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table.go
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table.go
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package sqlike
import (
"context"
"reflect"
"strings"
"github.com/si3nloong/sqlike/v2/db"
"github.com/si3nloong/sqlike/v2/sql"
"github.com/si3nloong/sqlike/v2/x/reflext"
sqlstmt "github.com/si3nloong/sqlike/v2/sql/stmt"
)
// Table :
type Table struct {
// current database name
dbName string
// table name
name string
// default primary key
pk string
// sql client
client *Client
// sql driver
driver db.Driver
// sql dialect
dialect db.Dialect
// logger
logger db.Logger
}
// Rename : rename the current table name to new table name
func (tb *Table) Rename(ctx context.Context, name string) error {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.RenameTable(stmt, tb.dbName, tb.name, name)
_, err := db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
return err
}
// Exists : this will return true when the table exists in the database
func (tb *Table) Exists(ctx context.Context) bool {
var count int
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.HasTable(stmt, tb.dbName, tb.name)
if err := db.QueryRowContext(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
).Scan(&count); err != nil {
panic(err)
}
return count > 0
}
// Columns :
func (tb *Table) Columns() *ColumnView {
return &ColumnView{tb: tb}
}
// ListColumns : list all the column of the table.
func (tb *Table) ListColumns(ctx context.Context) ([]Column, error) {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.GetColumns(stmt, tb.dbName, tb.name)
rows, err := db.Query(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
if err != nil {
return nil, err
}
defer rows.Close()
columns := make([]Column, 0)
for i := 0; rows.Next(); i++ {
col := Column{}
if err := rows.Scan(
&col.Position,
&col.Name,
&col.Type,
&col.DefaultValue,
&col.IsNullable,
&col.DataType,
&col.Charset,
&col.Collation,
&col.Comment,
&col.Extra,
); err != nil {
return nil, err
}
col.Type = strings.ToUpper(col.Type)
col.DataType = strings.ToUpper(col.DataType)
columns = append(columns, col)
}
return columns, nil
}
// ListIndexes : list all the index of the table.
func (tb *Table) ListIndexes(ctx context.Context) ([]Index, error) {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.GetIndexes(stmt, tb.dbName, tb.name)
rows, err := db.Query(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
if err != nil {
return nil, err
}
defer rows.Close()
idxs := make([]Index, 0)
for i := 0; rows.Next(); i++ {
idx := Index{}
if err := rows.Scan(
&idx.Name,
&idx.Type,
&idx.IsUnique,
); err != nil {
return nil, err
}
idx.IsUnique = !idx.IsUnique
idxs = append(idxs, idx)
}
return idxs, nil
}
// MustMigrate : this will ensure the migrate is complete, otherwise it will panic
func (tb Table) MustMigrate(ctx context.Context, entity any) {
err := tb.Migrate(ctx, entity)
if err != nil {
panic(err)
}
}
// Migrate : migrate will create a new table follows by the definition of struct tag, alter when the table already exists
func (tb *Table) Migrate(ctx context.Context, entity any) error {
return tb.migrateOne(ctx, tb.client.cache, entity, false)
}
// UnsafeMigrate : unsafe migration will delete non-exist index and columns, beware when you use this
func (tb *Table) UnsafeMigrate(ctx context.Context, entity any) error {
return tb.migrateOne(ctx, tb.client.cache, entity, true)
}
// MustUnsafeMigrate : this will panic if it get error on unsafe migrate
func (tb *Table) MustUnsafeMigrate(ctx context.Context, entity any) {
err := tb.migrateOne(ctx, tb.client.cache, entity, true)
if err != nil {
panic(err)
}
}
// Truncate : delete all the table data.
func (tb *Table) Truncate(ctx context.Context) (err error) {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.TruncateTable(stmt, tb.dbName, tb.name)
_, err = db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
return
}
// DropIfExists : will drop the table only if it exists.
func (tb *Table) DropIfExists(ctx context.Context) (err error) {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.DropTable(stmt, tb.dbName, tb.name, true, false)
_, err = db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
return
}
// Drop : drop the table, but it might throw error when the table is not exists
func (tb *Table) Drop(ctx context.Context) (err error) {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.DropTable(stmt, tb.dbName, tb.name, false, false)
_, err = db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
return
}
// UnsafeDrop : drop the table without table is exists and foreign key constraint error
func (tb *Table) UnsafeDrop(ctx context.Context) (err error) {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.DropTable(stmt, tb.dbName, tb.name, true, true)
_, err = db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
)
return
}
// Replace :
func (tb *Table) Replace(ctx context.Context, fields []string, query *sql.SelectStmt) error {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
if err := tb.dialect.Replace(
stmt,
tb.dbName,
tb.name,
fields,
query,
); err != nil {
return err
}
if _, err := db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
); err != nil {
return err
}
return nil
}
// Indexes :
func (tb *Table) Indexes() *IndexView {
return &IndexView{tb: tb}
}
// HasIndexByName :
func (tb *Table) HasIndexByName(ctx context.Context, name string) (bool, error) {
return isIndexExists(
ctx,
tb.dbName,
tb.name,
name,
tb.driver,
tb.dialect,
tb.logger,
)
}
func (tb *Table) migrateOne(ctx context.Context, cache reflext.StructMapper, entity any, unsafe bool) error {
v := reflext.ValueOf(entity)
if !v.IsValid() {
return ErrInvalidInput
}
t := reflext.Deref(v.Type())
if !reflext.IsKind(t, reflect.Struct) {
return ErrExpectedStruct
}
cdc := cache.CodecByType(t)
fields := skipColumns(cdc.Properties(), nil)
if len(fields) < 1 {
return ErrEmptyFields
}
if !tb.Exists(ctx) {
return tb.createTable(ctx, fields)
}
columns, err := tb.ListColumns(ctx)
if err != nil {
return err
}
idxs, err := tb.ListIndexes(ctx)
if err != nil {
return err
}
return tb.alterTable(ctx, fields, columns, idxs, unsafe)
}
func (tb *Table) createTable(ctx context.Context, fields []reflext.FieldInfo) error {
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
if err := tb.dialect.CreateTable(
stmt,
tb.dbName,
tb.name,
tb.pk,
tb.client.DriverInfo,
fields,
); err != nil {
return err
}
if _, err := db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
); err != nil {
return err
}
return nil
}
func (tb *Table) alterTable(ctx context.Context, fields []reflext.FieldInfo, columns []Column, indexs []Index, unsafe bool) error {
cols := make([]string, len(columns))
for i, col := range columns {
cols[i] = col.Name
}
idxs := make([]string, len(indexs))
for i, idx := range indexs {
idxs[i] = idx.Name
}
stmt := sqlstmt.AcquireStmt(tb.dialect)
defer sqlstmt.ReleaseStmt(stmt)
tb.dialect.HasPrimaryKey(stmt, tb.dbName, tb.name)
var count uint
if err := db.QueryRowContext(
ctx,
tb.driver,
stmt,
tb.logger,
).Scan(&count); err != nil {
return err
}
stmt.Reset()
if err := tb.dialect.AlterTable(
stmt,
tb.dbName, tb.name, tb.pk, count > 0,
tb.client.DriverInfo,
fields, cols, idxs, unsafe,
); err != nil {
return err
}
if _, err := db.Execute(
ctx,
getDriverFromContext(ctx, tb.driver),
stmt,
tb.logger,
); err != nil {
return err
}
return nil
}