"
-	if got != expected {
-		t.Errorf("\nexpected: %q\ngot: %q", expected, got)
-	}
-}
-
-func TestUpdateSetMap(t *testing.T) {
-	got := db.User.Update().
-		SetMap(map[pgm.Field]any{
-			user.FirstName:  "ankit",
-			user.MiddleName: "singh",
-			user.LastName:   "patial",
-		}).
-		Where(
-			user.Email.Eq("aa@aa.com"),
-		).
-		Where(
-			user.StatusID.NEq(1),
+			user.StatusID.NotEq(1),
 		).
 		String()
 
@@ -59,7 +37,7 @@ func BenchmarkUpdateQuery(b *testing.B) {
 				user.Email.Eq("aa@aa.com"),
 			).
 			Where(
-				user.StatusID.NEq(1),
+				user.StatusID.NotEq(1),
 			).
 			String()
 	}

pool.go

@@ -1,105 +0,0 @@
-// Patial Tech.
-// Author, Ankit Patial
-
-package pgm
-
-import (
-	"context"
-	"errors"
-	"log/slog"
-	"strings"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-)
-
-var (
-	poolPGX           atomic.Pointer[pgxpool.Pool]
-	poolStringBuilder = sync.Pool{
-		New: func() any {
-			return new(strings.Builder)
-		},
-	}
-
-	ErrConnStringMissing = errors.New("connection string is empty")
-	ErrInitTX            = errors.New("failed to init db.tx")
-	ErrCommitTX          = errors.New("failed to commit db.tx")
-	ErrNoRows            = errors.New("no data found")
-)
-
-type Config struct {
-	ConnString      string
-	MaxConns        int32
-	MinConns        int32
-	MaxConnLifetime time.Duration
-	MaxConnIdleTime time.Duration
-}
-
-// InitPool will create new pgxpool.Pool and will keep it for its working
-func InitPool(conf Config) {
-	if conf.ConnString == "" {
-		panic(ErrConnStringMissing)
-	}
-
-	cfg, err := pgxpool.ParseConfig(conf.ConnString)
-	if err != nil {
-		panic(err)
-	}
-
-	if conf.MaxConns > 0 {
-		cfg.MaxConns = conf.MaxConns // 100
-	}
-
-	if conf.MinConns > 0 {
-		cfg.MinConns = conf.MaxConns // 5
-	}
-
-	if conf.MaxConnLifetime > 0 {
-		cfg.MaxConnLifetime = conf.MaxConnLifetime // time.Minute * 10
-	}
-
-	if conf.MaxConnIdleTime > 0 {
-		cfg.MaxConnIdleTime = conf.MaxConnIdleTime // time.Minute * 5
-	}
-
-	p, err := pgxpool.NewWithConfig(context.Background(), cfg)
-	if err != nil {
-		panic(err)
-	}
-
-	if err = p.Ping(context.Background()); err != nil {
-		panic(err)
-	}
-
-	poolPGX.Store(p)
-}
-
-// GetPool instance
-func GetPool() *pgxpool.Pool {
-	return poolPGX.Load()
-}
-
-// BeginTx begins a pgx poll transaction
-func BeginTx(ctx context.Context) (pgx.Tx, error) {
-	tx, err := poolPGX.Load().Begin(ctx)
-	if err != nil {
-		slog.Error(err.Error())
-		return nil, errors.New("failed to open db tx")
-	}
-
-	return tx, err
-}
-
-// get string builder from pool
-func getSB() *strings.Builder {
-	return poolStringBuilder.Get().(*strings.Builder)
-}
-
-// put string builder back to pool
-func putSB(sb *strings.Builder) {
-	sb.Reset()
-	poolStringBuilder.Put(sb)
-}

qry.go

@@ -7,156 +7,17 @@ import (
 	"context"
 	"strconv"
 	"strings"
+	"sync"
 
 	"github.com/jackc/pgx/v5"
 )
 
 type (
 	Clause interface {
+		Insert() InsertClause
 		Select(fields ...Field) SelectClause
-		// Insert() InsertSet
-		// Update() UpdateSet
-		// Delete() WhereOrExec
-	}
-
-	SelectClause interface {
-		// Join and Inner Join are same
-		Join(m Table, t1Field, t2Field Field) SelectClause
-		LeftJoin(m Table, t1Field, t2Field Field) SelectClause
-		RightJoin(m Table, t1Field, t2Field Field) SelectClause
-		FullJoin(m Table, t1Field, t2Field Field) SelectClause
-		CrossJoin(m Table) SelectClause
-		WhereClause
-		OrderByClause
-		GroupByClause
-		LimitClause
-		OffsetClause
-		Query
-		raw(prefixArgs []any) (string, []any)
-	}
-
-	WhereClause interface {
-		Where(cond ...Conditioner) AfterWhere
-	}
-
-	AfterWhere interface {
-		WhereClause
-		GroupByClause
-		OrderByClause
-		LimitClause
-		OffsetClause
-		Query
-	}
-
-	GroupByClause interface {
-		GroupBy(fields ...Field) AfterGroupBy
-	}
-
-	AfterGroupBy interface {
-		HavinClause
-		OrderByClause
-		LimitClause
-		OffsetClause
-		Query
-	}
-
-	HavinClause interface {
-		Having(cond ...Conditioner) AfterHaving
-	}
-
-	AfterHaving interface {
-		OrderByClause
-		LimitClause
-		OffsetClause
-		Query
-	}
-
-	OrderByClause interface {
-		OrderBy(fields ...Field) AfterOrderBy
-	}
-
-	AfterOrderBy interface {
-		LimitClause
-		OffsetClause
-		Query
-	}
-
-	LimitClause interface {
-		Limit(v int) AfterLimit
-	}
-
-	AfterLimit interface {
-		OffsetClause
-		Query
-	}
-
-	OffsetClause interface {
-		Offset(v int) AfterOffset
-	}
-
-	AfterOffset interface {
-		LimitClause
-		Query
-	}
-
-	Conditioner interface {
-		Condition(args *[]any, idx int) string
-	}
-
-	Insert interface {
-		Set(field Field, val any) InsertClause
-		SetMap(fields map[Field]any) InsertClause
-	}
-
-	InsertClause interface {
-		Insert
-		Returning(field Field) First
-		OnConflict(fields ...Field) Do
-		Execute
-		Stringer
-	}
-
-	Do interface {
-		DoNothing() Execute
-		DoUpdate(fields ...Field) Execute
-	}
-
-	Update interface {
-		Set(field Field, val any) UpdateClause
-		SetMap(fields map[Field]any) UpdateClause
-	}
-
-	UpdateClause interface {
-		Update
-		Where(cond ...Conditioner) WhereOrExec
-	}
-
-	WhereOrExec interface {
-		Where(cond ...Conditioner) WhereOrExec
-		Execute
-	}
-
-	Query interface {
-		First
-		All
-		Stringer
-	}
-
-	First interface {
-		First(ctx context.Context, dest ...any) error
-		FirstTx(ctx context.Context, tx pgx.Tx, dest ...any) error
-		Stringer
-	}
-
-	All interface {
-		// Query rows
-		//
-		// don't forget to close() rows
-		All(ctx context.Context, rows RowsCb) error
-		// Query rows
-		//
-		// don't forget to close() rows
-		AllTx(ctx context.Context, tx pgx.Tx, rows RowsCb) error
+		Update() UpdateClause
+		Delete() DeleteCluase
 	}
 
 	Execute interface {
@@ -169,26 +30,26 @@ type (
 		String() string
 	}
 
-	RowScanner interface {
-		Scan(dest ...any) error
+	Conditioner interface {
+		Condition(args *[]any, idx int) string
 	}
-
-	RowsCb func(row RowScanner) error
 )
 
-func joinFileds(fields []Field) string {
-	sb := getSB()
-	defer putSB(sb)
-	for i, f := range fields {
-		if i == 0 {
-			sb.WriteString(f.String())
-		} else {
-			sb.WriteString(", ")
-			sb.WriteString(f.String())
-		}
-	}
+var sbPool = sync.Pool{
+	New: func() any {
+		return new(strings.Builder)
+	},
+}
 
-	return sb.String()
+// get string builder from pool
+func getSB() *strings.Builder {
+	return sbPool.Get().(*strings.Builder)
+}
+
+// put string builder back to pool
+func putSB(sb *strings.Builder) {
+	sb.Reset()
+	sbPool.Put(sb)
 }
 
 func And(cond ...Conditioner) Conditioner {
@@ -208,12 +69,16 @@ func (cv *Cond) Condition(args *[]any, argIdx int) string {
 	}
 
 	// 2. normal condition
-	*args = append(*args, cv.Val)
 	var op string
-	if strings.HasSuffix(cv.op, "$") {
-		op = cv.op + strconv.Itoa(argIdx+1)
+	if cv.Val != nil {
+		*args = append(*args, cv.Val)
+		if strings.HasSuffix(cv.op, "$") {
+			op = cv.op + strconv.Itoa(argIdx+1)
+		} else {
+			op = strings.Replace(cv.op, "$", "$"+strconv.Itoa(argIdx+1), 1)
+		}
 	} else {
-		op = strings.Replace(cv.op, "$", "$"+strconv.Itoa(argIdx+1), 1)
+		op = cv.op
 	}
 
 	if cv.action == CondActionNeedToClose {

qry_delete.go

@@ -7,6 +7,10 @@ import (
 )
 
 type (
+	DeleteCluase interface {
+		WhereOrExec
+	}
+
 	deleteQry struct {
 		table     string
 		condition []Conditioner
@@ -15,15 +19,6 @@ type (
 	}
 )
 
-func (t *Table) Delete() WhereOrExec {
-	qb := &deleteQry{
-		table: t.Name,
-		debug: t.debug,
-	}
-
-	return qb
-}
-
 func (q *deleteQry) Where(cond ...Conditioner) WhereOrExec {
 	q.condition = append(q.condition, cond...)
 	return q

qry_insert.go

@@ -12,29 +12,33 @@ import (
 	"github.com/jackc/pgx/v5"
 )
 
-type insertQry struct {
-	returing   *string
-	onConflict *string
-
-	table          string
-	conflictAction string
-
-	fields []string
-	vals   []string
-	args   []any
-	debug  bool
-}
-
-func (t *Table) Insert() Insert {
-	qb := &insertQry{
-		table:  t.Name,
-		fields: make([]string, 0, t.FieldCount),
-		vals:   make([]string, 0, t.FieldCount),
-		args:   make([]any, 0, t.FieldCount),
-		debug:  t.debug,
+type (
+	InsertClause interface {
+		Insert
+		Returning(field Field) First
+		OnConflict(fields ...Field) Do
+		Execute
+		Stringer
 	}
-	return qb
-}
+
+	Insert interface {
+		Set(field Field, val any) InsertClause
+		SetMap(fields map[Field]any) InsertClause
+	}
+
+	insertQry struct {
+		returing   *string
+		onConflict *string
+
+		table          string
+		conflictAction string
+
+		fields []string
+		vals   []string
+		args   []any
+		debug  bool
+	}
+)
 
 func (q *insertQry) Set(field Field, val any) InsertClause {
 	q.fields = append(q.fields, field.Name())

qry_select.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"slices"
 	"strconv"
 	"strings"
 
@@ -14,6 +15,125 @@ import (
 )
 
 type (
+	SelectClause interface {
+		// Join and Inner Join are same
+		Join(m Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause
+		LeftJoin(m Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause
+		RightJoin(m Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause
+		FullJoin(m Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause
+		CrossJoin(m Table) SelectClause
+		WhereClause
+		OrderByClause
+		GroupByClause
+		LimitClause
+		OffsetClause
+		Query
+		raw(prefixArgs []any) (string, []any)
+	}
+
+	WhereClause interface {
+		Where(cond ...Conditioner) AfterWhere
+	}
+
+	AfterWhere interface {
+		WhereClause
+		GroupByClause
+		OrderByClause
+		LimitClause
+		OffsetClause
+		Query
+	}
+
+	GroupByClause interface {
+		GroupBy(fields ...Field) AfterGroupBy
+	}
+
+	AfterGroupBy interface {
+		HavinClause
+		OrderByClause
+		LimitClause
+		OffsetClause
+		Query
+	}
+
+	HavinClause interface {
+		Having(cond ...Conditioner) AfterHaving
+	}
+
+	AfterHaving interface {
+		OrderByClause
+		LimitClause
+		OffsetClause
+		Query
+	}
+
+	OrderByClause interface {
+		OrderBy(fields ...Field) AfterOrderBy
+	}
+
+	AfterOrderBy interface {
+		LimitClause
+		OffsetClause
+		Query
+	}
+
+	LimitClause interface {
+		Limit(v int) AfterLimit
+	}
+
+	AfterLimit interface {
+		OffsetClause
+		Query
+	}
+
+	OffsetClause interface {
+		Offset(v int) AfterOffset
+	}
+
+	AfterOffset interface {
+		LimitClause
+		Query
+	}
+
+	Do interface {
+		DoNothing() Execute
+		DoUpdate(fields ...Field) Execute
+	}
+
+	Query interface {
+		First
+		All
+		Stringer
+		Bulder
+	}
+
+	RowScanner interface {
+		Scan(dest ...any) error
+	}
+
+	RowsCb func(row RowScanner) error
+
+	First interface {
+		First(ctx context.Context, dest ...any) error
+		FirstTx(ctx context.Context, tx pgx.Tx, dest ...any) error
+		Stringer
+	}
+
+	All interface {
+		// Query rows
+		//
+		// don't forget to close() rows
+		All(ctx context.Context, rows RowsCb) error
+		// Query rows
+		//
+		// don't forget to close() rows
+		AllTx(ctx context.Context, tx pgx.Tx, rows RowsCb) error
+	}
+
+	Bulder interface {
+		Build(needArgs bool) (qry string, args []any)
+	}
+
 	selectQry struct {
 		table   string
 		fields  []Field
@@ -23,9 +143,11 @@ type (
 		groupBy []Field
 		having  []Conditioner
 		orderBy []Field
-		limit   int
-		offset  int
-		debug   bool
+
+		limit  int
+		offset int
+
+		debug bool
 	}
 
 	CondAction uint8
@@ -51,34 +173,46 @@ const (
 	CondActionSubQuery
 )
 
-// Select clause
-func (t Table) Select(field ...Field) SelectClause {
-	qb := &selectQry{
-		table:  t.Name,
-		debug:  t.debug,
-		fields: field,
+func (q *selectQry) Join(t Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause {
+	return q.buildJoin(t, "JOIN", t1Field, t2Field, cond...)
+}
+
+func (q *selectQry) LeftJoin(t Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause {
+	return q.buildJoin(t, "LEFT JOIN", t1Field, t2Field, cond...)
+}
+
+func (q *selectQry) RightJoin(t Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause {
+	return q.buildJoin(t, "RIGHT JOIN", t1Field, t2Field, cond...)
+}
+
+func (q *selectQry) FullJoin(t Table, t1Field, t2Field Field, cond ...Conditioner) SelectClause {
+	return q.buildJoin(t, "FULL JOIN", t1Field, t2Field, cond...)
+}
+
+func (q *selectQry) buildJoin(t Table, joinKW string, t1Field, t2Field Field, cond ...Conditioner) SelectClause {
+	str := joinKW + " " + t.Name + " ON " + t1Field.String() + " = " + t2Field.String()
+	if len(cond) == 0 { // Join with no condition
+		q.join = append(q.join, str)
+		return q
 	}
 
-	return qb
-}
+	// Join has condition(s)
+	sb := getSB()
+	defer putSB(sb)
+	sb.Grow(len(str) * 2)
 
-func (q *selectQry) Join(t Table, t1Field, t2Field Field) SelectClause {
-	q.join = append(q.join, "JOIN "+t.Name+" ON "+t1Field.String()+" = "+t2Field.String())
-	return q
-}
+	sb.WriteString(str + " AND ")
 
-func (q *selectQry) LeftJoin(t Table, t1Field, t2Field Field) SelectClause {
-	q.join = append(q.join, "LEFT JOIN "+t.Name+" ON "+t1Field.String()+" = "+t2Field.String())
-	return q
-}
+	var argIdx int
+	for i, c := range cond {
+		argIdx = len(q.args)
+		if i > 0 {
+			sb.WriteString(" AND ")
+		}
+		sb.WriteString(c.Condition(&q.args, argIdx))
+	}
 
-func (q *selectQry) RightJoin(t Table, t1Field, t2Field Field) SelectClause {
-	q.join = append(q.join, "RIGHT JOIN "+t.Name+" ON "+t1Field.String()+" = "+t2Field.String())
-	return q
-}
-
-func (q *selectQry) FullJoin(t Table, t1Field, t2Field Field) SelectClause {
-	q.join = append(q.join, "FULL JOIN "+t.Name+" ON "+t1Field.String()+" = "+t2Field.String())
+	q.join = append(q.join, sb.String())
 	return q
 }
 
@@ -163,6 +297,17 @@ func (q *selectQry) raw(prefixArgs []any) (string, []any) {
 }
 
 func (q *selectQry) String() string {
+	qry, _ := q.Build(false)
+	if q.debug {
+		fmt.Println("***")
+		fmt.Println(qry)
+		fmt.Printf("%+v\n", q.args)
+		fmt.Println("***")
+	}
+	return qry
+}
+
+func (q *selectQry) Build(needArgs bool) (qry string, args []any) {
 	sb := getSB()
 	defer putSB(sb)
 
@@ -228,14 +373,19 @@ func (q *selectQry) String() string {
 		sb.WriteString(strconv.Itoa(q.offset))
 	}
 
-	qry := sb.String()
+	qry = sb.String()
 	if q.debug {
 		fmt.Println("***")
 		fmt.Println(qry)
 		fmt.Printf("%+v\n", q.args)
 		fmt.Println("***")
 	}
-	return qry
+
+	if needArgs {
+		args = slices.Clone(q.args)
+	}
+
+	return
 }
 
 func (q *selectQry) averageLen() int {

qry_update.go

@@ -11,23 +11,30 @@ import (
 	"github.com/jackc/pgx/v5"
 )
 
-type updateQry struct {
-	table     string
-	cols      []string
-	condition []Conditioner
-	args      []any
-	debug     bool
-}
-
-func (t *Table) Update() Update {
-	qb := &updateQry{
-		table: t.Name,
-		debug: t.debug,
-		cols:  make([]string, 0, t.FieldCount),
-		args:  make([]any, 0, t.FieldCount),
+type (
+	Update interface {
+		Set(field Field, val any) UpdateClause
+		SetMap(fields map[Field]any) UpdateClause
 	}
-	return qb
-}
+
+	UpdateClause interface {
+		Update
+		Where(cond ...Conditioner) WhereOrExec
+	}
+
+	WhereOrExec interface {
+		Where(cond ...Conditioner) WhereOrExec
+		Execute
+	}
+
+	updateQry struct {
+		table     string
+		cols      []string
+		condition []Conditioner
+		args      []any
+		debug     bool
+	}
+)
 
 func (q *updateQry) Set(field Field, val any) UpdateClause {
 	col := field.Name()