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https://gitee.com/dromara/mayfly-go
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365 lines
10 KiB
Go
365 lines
10 KiB
Go
package oracle
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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/logx"
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"mayfly-go/pkg/utils/collx"
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"mayfly-go/pkg/utils/stringx"
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"strings"
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"github.com/may-fly/cast"
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)
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// ---------------------------------- DM元数据 -----------------------------------
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const (
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ORACLE_META_FILE = "metasql/oracle_meta.sql"
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ORACLE_DB_SCHEMAS = "ORACLE_DB_SCHEMAS"
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ORACLE_TABLE_INFO_KEY = "ORACLE_TABLE_INFO"
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ORACLE_INDEX_INFO_KEY = "ORACLE_INDEX_INFO"
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ORACLE_COLUMN_MA_KEY = "ORACLE_COLUMN_MA"
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)
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type OracleMetaData struct {
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dbi.DefaultMetaData
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dc *dbi.DbConn
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}
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func (od *OracleMetaData) GetDbServer() (*dbi.DbServer, error) {
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_, res, err := od.dc.Query("select * from v$instance")
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if err != nil {
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return nil, err
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}
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ds := &dbi.DbServer{
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Version: cast.ToString(res[0]["VERSION"]),
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}
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return ds, nil
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}
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func (od *OracleMetaData) GetDbNames() ([]string, error) {
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_, res, err := od.dc.Query("SELECT name AS DBNAME FROM v$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, cast.ToString(re["DBNAME"]))
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}
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return databases, nil
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}
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func (od *OracleMetaData) GetTables(tableNames ...string) ([]dbi.Table, error) {
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meta := od.dc.GetMetaData()
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names := strings.Join(collx.ArrayMap[string, string](tableNames, func(val string) string {
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return fmt.Sprintf("'%s'", meta.RemoveQuote(val))
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}), ",")
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var res []map[string]any
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var err error
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sql, err := stringx.TemplateParse(dbi.GetLocalSql(ORACLE_META_FILE, ORACLE_TABLE_INFO_KEY), collx.M{"tableNames": names})
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if err != nil {
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return nil, err
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}
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_, res, err = od.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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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: cast.ToString(re["TABLE_NAME"]),
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TableComment: cast.ToString(re["TABLE_COMMENT"]),
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CreateTime: cast.ToString(re["CREATE_TIME"]),
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TableRows: cast.ToInt(re["TABLE_ROWS"]),
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DataLength: cast.ToInt64(re["DATA_LENGTH"]),
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IndexLength: cast.ToInt64(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 (od *OracleMetaData) GetColumns(tableNames ...string) ([]dbi.Column, error) {
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meta := od.dc.GetMetaData()
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tableName := strings.Join(collx.ArrayMap[string, string](tableNames, func(val string) string {
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return fmt.Sprintf("'%s'", meta.RemoveQuote(val))
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}), ",")
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// 如果表数量超过了1000，需要分批查询
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if len(tableNames) > 1000 {
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columns := make([]dbi.Column, 0)
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for i := 0; i < len(tableNames); i += 1000 {
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end := i + 1000
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if end > len(tableNames) {
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end = len(tableNames)
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}
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tables := tableNames[i:end]
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cols, err := od.GetColumns(tables...)
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if err != nil {
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return nil, err
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}
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columns = append(columns, cols...)
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}
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return columns, nil
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}
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_, res, err := od.dc.Query(fmt.Sprintf(dbi.GetLocalSql(ORACLE_META_FILE, ORACLE_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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columnHelper := meta.GetColumnHelper()
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columns := make([]dbi.Column, 0)
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for _, re := range res {
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column := dbi.Column{
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TableName: cast.ToString(re["TABLE_NAME"]),
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ColumnName: cast.ToString(re["COLUMN_NAME"]),
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DataType: dbi.ColumnDataType(cast.ToString(re["DATA_TYPE"])),
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CharMaxLength: cast.ToInt(re["CHAR_MAX_LENGTH"]),
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ColumnComment: cast.ToString(re["COLUMN_COMMENT"]),
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Nullable: cast.ToString(re["NULLABLE"]) == "YES",
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IsPrimaryKey: cast.ToInt(re["IS_PRIMARY_KEY"]) == 1,
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IsIdentity: cast.ToInt(re["IS_IDENTITY"]) == 1,
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ColumnDefault: cast.ToString(re["COLUMN_DEFAULT"]),
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NumPrecision: cast.ToInt(re["NUM_PRECISION"]),
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NumScale: cast.ToInt(re["NUM_SCALE"]),
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}
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columnHelper.FixColumn(&column)
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columns = append(columns, column)
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}
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return columns, nil
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}
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func (od *OracleMetaData) GetPrimaryKey(tablename string) (string, error) {
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columns, err := od.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 (od *OracleMetaData) GetTableIndex(tableName string) ([]dbi.Index, error) {
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_, res, err := od.dc.Query(fmt.Sprintf(dbi.GetLocalSql(ORACLE_META_FILE, ORACLE_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: cast.ToString(re["INDEX_NAME"]),
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ColumnName: cast.ToString(re["COLUMN_NAME"]),
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IndexType: cast.ToString(re["INDEX_TYPE"]),
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IndexComment: cast.ToString(re["INDEX_COMMENT"]),
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IsUnique: cast.ToInt(re["IS_UNIQUE"]) == 1,
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SeqInIndex: cast.ToInt(re["SEQ_IN_INDEX"]),
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IsPrimaryKey: cast.ToInt(re["IS_PRIMARY"]) == 1,
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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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// 获取建索引ddl
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func (od *OracleMetaData) GenerateIndexDDL(indexs []dbi.Index, tableInfo dbi.Table) []string {
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meta := od.dc.GetMetaData()
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sqls := make([]string, 0)
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comments := make([]string, 0)
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for _, index := range indexs {
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unique := ""
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if index.IsUnique {
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unique = "unique"
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}
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// 取出列名，添加引号
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cols := strings.Split(index.ColumnName, ",")
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colNames := make([]string, len(cols))
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for i, name := range cols {
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colNames[i] = meta.QuoteIdentifier(name)
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}
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sqls = append(sqls, fmt.Sprintf("CREATE %s INDEX %s ON %s(%s)", unique, index.IndexName, meta.QuoteIdentifier(tableInfo.TableName), strings.Join(colNames, ",")))
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}
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sqlArr := make([]string, 0)
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sqlArr = append(sqlArr, sqls...)
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if len(comments) > 0 {
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sqlArr = append(sqlArr, comments...)
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}
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return sqlArr
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}
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func (od *OracleMetaData) genColumnBasicSql(column dbi.Column) string {
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meta := od.dc.GetMetaData()
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colName := meta.QuoteIdentifier(column.ColumnName)
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if column.IsIdentity {
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// 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
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return fmt.Sprintf(" %s NUMBER generated by default as IDENTITY", colName)
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}
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nullAble := ""
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if !column.Nullable {
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nullAble = " NOT NULL"
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}
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defVal := ""
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if column.ColumnDefault != "" {
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defVal = fmt.Sprintf(" DEFAULT %v", column.ColumnDefault)
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}
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columnSql := fmt.Sprintf(" %s %s%s%s", colName, column.GetColumnType(), defVal, nullAble)
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return columnSql
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}
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// 获取建表ddl
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func (od *OracleMetaData) GenerateTableDDL(columns []dbi.Column, tableInfo dbi.Table, dropBeforeCreate bool) []string {
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meta := od.dc.GetMetaData()
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quoteTableName := meta.QuoteIdentifier(tableInfo.TableName)
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sqlArr := make([]string, 0)
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if dropBeforeCreate {
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dropSqlTmp := `
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declare
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num number;
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begin
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select count(1) into num from user_tables where table_name = '%s' and owner = (SELECT sys_context('USERENV', 'CURRENT_SCHEMA') FROM dual) ;
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if num > 0 then
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execute immediate 'drop table "%s"' ;
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end if;
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end`
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sqlArr = append(sqlArr, fmt.Sprintf(dropSqlTmp, tableInfo.TableName, tableInfo.TableName))
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}
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// 组装建表语句
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createSql := fmt.Sprintf("CREATE TABLE %s ( \n", quoteTableName)
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fields := make([]string, 0)
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pks := make([]string, 0)
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columnComments := make([]string, 0)
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// 把通用类型转换为达梦类型
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for _, column := range columns {
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if column.IsPrimaryKey {
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pks = append(pks, meta.QuoteIdentifier(column.ColumnName))
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}
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fields = append(fields, od.genColumnBasicSql(column))
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// 防止注释内含有特殊字符串导致sql出错
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if column.ColumnComment != "" {
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comment := meta.QuoteEscape(column.ColumnComment)
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columnComments = append(columnComments, fmt.Sprintf("COMMENT ON COLUMN %s.%s IS '%s'", quoteTableName, meta.QuoteIdentifier(column.ColumnName), comment))
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}
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}
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// 建表
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createSql += strings.Join(fields, ",\n")
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if len(pks) > 0 {
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createSql += fmt.Sprintf(", \nPRIMARY KEY (%s)", strings.Join(pks, ","))
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}
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createSql += "\n)"
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sqlArr = append(sqlArr, createSql)
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// 表注释
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tableCommentSql := ""
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if tableInfo.TableComment != "" {
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tableCommentSql = fmt.Sprintf("COMMENT ON TABLE %s is '%s'", meta.QuoteIdentifier(tableInfo.TableName), meta.QuoteEscape(tableInfo.TableComment))
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sqlArr = append(sqlArr, tableCommentSql)
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}
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// 列注释
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if len(columnComments) > 0 {
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sqlArr = append(sqlArr, columnComments...)
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}
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return sqlArr
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}
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// 获取建表ddl
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func (od *OracleMetaData) GetTableDDL(tableName string, dropBeforeCreate bool) (string, error) {
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// 1.获取表信息
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tbs, err := od.GetTables(tableName)
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tableInfo := &dbi.Table{}
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if err != nil || tbs == nil || len(tbs) <= 0 {
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logx.Errorf("获取表信息失败, %s", tableName)
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return "", err
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}
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tableInfo.TableName = tbs[0].TableName
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tableInfo.TableComment = tbs[0].TableComment
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// 2.获取列信息
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columns, err := od.GetColumns(tableName)
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if err != nil {
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logx.Errorf("获取列信息失败, %s", tableName)
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return "", err
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}
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tableDDLArr := od.GenerateTableDDL(columns, *tableInfo, dropBeforeCreate)
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// 3.获取索引信息
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indexs, err := od.GetTableIndex(tableName)
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if err != nil {
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logx.Errorf("获取索引信息失败, %s", tableName)
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return "", err
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}
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// 组装返回
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tableDDLArr = append(tableDDLArr, od.GenerateIndexDDL(indexs, *tableInfo)...)
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return strings.Join(tableDDLArr, ";\n"), 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 (od *OracleMetaData) GetSchemas() ([]string, error) {
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sql := dbi.GetLocalSql(ORACLE_META_FILE, ORACLE_DB_SCHEMAS)
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_, res, err := od.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, cast.ToString(re["USERNAME"]))
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}
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return schemaNames, nil
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}
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func (od *OracleMetaData) GetDataHelper() dbi.DataHelper {
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return new(DataHelper)
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}
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func (od *OracleMetaData) GetColumnHelper() dbi.ColumnHelper {
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return new(ColumnHelper)
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}
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