mirror of
https://gitee.com/dromara/mayfly-go
synced 2025-11-04 00:10:25 +08:00
324 lines
9.2 KiB
Go
324 lines
9.2 KiB
Go
package sqlite
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import (
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"errors"
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"fmt"
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"mayfly-go/internal/db/dbm/dbi"
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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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"regexp"
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"strings"
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"github.com/may-fly/cast"
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)
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const (
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SQLITE_META_FILE = "metasql/sqlite_meta.sql"
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SQLITE_TABLE_INFO_KEY = "SQLITE_TABLE_INFO"
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SQLITE_INDEX_INFO_KEY = "SQLITE_INDEX_INFO"
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)
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type SqliteMetaData struct {
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dbi.DefaultMetaData
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dc *dbi.DbConn
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}
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func (sd *SqliteMetaData) GetDbServer() (*dbi.DbServer, error) {
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_, res, err := sd.dc.Query("SELECT SQLITE_VERSION() as version")
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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 (sd *SqliteMetaData) GetDbNames() ([]string, error) {
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databases := make([]string, 0)
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_, res, err := sd.dc.Query("PRAGMA database_list")
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if err != nil {
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return nil, err
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}
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for _, re := range res {
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databases = append(databases, cast.ToString(re["name"]))
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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 (sd *SqliteMetaData) GetTables(tableNames ...string) ([]dbi.Table, error) {
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names := strings.Join(collx.ArrayMap[string, string](tableNames, func(val string) string {
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return fmt.Sprintf("'%s'", dbi.RemoveQuote(sd, 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(SQLITE_META_FILE, SQLITE_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 = sd.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["tableName"]),
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TableComment: cast.ToString(re["tableComment"]),
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CreateTime: cast.ToString(re["createTime"]),
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TableRows: cast.ToInt(re["tableRows"]),
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DataLength: cast.ToInt64(re["dataLength"]),
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IndexLength: cast.ToInt64(re["indexLength"]),
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})
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}
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return tables, nil
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}
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// GetDataTypes 正则提取字段类型中的关键字，
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// 如 decimal(10,2) 提取decimal, 10 ,2
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// 如:text 提取text,null,null
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// 如:varchar(100) 提取varchar, 100
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func (sd *SqliteMetaData) getDataTypes(dataType string) (string, string, string) {
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matches := dataTypeRegexp.FindStringSubmatch(dataType)
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if len(matches) == 0 {
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return "", "", ""
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}
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return matches[1], matches[2], matches[3]
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}
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// 获取列元信息, 如列名等
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func (sd *SqliteMetaData) GetColumns(tableNames ...string) ([]dbi.Column, error) {
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columns := make([]dbi.Column, 0)
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columnHelper := sd.dc.GetMetaData().GetColumnHelper()
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for i := 0; i < len(tableNames); i++ {
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tableName := tableNames[i]
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_, res, err := sd.dc.Query(fmt.Sprintf("PRAGMA table_info(%s)", tableName))
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if err != nil {
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logx.Error("获取数据库表字段结构出错", err.Error())
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continue
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}
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for _, re := range res {
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// 去掉默认值的引号
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defaultValue := cast.ToString(re["dflt_value"])
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if strings.Contains(defaultValue, "'") {
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defaultValue = strings.ReplaceAll(defaultValue, "'", "")
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}
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column := dbi.Column{
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TableName: tableName,
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ColumnName: cast.ToString(re["name"]),
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ColumnComment: "",
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Nullable: cast.ToInt(re["notnull"]) != 1,
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IsPrimaryKey: cast.ToInt(re["pk"]) == 1,
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IsIdentity: cast.ToInt(re["pk"]) == 1,
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ColumnDefault: defaultValue,
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NumScale: 0,
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}
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// 切割类型和长度，如果长度内有逗号，则说明是decimal类型
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columnType := cast.ToString(re["type"])
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dataType, length, scale := sd.getDataTypes(columnType)
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if scale != "0" && scale != "" {
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column.NumPrecision = cast.ToInt(length)
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column.NumScale = cast.ToInt(scale)
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column.CharMaxLength = 0
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} else {
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column.CharMaxLength = cast.ToInt(length)
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}
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column.DataType = dbi.ColumnDataType(dataType)
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columnHelper.FixColumn(&column)
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columns = append(columns, column)
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}
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}
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return columns, nil
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}
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func (sd *SqliteMetaData) GetPrimaryKey(tableName string) (string, error) {
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_, res, err := sd.dc.Query(fmt.Sprintf("PRAGMA table_info(%s)", 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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if cast.ToInt(re["pk"]) == 1 {
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return cast.ToString(re["name"]), nil
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}
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}
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return "", errors.New("不存在主键")
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}
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// 解析索引创建语句以获取字段信息
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func extractIndexFields(indexSQL string) string {
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// 使用正则表达式提取字段信息
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re := regexp.MustCompile(`\((.*?)\)`)
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match := re.FindStringSubmatch(indexSQL)
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if len(match) > 1 {
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fields := strings.Split(match[1], ",")
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for i, field := range fields {
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// 去除空格
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fields[i] = strings.TrimSpace(field)
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}
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return strings.Join(fields, ",")
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}
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return ""
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}
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// 获取表索引信息
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func (sd *SqliteMetaData) GetTableIndex(tableName string) ([]dbi.Index, error) {
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_, res, err := sd.dc.Query(fmt.Sprintf(dbi.GetLocalSql(SQLITE_META_FILE, SQLITE_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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indexSql := cast.ToString(re["indexSql"])
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isUnique := strings.Contains(indexSql, "CREATE UNIQUE INDEX")
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indexs = append(indexs, dbi.Index{
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IndexName: cast.ToString(re["indexName"]),
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ColumnName: extractIndexFields(indexSql),
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IndexType: cast.ToString(re["indexType"]),
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IndexComment: cast.ToString(re["indexComment"]),
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IsUnique: isUnique,
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SeqInIndex: 1,
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IsPrimaryKey: false,
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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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return indexs, nil
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}
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// 获取建索引ddl
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func (sd *SqliteMetaData) GenerateIndexDDL(indexs []dbi.Index, tableInfo dbi.Table) []string {
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meta := sd.dc.GetMetaData()
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sqls := 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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// 创建前尝试删除
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sqls = append(sqls, fmt.Sprintf("DROP INDEX IF EXISTS \"%s\"", index.IndexName))
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sqlTmp := "CREATE %s INDEX %s ON %s (%s) "
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sqls = append(sqls, fmt.Sprintf(sqlTmp, unique, meta.QuoteIdentifier(index.IndexName), meta.QuoteIdentifier(tableInfo.TableName), strings.Join(colNames, ",")))
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}
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return sqls
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}
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func (sd *SqliteMetaData) genColumnBasicSql(column dbi.Column) string {
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incr := ""
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if column.IsIdentity {
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incr = " AUTOINCREMENT"
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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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quoteColumnName := sd.dc.GetMetaData().QuoteIdentifier(column.ColumnName)
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// 如果是主键，则直接返回，不判断默认值
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if column.IsPrimaryKey {
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return fmt.Sprintf(" %s integer PRIMARY KEY%s%s", quoteColumnName, incr, nullAble)
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}
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defVal := "" // 默认值需要判断引号，如函数是不需要引号的 // 为了防止跨源函数不支持 当默认值是函数时，不需要设置默认值
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if column.ColumnDefault != "" && !strings.Contains(column.ColumnDefault, "(") {
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// 哪些字段类型默认值需要加引号
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mark := false
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if collx.ArrayAnyMatches([]string{"char", "text", "date", "time", "lob"}, strings.ToLower(string(column.DataType))) {
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// 当数据类型是日期时间，默认值是日期时间函数时，默认值不需要引号
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if collx.ArrayAnyMatches([]string{"date", "time"}, strings.ToLower(string(column.DataType))) &&
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collx.ArrayAnyMatches([]string{"DATE", "TIME"}, strings.ToUpper(column.ColumnDefault)) {
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mark = false
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} else {
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mark = true
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}
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}
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if mark {
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defVal = fmt.Sprintf(" DEFAULT '%s'", column.ColumnDefault)
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} else {
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defVal = fmt.Sprintf(" DEFAULT %s", column.ColumnDefault)
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}
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}
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return fmt.Sprintf(" %s %s%s%s", quoteColumnName, column.GetColumnType(), nullAble, defVal)
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}
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// 获取建表ddl
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func (sd *SqliteMetaData) GenerateTableDDL(columns []dbi.Column, tableInfo dbi.Table, dropBeforeCreate bool) []string {
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sqlArr := make([]string, 0)
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tbName := sd.dc.GetMetaData().QuoteIdentifier(tableInfo.TableName)
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if dropBeforeCreate {
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sqlArr = append(sqlArr, fmt.Sprintf("DROP TABLE IF EXISTS %s", tbName))
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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", tbName)
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fields := 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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fields = append(fields, sd.genColumnBasicSql(column))
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}
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createSql += strings.Join(fields, ",\n")
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createSql += "\n)"
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sqlArr = append(sqlArr, createSql)
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return sqlArr
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}
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// 获取建表ddl
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func (sd *SqliteMetaData) GetTableDDL(tableName string, dropBeforeCreate bool) (string, error) {
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var builder strings.Builder
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if dropBeforeCreate {
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builder.WriteString(fmt.Sprintf("DROP TABLE IF EXISTS %s; \n\n", tableName))
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}
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_, res, err := sd.dc.Query("select sql from sqlite_master WHERE tbl_name=? order by type desc", 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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builder.WriteString(cast.ToString(re["sql"]) + "; \n\n")
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}
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return builder.String(), nil
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}
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func (sd *SqliteMetaData) GetSchemas() ([]string, error) {
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return nil, nil
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}
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func (sd *SqliteMetaData) GetDataHelper() dbi.DataHelper {
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return new(DataHelper)
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}
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func (sd *SqliteMetaData) GetColumnHelper() dbi.ColumnHelper {
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return new(ColumnHelper)
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}
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func (sd *SqliteMetaData) GetDumpHelper() dbi.DumpHelper {
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return new(DumpHelper)
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}
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