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https://gitee.com/dromara/mayfly-go
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110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
package dbi
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import (
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"errors"
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"io"
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"mayfly-go/internal/db/dbm/sqlparser"
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"mayfly-go/internal/db/dbm/sqlparser/pgsql"
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)
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const (
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// -1. 无操作
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DuplicateStrategyNone = -1
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// 1. 忽略
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DuplicateStrategyIgnore = 1
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// 2. 更新
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DuplicateStrategyUpdate = 2
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)
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type DbCopyTable struct {
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Id uint64 `json:"id"`
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Db string `json:"db" `
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TableName string `json:"tableName"`
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CopyData bool `json:"copyData"` // 是否复制数据
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}
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// BaseDialect 基础dialect，在DefaultDialect 都有默认的实现方法
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type BaseDialect interface {
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// Quoter sql关键字引用处理，如 table -> `table`、table -> "table"
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Quoter() Quoter
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// GetDbProgram 获取数据库程序模块，用于数据库备份与恢复
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GetDbProgram() (DbProgram, error)
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// GetDumpHeler
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GetDumpHelper() DumpHelper
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// GetSQLParser 获取sql解析器
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GetSQLParser() sqlparser.SqlParser
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}
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// -----------------------------------元数据接口定义------------------------------------------
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// Dialect 数据库方言 用于生成sql、批量插入等各个数据库方言不一致的实现方式
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type Dialect interface {
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BaseDialect
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// CopyTable 拷贝表
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CopyTable(copy *DbCopyTable) error
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// GetSQLGenerator 获取sql生成器
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GetSQLGenerator() SQLGenerator
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}
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// DefaultDialect 默认实现，若需要覆盖，则由各个数据库dialect实现去覆盖重写
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type DefaultDialect struct {
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}
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var _ (BaseDialect) = (*DefaultDialect)(nil)
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func (dx *DefaultDialect) Quoter() Quoter {
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return DefaultQuoter
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}
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func (dd *DefaultDialect) GetDbProgram() (DbProgram, error) {
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return nil, errors.New("not support db program")
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}
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func (dd *DefaultDialect) GetDumpHelper() DumpHelper {
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return new(DefaultDumpHelper)
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}
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func (pd *DefaultDialect) GetSQLParser() sqlparser.SqlParser {
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return new(pgsql.PgsqlParser)
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}
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// DumpHelper 导出辅助方法
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type DumpHelper interface {
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BeforeInsert(writer io.Writer, tableName string)
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BeforeInsertSql(quoteSchema string, quoteTableName string) string
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AfterInsert(writer io.Writer, tableName string, columns []Column)
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}
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type DefaultDumpHelper struct {
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}
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func (dd *DefaultDumpHelper) BeforeInsert(writer io.Writer, tableName string) {
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writer.Write([]byte("BEGIN;\n"))
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}
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func (dd *DefaultDumpHelper) BeforeInsertSql(quoteSchema string, quoteTableName string) string {
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return ""
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}
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func (dd *DefaultDumpHelper) AfterInsert(writer io.Writer, tableName string, columns []Column) {
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writer.Write([]byte("COMMIT;\n"))
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}
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type SQLGenerator interface {
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// GenTableDDL 生成建表语句
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GenTableDDL(table Table, columns []Column, dropBeforeCreate bool) []string
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// GenIndexDDL 生成索引语句
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GenIndexDDL(table Table, indexs []Index) []string
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// GenInsert 生成插入语句
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GenInsert(tableName string, columns []Column, values [][]any, duplicateStrategy int) []string
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}
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