96 lines
1.8 KiB
Go
Executable File
96 lines
1.8 KiB
Go
Executable File
package schema
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import (
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"git.fsdpf.net/go/db/v2"
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)
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type Builder struct {
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db *db.Database // The database connection instance
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schema Schema // The schema grammar instance
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}
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func New(db *db.Database) *Builder {
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return &Builder{
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db: db,
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schema: GetSchemaDialect(db),
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}
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}
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// 判断数据表是否存在
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func (this Builder) HasTable(table string) (bool, error) {
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return this.schema.TableExists(table)
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}
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// 判断数据库列是否存在
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func (this Builder) GetColumnListing(table string) (columns []string, err error) {
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return this.schema.GetColumnListing(table)
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}
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// 修改表
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func (this Builder) Table(table string, cb func(*Blueprint)) error {
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bp := NewBlueprint(table)
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cb(bp)
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return this.Build(bp)
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}
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// 创建表
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func (this Builder) Create(table string, cb func(*Blueprint)) error {
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bp := NewBlueprint(table)
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bp.Create()
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cb(bp)
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return this.Build(bp)
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}
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// 修改表名
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func (this Builder) Rename(from, to string) error {
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bp := NewBlueprint(from)
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bp.Rename(to)
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return this.Build(bp)
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}
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// 删除表
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func (this Builder) Drop(table string) error {
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bp := NewBlueprint(table)
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bp.Drop()
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return this.Build(bp)
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}
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// 删除表, 先判断再删除
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func (this Builder) DropIfExists(table string) error {
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bp := NewBlueprint(table)
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bp.DropIfExists()
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return this.Build(bp)
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}
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// toSql
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func (this Builder) ToSQL(bp *Blueprint) []string {
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return bp.ToSql(this.schema)
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}
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// Build execute the blueprint to build / modify the table
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func (this Builder) Build(bp *Blueprint) error {
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sqls := this.ToSQL(bp)
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if len(sqls) == 0 {
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return nil
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}
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tx, err := this.db.Begin()
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if err != nil {
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return err
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}
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err = tx.Wrap(func() error {
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for _, sql := range sqls {
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if _, err := tx.Exec(sql); err != nil {
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return err
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}
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}
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return nil
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})
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return err
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}
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