refactor: dbm包重构

server/internal/db/dbm/sqlite/metadata.go

@@ -0,0 +1,178 @@
+package sqlite
+
+import (
+	"errors"
+	"fmt"
+	"mayfly-go/internal/db/dbm/dbi"
+	"mayfly-go/pkg/logx"
+	"mayfly-go/pkg/utils/anyx"
+	"regexp"
+	"strings"
+)
+
+const (
+	SQLITE_META_FILE      = "metasql/sqlite_meta.sql"
+	SQLITE_TABLE_INFO_KEY = "SQLITE_TABLE_INFO"
+	SQLITE_INDEX_INFO_KEY = "SQLITE_INDEX_INFO"
+)
+
+type SqliteMetaData struct {
+	dc *dbi.DbConn
+}
+
+func (sd *SqliteMetaData) GetDbServer() (*dbi.DbServer, error) {
+	_, res, err := sd.dc.Query("SELECT SQLITE_VERSION() as version")
+	if err != nil {
+		return nil, err
+	}
+	ds := &dbi.DbServer{
+		Version: anyx.ConvString(res[0]["version"]),
+	}
+	return ds, nil
+}
+
+func (sd *SqliteMetaData) GetDbNames() ([]string, error) {
+	databases := make([]string, 0)
+	_, res, err := sd.dc.Query("PRAGMA database_list")
+	if err != nil {
+		return nil, err
+	}
+	for _, re := range res {
+		databases = append(databases, anyx.ConvString(re["name"]))
+	}
+
+	return databases, nil
+}
+
+// 获取表基础元信息, 如表名等
+func (sd *SqliteMetaData) GetTables() ([]dbi.Table, error) {
+	_, res, err := sd.dc.Query(dbi.GetLocalSql(SQLITE_META_FILE, SQLITE_TABLE_INFO_KEY))
+	//cols, res, err := sd.dc.Query("SELECT datetime(1092941466, 'unixepoch')")
+	if err != nil {
+		return nil, err
+	}
+
+	tables := make([]dbi.Table, 0)
+	for _, re := range res {
+		tables = append(tables, dbi.Table{
+			TableName:    anyx.ConvString(re["tableName"]),
+			TableComment: anyx.ConvString(re["tableComment"]),
+			CreateTime:   anyx.ConvString(re["createTime"]),
+			TableRows:    anyx.ConvInt(re["tableRows"]),
+			DataLength:   anyx.ConvInt64(re["dataLength"]),
+			IndexLength:  anyx.ConvInt64(re["indexLength"]),
+		})
+	}
+	return tables, nil
+}
+
+// 获取列元信息, 如列名等
+func (sd *SqliteMetaData) GetColumns(tableNames ...string) ([]dbi.Column, error) {
+
+	columns := make([]dbi.Column, 0)
+
+	for i := 0; i < len(tableNames); i++ {
+		tableName := tableNames[i]
+		_, res, err := sd.dc.Query(fmt.Sprintf("PRAGMA table_info(%s)", tableName))
+		if err != nil {
+			logx.Error("获取数据库表字段结构出错", err.Error())
+			continue
+		}
+		for _, re := range res {
+			nullable := "YES"
+			if anyx.ConvInt(re["notnull"]) == 1 {
+				nullable = "NO"
+			}
+			// 去掉默认值的引号
+			defaultValue := anyx.ConvString(re["dflt_value"])
+			if strings.Contains(defaultValue, "'") {
+				defaultValue = strings.ReplaceAll(defaultValue, "'", "")
+			}
+			columns = append(columns, dbi.Column{
+				TableName:     tableName,
+				ColumnName:    anyx.ConvString(re["name"]),
+				ColumnType:    strings.ToLower(anyx.ConvString(re["type"])),
+				ColumnComment: "",
+				Nullable:      nullable,
+				IsPrimaryKey:  anyx.ConvInt(re["pk"]) == 1,
+				IsIdentity:    anyx.ConvInt(re["pk"]) == 1,
+				ColumnDefault: defaultValue,
+				NumScale:      "0",
+			})
+		}
+	}
+	return columns, nil
+}
+
+func (sd *SqliteMetaData) GetPrimaryKey(tableName string) (string, error) {
+	_, res, err := sd.dc.Query(fmt.Sprintf("PRAGMA table_info(%s)", tableName))
+	if err != nil {
+		return "", err
+	}
+	for _, re := range res {
+		if anyx.ConvInt(re["pk"]) == 1 {
+			return anyx.ConvString(re["name"]), nil
+		}
+	}
+
+	return "", errors.New("不存在主键")
+}
+
+// 解析索引创建语句以获取字段信息
+func extractIndexFields(indexSQL string) string {
+	// 使用正则表达式提取字段信息
+	re := regexp.MustCompile(`\((.*?)\)`)
+	match := re.FindStringSubmatch(indexSQL)
+	if len(match) > 1 {
+		fields := strings.Split(match[1], ",")
+		for i, field := range fields {
+			// 去除空格
+			fields[i] = strings.TrimSpace(field)
+		}
+		return strings.Join(fields, ",")
+	}
+	return ""
+}
+
+// 获取表索引信息
+func (sd *SqliteMetaData) GetTableIndex(tableName string) ([]dbi.Index, error) {
+	_, res, err := sd.dc.Query(fmt.Sprintf(dbi.GetLocalSql(SQLITE_META_FILE, SQLITE_INDEX_INFO_KEY), tableName))
+	if err != nil {
+		return nil, err
+	}
+
+	indexs := make([]dbi.Index, 0)
+	for _, re := range res {
+		indexSql := anyx.ConvString(re["indexSql"])
+		isUnique := strings.Contains(indexSql, "CREATE UNIQUE INDEX")
+
+		indexs = append(indexs, dbi.Index{
+			IndexName:    anyx.ConvString(re["indexName"]),
+			ColumnName:   extractIndexFields(indexSql),
+			IndexType:    anyx.ConvString(re["indexType"]),
+			IndexComment: anyx.ConvString(re["indexComment"]),
+			IsUnique:     isUnique,
+			SeqInIndex:   1,
+		})
+	}
+	// 把查询结果以索引名分组，索引字段以逗号连接
+	return indexs, nil
+}
+
+// 获取建表ddl
+func (sd *SqliteMetaData) GetTableDDL(tableName string) (string, error) {
+	_, res, err := sd.dc.Query("select sql from sqlite_master WHERE tbl_name=? order by type desc", tableName)
+	if err != nil {
+		return "", err
+	}
+	var builder strings.Builder
+	for _, re := range res {
+		builder.WriteString(anyx.ConvString(re["sql"]) + "; \n\n")
+	}
+
+	return builder.String(), nil
+}
+
+func (sd *SqliteMetaData) GetSchemas() ([]string, error) {
+	return nil, nil
+}