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https://gitee.com/dromara/mayfly-go
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refactor: dbm包重构
This commit is contained in:
meilin.huang
239
server/internal/db/dbm/dm/metadata.go
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239
server/internal/db/dbm/dm/metadata.go
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@@ -0,0 +1,239 @@
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package dm
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import (
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"fmt"
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"mayfly-go/internal/db/dbm/dbi"
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"mayfly-go/pkg/errorx"
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"mayfly-go/pkg/utils/anyx"
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"mayfly-go/pkg/utils/collx"
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"strings"
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)
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const (
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DM_META_FILE = "metasql/dm_meta.sql"
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DM_DB_SCHEMAS = "DM_DB_SCHEMAS"
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DM_TABLE_INFO_KEY = "DM_TABLE_INFO"
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DM_INDEX_INFO_KEY = "DM_INDEX_INFO"
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DM_COLUMN_MA_KEY = "DM_COLUMN_MA"
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)
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type DMMetaData struct {
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dc *dbi.DbConn
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}
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func (dd *DMMetaData) GetDbServer() (*dbi.DbServer, error) {
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_, res, err := dd.dc.Query("select * from v$instance")
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if err != nil {
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return nil, err
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}
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ds := &dbi.DbServer{
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Version: anyx.ConvString(res[0]["SVR_VERSION"]),
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}
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return ds, nil
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}
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func (dd *DMMetaData) GetDbNames() ([]string, error) {
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_, res, err := dd.dc.Query("SELECT name AS DBNAME FROM v$database")
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if err != nil {
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return nil, err
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}
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databases := make([]string, 0)
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for _, re := range res {
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databases = append(databases, anyx.ConvString(re["DBNAME"]))
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}
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return databases, nil
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}
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// 获取表基础元信息, 如表名等
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func (dd *DMMetaData) GetTables() ([]dbi.Table, error) {
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// 首先执行更新统计信息sql 这个统计信息在数据量比较大的时候就比较耗时，所以最好定时执行
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// _, _, err := pd.dc.Query("dbms_stats.GATHER_SCHEMA_stats(SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))")
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// 查询表信息
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_, res, err := dd.dc.Query(dbi.GetLocalSql(DM_META_FILE, DM_TABLE_INFO_KEY))
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if err != nil {
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return nil, err
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}
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tables := make([]dbi.Table, 0)
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for _, re := range res {
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tables = append(tables, dbi.Table{
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TableName: anyx.ConvString(re["TABLE_NAME"]),
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TableComment: anyx.ConvString(re["TABLE_COMMENT"]),
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CreateTime: anyx.ConvString(re["CREATE_TIME"]),
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TableRows: anyx.ConvInt(re["TABLE_ROWS"]),
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DataLength: anyx.ConvInt64(re["DATA_LENGTH"]),
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IndexLength: anyx.ConvInt64(re["INDEX_LENGTH"]),
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})
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}
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return tables, nil
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}
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// 获取列元信息, 如列名等
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func (dd *DMMetaData) GetColumns(tableNames ...string) ([]dbi.Column, error) {
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dbType := dd.dc.Info.Type
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tableName := strings.Join(collx.ArrayMap[string, string](tableNames, func(val string) string {
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return fmt.Sprintf("'%s'", dbType.RemoveQuote(val))
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}), ",")
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_, res, err := dd.dc.Query(fmt.Sprintf(dbi.GetLocalSql(DM_META_FILE, DM_COLUMN_MA_KEY), tableName))
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if err != nil {
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return nil, err
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}
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columns := make([]dbi.Column, 0)
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for _, re := range res {
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columns = append(columns, dbi.Column{
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TableName: anyx.ConvString(re["TABLE_NAME"]),
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ColumnName: anyx.ConvString(re["COLUMN_NAME"]),
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ColumnType: anyx.ConvString(re["COLUMN_TYPE"]),
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ColumnComment: anyx.ConvString(re["COLUMN_COMMENT"]),
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Nullable: anyx.ConvString(re["NULLABLE"]),
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IsPrimaryKey: anyx.ConvInt(re["IS_PRIMARY_KEY"]) == 1,
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IsIdentity: anyx.ConvInt(re["IS_IDENTITY"]) == 1,
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ColumnDefault: anyx.ConvString(re["COLUMN_DEFAULT"]),
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NumScale: anyx.ConvString(re["NUM_SCALE"]),
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})
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}
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return columns, nil
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}
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func (dd *DMMetaData) GetPrimaryKey(tablename string) (string, error) {
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columns, err := dd.GetColumns(tablename)
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if err != nil {
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return "", err
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}
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if len(columns) == 0 {
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return "", errorx.NewBiz("[%s] 表不存在", tablename)
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}
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for _, v := range columns {
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if v.IsPrimaryKey {
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return v.ColumnName, nil
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}
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}
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return columns[0].ColumnName, nil
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}
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// 获取表索引信息
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func (dd *DMMetaData) GetTableIndex(tableName string) ([]dbi.Index, error) {
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_, res, err := dd.dc.Query(fmt.Sprintf(dbi.GetLocalSql(DM_META_FILE, DM_INDEX_INFO_KEY), tableName))
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if err != nil {
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return nil, err
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}
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indexs := make([]dbi.Index, 0)
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for _, re := range res {
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indexs = append(indexs, dbi.Index{
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IndexName: anyx.ConvString(re["INDEX_NAME"]),
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ColumnName: anyx.ConvString(re["COLUMN_NAME"]),
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IndexType: anyx.ConvString(re["INDEX_TYPE"]),
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IndexComment: anyx.ConvString(re["INDEX_COMMENT"]),
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IsUnique: anyx.ConvInt(re["IS_UNIQUE"]) == 1,
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SeqInIndex: anyx.ConvInt(re["SEQ_IN_INDEX"]),
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})
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}
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// 把查询结果以索引名分组，索引字段以逗号连接
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result := make([]dbi.Index, 0)
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key := ""
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for _, v := range indexs {
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// 当前的索引名
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in := v.IndexName
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if key == in {
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// 索引字段已根据名称和顺序排序，故取最后一个即可
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i := len(result) - 1
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// 同索引字段以逗号连接
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result[i].ColumnName = result[i].ColumnName + "," + v.ColumnName
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} else {
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key = in
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result = append(result, v)
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}
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}
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return result, nil
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}
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// 获取建表ddl
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func (dd *DMMetaData) GetTableDDL(tableName string) (string, error) {
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ddlSql := fmt.Sprintf("CALL SP_TABLEDEF((SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID)), '%s')", tableName)
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_, res, err := dd.dc.Query(ddlSql)
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if err != nil {
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return "", err
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}
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// 建表ddl
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var builder strings.Builder
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for _, re := range res {
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builder.WriteString(re["COLUMN_VALUE"].(string))
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}
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// 表注释
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_, res, err = dd.dc.Query(fmt.Sprintf(`
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select OWNER, COMMENTS from ALL_TAB_COMMENTS where TABLE_TYPE='TABLE' and TABLE_NAME = '%s'
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and owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
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`, tableName))
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if err != nil {
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return "", err
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}
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for _, re := range res {
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// COMMENT ON TABLE "SYS_MENU" IS '菜单表';
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if re["COMMENTS"] != nil {
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tableComment := fmt.Sprintf("\n\nCOMMENT ON TABLE \"%s\".\"%s\" IS '%s';", re["OWNER"].(string), tableName, re["COMMENTS"].(string))
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builder.WriteString(tableComment)
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}
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}
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// 字段注释
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fieldSql := fmt.Sprintf(`
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SELECT OWNER, COLUMN_NAME, COMMENTS
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FROM USER_COL_COMMENTS
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WHERE OWNER = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
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AND TABLE_NAME = '%s'
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`, tableName)
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_, res, err = dd.dc.Query(fieldSql)
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if err != nil {
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return "", err
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}
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builder.WriteString("\n")
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for _, re := range res {
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// COMMENT ON COLUMN "SYS_MENU"."BIZ_CODE" IS '业务编码，应用编码1';
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if re["COMMENTS"] != nil {
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fieldComment := fmt.Sprintf("\nCOMMENT ON COLUMN \"%s\".\"%s\".\"%s\" IS '%s';", re["OWNER"].(string), tableName, re["COLUMN_NAME"].(string), re["COMMENTS"].(string))
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builder.WriteString(fieldComment)
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}
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}
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// 索引信息
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indexSql := fmt.Sprintf(`
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select indexdef(b.object_id,1) as INDEX_DEF from ALL_INDEXES a
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join ALL_objects b on a.owner = b.owner and b.object_name = a.index_name and b.object_type = 'INDEX'
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where a.owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
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and a.table_name = '%s'
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and indexdef(b.object_id,1) != '禁止查看系统定义的索引信息'
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`, tableName)
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_, res, err = dd.dc.Query(indexSql)
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if err != nil {
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return "", err
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}
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for _, re := range res {
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builder.WriteString("\n\n" + re["INDEX_DEF"].(string))
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}
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return builder.String(), nil
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}
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// 获取DM当前连接的库可访问的schemaNames
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func (dd *DMMetaData) GetSchemas() ([]string, error) {
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sql := dbi.GetLocalSql(DM_META_FILE, DM_DB_SCHEMAS)
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_, res, err := dd.dc.Query(sql)
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if err != nil {
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return nil, err
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}
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schemaNames := make([]string, 0)
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for _, re := range res {
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schemaNames = append(schemaNames, anyx.ConvString(re["SCHEMA_NAME"]))
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}
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return schemaNames, nil
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}
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