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https://gitee.com/dromara/mayfly-go
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129 lines
4.0 KiB
Go
129 lines
4.0 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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// ---------------------------------- pgsql元数据 -----------------------------------
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const (
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// postgres 表信息元数据
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PGSQL_TABLE_MA = `SELECT obj_description(c.oid) AS "tableComment", c.relname AS "tableName" FROM pg_class c
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JOIN pg_namespace n ON c.relnamespace = n.oid WHERE n.nspname = (select current_schema()) AND c.reltype > 0`
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PGSQL_TABLE_INFO = `SELECT obj_description(c.oid) AS "tableComment", c.relname AS "tableName" FROM pg_class c
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JOIN pg_namespace n ON c.relnamespace = n.oid WHERE n.nspname = (select current_schema()) AND c.reltype > 0`
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PGSQL_INDEX_INFO = `SELECT indexname AS "indexName", indexdef AS "indexComment"
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FROM pg_indexes WHERE schemaname = (select current_schema()) AND tablename = '%s'`
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PGSQL_COLUMN_MA = `SELECT
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C.relname AS "tableName",
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A.attname AS "columnName",
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concat_ws ( '', t.typname, SUBSTRING ( format_type ( a.atttypid, a.atttypmod ) FROM '\(.*\)' ) ) AS "columnType",
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d.description AS "columnComment"
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FROM
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pg_attribute a LEFT JOIN pg_description d ON d.objoid = a.attrelid
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AND d.objsubid = A.attnum
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LEFT JOIN pg_class c ON A.attrelid = c.oid
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LEFT JOIN pg_namespace pn ON c.relnamespace = pn.oid
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LEFT JOIN pg_type t ON a.atttypid = t.oid
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WHERE
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A.attnum >= 0
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AND pn.nspname = (select current_schema())
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AND C.relname in (%s)
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ORDER BY
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C.relname DESC,
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A.attnum ASC
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OFFSET %d LIMIT %d
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`
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PGSQL_COLUMN_MA_COUNT = `SELECT COUNT(*) "maNum"
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FROM
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pg_attribute a LEFT JOIN pg_description d ON d.objoid = a.attrelid
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AND d.objsubid = A.attnum
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LEFT JOIN pg_class c ON A.attrelid = c.oid
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LEFT JOIN pg_namespace pn ON c.relnamespace = pn.oid
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LEFT JOIN pg_type t ON a.atttypid = t.oid
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WHERE
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A.attnum >= 0
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AND pn.nspname = (select current_schema())
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AND C.relname in (%s)
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`
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)
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type PgsqlMetadata 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 (pm *PgsqlMetadata) GetTables() []map[string]interface{} {
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_, res, _ := pm.di.SelectData(PGSQL_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 (pm *PgsqlMetadata) 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(PGSQL_COLUMN_MA_COUNT, tableName)
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_, countRes, _ := pm.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(PGSQL_COLUMN_MA, tableName, index*DEFAULT_COLUMN_SIZE, DEFAULT_COLUMN_SIZE)
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_, result, err := pm.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 (pm *PgsqlMetadata) GetPrimaryKey(tablename string) string {
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columns := pm.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GetTables获取更详细的表信息
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func (pm *PgsqlMetadata) GetTableInfos() []map[string]interface{} {
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_, res, _ := pm.di.SelectData(PGSQL_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 (pm *PgsqlMetadata) GetTableIndex(tableName string) []map[string]interface{} {
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_, res, _ := pm.di.SelectData(fmt.Sprintf(PGSQL_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 *PgsqlMetadata) GetCreateTableDdl(tableName string) []map[string]interface{} {
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return nil
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}
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