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https://gitee.com/dromara/mayfly-go
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113 lines
3.7 KiB
Go
113 lines
3.7 KiB
Go
package application
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import (
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"fmt"
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"mayfly-go/pkg/biz"
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)
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// ---------------------------------- mysql元数据 -----------------------------------
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const (
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// mysql 表信息元数据
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MYSQL_TABLE_MA = `SELECT table_name tableName, engine, table_comment tableComment,
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create_time createTime from information_schema.tables
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WHERE table_schema = (SELECT database()) LIMIT 2000`
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// mysql 表信息
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MYSQL_TABLE_INFO = `SELECT table_name tableName, table_comment tableComment, table_rows tableRows,
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data_length dataLength, index_length indexLength, create_time createTime
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FROM information_schema.tables
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WHERE table_schema = (SELECT database()) LIMIT 2000`
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// mysql 索引信息
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MYSQL_INDEX_INFO = `SELECT index_name indexName, column_name columnName, index_type indexType,
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SEQ_IN_INDEX seqInIndex, INDEX_COMMENT indexComment
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FROM information_schema.STATISTICS
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WHERE table_schema = (SELECT database()) AND table_name = '%s' LIMIT 500`
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// mysql 列信息元数据
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MYSQL_COLUMN_MA = `SELECT table_name tableName, column_name columnName, column_type columnType,
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column_comment columnComment, column_key columnKey, extra, is_nullable nullable from information_schema.columns
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WHERE table_name in (%s) AND table_schema = (SELECT database()) ORDER BY tableName, ordinal_position LIMIT %d, %d`
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// mysql 列信息元数据总数
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MYSQL_COLOUMN_MA_COUNT = `SELECT COUNT(*) maNum from information_schema.columns
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WHERE table_name in (%s) AND table_schema = (SELECT database())`
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)
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type MysqlMetadata struct {
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di *DbInstance
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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 (mm *MysqlMetadata) GetTables() []map[string]interface{} {
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_, res, _ := mm.di.SelectData(MYSQL_TABLE_MA)
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return res
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}
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// 获取列元信息, 如列名等
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func (mm *MysqlMetadata) GetColumns(tableNames ...string) []map[string]interface{} {
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var sql, tableName string
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for i := 0; i < len(tableNames); i++ {
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if i != 0 {
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tableName = tableName + ", "
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}
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tableName = tableName + "'" + tableNames[i] + "'"
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}
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pageNum := 1
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// 如果大于一个表，则统计列数并分页获取
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if len(tableNames) > 1 {
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countSql := fmt.Sprintf(MYSQL_COLOUMN_MA_COUNT, tableName)
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_, countRes, _ := mm.di.SelectData(countSql)
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maCount := 0
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// 查询出所有列信息总数，手动分页获取所有数据
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if count64, is64 := countRes[0]["maNum"].(int64); is64 {
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maCount = int(count64)
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} else {
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maCount = countRes[0]["maNum"].(int)
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}
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// 计算需要查询的页数
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pageNum = maCount / DEFAULT_COLUMN_SIZE
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if maCount%DEFAULT_COLUMN_SIZE > 0 {
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pageNum++
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}
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}
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res := make([]map[string]interface{}, 0)
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for index := 0; index < pageNum; index++ {
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sql = fmt.Sprintf(MYSQL_COLUMN_MA, tableName, index*DEFAULT_COLUMN_SIZE, DEFAULT_COLUMN_SIZE)
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_, result, err := mm.di.SelectData(sql)
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biz.ErrIsNilAppendErr(err, "获取数据库列信息失败: %s")
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res = append(res, result...)
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}
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return res
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}
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// 获取表主键字段名，默认第一个字段
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func (mm *MysqlMetadata) GetPrimaryKey(tablename string) string {
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columns := mm.GetColumns(tablename)
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if len(columns) == 0 {
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panic(biz.NewBizErr(fmt.Sprintf("[%s] 表不存在", tablename)))
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}
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return columns[0]["columnName"].(string)
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}
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// 获取表信息，比GetTableMetedatas获取更详细的表信息
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func (mm *MysqlMetadata) GetTableInfos() []map[string]interface{} {
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_, res, _ := mm.di.SelectData(MYSQL_TABLE_INFO)
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return res
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}
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// 获取表索引信息
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func (mm *MysqlMetadata) GetTableIndex(tableName string) []map[string]interface{} {
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_, res, _ := mm.di.SelectData(fmt.Sprintf(MYSQL_INDEX_INFO, tableName))
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return res
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}
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// 获取建表ddl
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func (mm *MysqlMetadata) GetCreateTableDdl(tableName string) []map[string]interface{} {
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_, res, _ := mm.di.SelectData(fmt.Sprintf("show create table %s ", tableName))
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return res
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}
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