!108 feat：支持不同源数据库迁移

* feat：支持不同源数据库迁移
2025-11-04 00:10:25 +08:00 · 2024-03-15 09:01:51 +00:00
parent 263dfa6be7
commit bd1e83989d
44 changed files with 3064 additions and 104 deletions
--- a/server/internal/db/dbm/oracle/dialect.go
+++ b/server/internal/db/dbm/oracle/dialect.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"mayfly-go/internal/db/dbm/dbi"
 	"mayfly-go/pkg/logx"
+	"mayfly-go/pkg/utils/anyx"
 	"mayfly-go/pkg/utils/collx"
 	"strings"
 	"time"
@@ -157,3 +158,217 @@ func (od *OracleDialect) CopyTable(copy *dbi.DbCopyTable) error {
 	_, err := od.dc.Exec(fmt.Sprintf("create table \"%s\" as select * from \"%s\" %s", newTableName, copy.TableName, condition))
 	return err
 }
+
+func (od *OracleDialect) TransColumns(columns []dbi.Column) []dbi.Column {
+	var commonColumns []dbi.Column
+	for _, column := range columns {
+		// 取出当前数据库类型
+		arr := strings.Split(column.ColumnType, "(")
+		ctype := arr[0]
+
+		// 翻译为通用数据库类型
+		t1 := commonColumnTypeMap[ctype]
+		if t1 == "" {
+			ctype = "NVARCHAR2(2000)"
+		} else {
+			// 回写到列信息
+			if t1 == "NUMBER" {
+				// 如果是转number类型，需要根据公共类型加上长度, 如 bigint 需要转换为number(19,0)
+				if column.ColumnType == dbi.CommonTypeBigint {
+					ctype = t1 + "(19, 0)"
+				} else {
+					ctype = t1
+				}
+			} else if t1 != "NUMBER" && len(arr) > 1 {
+				ctype = t1 + "(" + arr[1]
+			} else {
+				ctype = t1
+			}
+		}
+		column.ColumnType = ctype
+		commonColumns = append(commonColumns, column)
+	}
+	return commonColumns
+}
+
+func (od *OracleDialect) CreateTable(commonColumns []dbi.Column, tableInfo dbi.Table, dropOldTable bool) (int, error) {
+	meta := od.dc.GetMetaData()
+	replacer := strings.NewReplacer(";", "", "'", "")
+	quoteTableName := meta.QuoteIdentifier(tableInfo.TableName)
+	if dropOldTable {
+		// 如果表存在，先删除表
+		dropSqlTmp := `
+declare
+      num number;
+begin
+    select count(1) into num from user_tables where table_name = '%s' and owner = (SELECT sys_context('USERENV', 'CURRENT_SCHEMA') FROM dual) ;
+    if num > 0 then
+        execute immediate 'drop table "%s"' ;
+    end if;
+end;
+`
+		_, _ = od.dc.Exec(fmt.Sprintf(dropSqlTmp, tableInfo.TableName, tableInfo.TableName))
+	}
+	// 组装建表语句
+	createSql := fmt.Sprintf("CREATE TABLE %s (", quoteTableName)
+	fields := make([]string, 0)
+	pks := make([]string, 0)
+	columnComments := make([]string, 0)
+	// 把通用类型转换为达梦类型
+	for _, column := range commonColumns {
+		// 取出当前数据库类型
+		arr := strings.Split(column.ColumnType, "(")
+		ctype := arr[0]
+		// 翻译为通用数据库类型
+		t1 := oracleColumnTypeMap[ctype]
+		if t1 == "" {
+			ctype = "NVARCHAR2(2000)"
+		} else {
+			// 回写到列信息
+			if len(arr) > 1 {
+				// 如果是字符串类型，长度最大4000，否则修改字段类型为clob
+				if strings.Contains(strings.ToLower(t1), "char") {
+					match := bracketsRegexp.FindStringSubmatch(column.ColumnType)
+					if len(match) > 1 {
+						size := anyx.ConvInt(match[1])
+						if size >= 4000 { // 如果长度超过4000，则替换为text类型
+							ctype = "CLOB"
+						} else {
+							ctype = fmt.Sprintf("%s(%d)", t1, size)
+						}
+					} else {
+						ctype = t1 + "(2000)"
+					}
+				} else {
+					ctype = t1 + "(" + arr[1]
+				}
+			} else {
+				ctype = t1
+			}
+		}
+		column.ColumnType = ctype
+
+		if column.IsPrimaryKey {
+			pks = append(pks, meta.QuoteIdentifier(column.ColumnName))
+		}
+		fields = append(fields, od.genColumnBasicSql(column))
+		// 防止注释内含有特殊字符串导致sql出错
+		comment := replacer.Replace(column.ColumnComment)
+		if comment != "" {
+			columnComments = append(columnComments, fmt.Sprintf("COMMENT ON COLUMN %s.%s IS '%s'", quoteTableName, meta.QuoteIdentifier(column.ColumnName), comment))
+		}
+	}
+	createSql += strings.Join(fields, ",")
+	if len(pks) > 0 {
+		createSql += fmt.Sprintf(", PRIMARY KEY (%s)", strings.Join(pks, ","))
+	}
+	createSql += ")"
+
+	tableCommentSql := ""
+	if tableInfo.TableComment != "" {
+		tableCommentSql = fmt.Sprintf(" COMMENT ON TABLE %s is '%s'", meta.QuoteIdentifier(tableInfo.TableName), replacer.Replace(tableInfo.TableComment))
+	}
+
+	// 需要分开执行sql
+	var err error
+	if createSql != "" {
+		_, err = od.dc.Exec(createSql)
+	}
+	if tableCommentSql != "" {
+		_, err = od.dc.Exec(tableCommentSql)
+	}
+	if len(columnComments) > 0 {
+		for _, commentSql := range columnComments {
+			_, err = od.dc.Exec(commentSql)
+		}
+	}
+
+	return 1, err
+}
+
+func (od *OracleDialect) genColumnBasicSql(column dbi.Column) string {
+	meta := od.dc.GetMetaData()
+	colName := meta.QuoteIdentifier(column.ColumnName)
+
+	if column.IsIdentity {
+		// 如果是自增，不需要设置默认值和空值，自增列数据类型必须是number
+		return fmt.Sprintf(" %s NUMBER generated by default as IDENTITY", colName)
+	}
+
+	nullAble := ""
+	if column.Nullable == "NO" {
+		nullAble = " NOT NULL"
+	}
+
+	defVal := "" // 默认值需要判断引号，如函数是不需要引号的
+	if column.ColumnDefault != "" {
+		mark := false
+		// 哪些字段类型默认值需要加引号
+		if collx.ArrayAnyMatches([]string{"CHAR", "LONG", "DATE", "TIME", "CLOB", "BLOB", "BFILE"}, column.ColumnType) {
+			// 默认值是时间日期函数的必须要加引号
+			val := strings.ToUpper(column.ColumnDefault)
+			if collx.ArrayAnyMatches([]string{"DATE", "TIMESTAMP"}, column.ColumnType) && val == "CURRENT_DATE" || val == "CURRENT_TIMESTAMP" {
+				mark = false
+			} else {
+				mark = true
+			}
+			if mark {
+				defVal = fmt.Sprintf(" DEFAULT '%s'", column.ColumnDefault)
+			} else {
+				defVal = fmt.Sprintf(" DEFAULT %s", column.ColumnDefault)
+			}
+		} else {
+			// 如果是数字，默认值提取数字
+			if collx.ArrayAnyMatches([]string{"NUM", "INT"}, column.ColumnType) {
+				match := bracketsRegexp.FindStringSubmatch(column.ColumnType)
+				if len(match) > 1 {
+					length := anyx.ConvInt(match[1])
+					defVal = fmt.Sprintf(" DEFAULT %d", length)
+				} else {
+					defVal = fmt.Sprintf(" DEFAULT 0")
+				}
+			}
+
+			defVal = fmt.Sprintf(" DEFAULT %s", column.ColumnDefault)
+		}
+	}
+
+	columnSql := fmt.Sprintf(" %s %s %s %s", colName, column.ColumnType, defVal, nullAble)
+	return columnSql
+}
+
+func (od *OracleDialect) CreateIndex(tableInfo dbi.Table, indexs []dbi.Index) error {
+	meta := od.dc.GetMetaData()
+	sqls := make([]string, 0)
+	comments := make([]string, 0)
+	for _, index := range indexs {
+		// 通过字段、表名拼接索引名
+		columnName := strings.ReplaceAll(index.ColumnName, "-", "")
+		columnName = strings.ReplaceAll(columnName, "_", "")
+		colName := strings.ReplaceAll(columnName, ",", "_")
+
+		keyType := "normal"
+		unique := ""
+		if index.IsUnique {
+			keyType = "unique"
+			unique = "unique"
+		}
+		indexName := fmt.Sprintf("%s_key_%s_%s", keyType, tableInfo.TableName, colName)
+
+		sqls = append(sqls, fmt.Sprintf("CREATE %s INDEX %s ON %s(%s)", unique, indexName, meta.QuoteIdentifier(tableInfo.TableName), index.ColumnName))
+		if index.IndexComment != "" {
+			comments = append(comments, fmt.Sprintf("COMMENT ON INDEX %s IS '%s'", indexName, index.IndexComment))
+		}
+	}
+	_, err := od.dc.Exec(strings.Join(sqls, ";"))
+
+	// 添加注释
+	if len(comments) > 0 {
+		_, err = od.dc.Exec(strings.Join(comments, ";"))
+	}
+	return err
+}
+
+func (od *OracleDialect) UpdateSequence(tableName string, columns []dbi.Column) {
+
+}