feat: 小问题修复

server/internal/db/application/pgsql_meta.go

@@ -0,0 +1,128 @@
+package application
+
+import (
+	"fmt"
+	"mayfly-go/pkg/biz"
+)
+
+// ---------------------------------- pgsql元数据 -----------------------------------
+const (
+	// postgres 表信息元数据
+	PGSQL_TABLE_MA = `SELECT obj_description(c.oid) AS "tableComment", c.relname AS "tableName" FROM pg_class c 
+	JOIN pg_namespace n ON c.relnamespace = n.oid WHERE n.nspname = (select current_schema()) AND c.reltype > 0`
+
+	PGSQL_TABLE_INFO = `SELECT obj_description(c.oid) AS "tableComment", c.relname AS "tableName" FROM pg_class c 
+	JOIN pg_namespace n ON c.relnamespace = n.oid WHERE n.nspname = (select current_schema()) AND c.reltype > 0`
+
+	PGSQL_INDEX_INFO = `SELECT indexname AS "indexName", indexdef AS "indexComment"
+	FROM pg_indexes WHERE schemaname =  (select current_schema()) AND tablename = '%s'`
+
+	PGSQL_COLUMN_MA = `SELECT
+		C.relname AS "tableName",
+		A.attname AS "columnName",
+		concat_ws ( '', t.typname, SUBSTRING ( format_type ( a.atttypid, a.atttypmod ) FROM '\(.*\)' ) ) AS "columnType",
+		d.description AS "columnComment" 
+	FROM
+		pg_attribute a LEFT JOIN pg_description d ON d.objoid = a.attrelid 
+		AND d.objsubid = A.attnum
+		LEFT JOIN pg_class c ON A.attrelid = c.oid
+		LEFT JOIN pg_namespace pn ON c.relnamespace = pn.oid
+		LEFT JOIN pg_type t ON a.atttypid = t.oid 
+	WHERE
+		A.attnum >= 0 
+		AND pn.nspname = (select current_schema())
+		AND C.relname in (%s)
+	ORDER BY
+		C.relname DESC,
+		A.attnum ASC
+	OFFSET %d LIMIT %d	
+	`
+
+	PGSQL_COLUMN_MA_COUNT = `SELECT COUNT(*) "maNum"
+	FROM
+		pg_attribute a LEFT JOIN pg_description d ON d.objoid = a.attrelid 
+		AND d.objsubid = A.attnum
+		LEFT JOIN pg_class c ON A.attrelid = c.oid
+		LEFT JOIN pg_namespace pn ON c.relnamespace = pn.oid
+		LEFT JOIN pg_type t ON a.atttypid = t.oid 
+	WHERE
+		A.attnum >= 0 
+		AND pn.nspname = (select current_schema())
+		AND C.relname in (%s)
+	`
+)
+
+type PgsqlMetadata struct {
+	di *DbInstance
+}
+
+// 获取表基础元信息, 如表名等
+func (pm *PgsqlMetadata) GetTables() []map[string]interface{} {
+	_, res, _ := pm.di.SelectData(PGSQL_TABLE_MA)
+	return res
+}
+
+// 获取列元信息, 如列名等
+func (pm *PgsqlMetadata) GetColumns(tableNames ...string) []map[string]interface{} {
+	var sql, tableName string
+	for i := 0; i < len(tableNames); i++ {
+		if i != 0 {
+			tableName = tableName + ", "
+		}
+		tableName = tableName + "'" + tableNames[i] + "'"
+	}
+
+	pageNum := 1
+	// 如果大于一个表，则统计列数并分页获取
+	if len(tableNames) > 1 {
+		countSql := fmt.Sprintf(PGSQL_COLUMN_MA_COUNT, tableName)
+		_, countRes, _ := pm.di.SelectData(countSql)
+		maCount := 0
+		// 查询出所有列信息总数，手动分页获取所有数据
+		if count64, is64 := countRes[0]["maNum"].(int64); is64 {
+			maCount = int(count64)
+		} else {
+			maCount = countRes[0]["maNum"].(int)
+		}
+		// 计算需要查询的页数
+		pageNum = maCount / DEFAULT_COLUMN_SIZE
+		if maCount%DEFAULT_COLUMN_SIZE > 0 {
+			pageNum++
+		}
+	}
+
+	res := make([]map[string]interface{}, 0)
+	for index := 0; index < pageNum; index++ {
+		sql = fmt.Sprintf(PGSQL_COLUMN_MA, tableName, index*DEFAULT_COLUMN_SIZE, DEFAULT_COLUMN_SIZE)
+		_, result, err := pm.di.SelectData(sql)
+		biz.ErrIsNilAppendErr(err, "获取数据库列信息失败: %s")
+		res = append(res, result...)
+	}
+	return res
+}
+
+// 获取表主键字段名，默认第一个字段
+func (pm *PgsqlMetadata) GetPrimaryKey(tablename string) string {
+	columns := pm.GetColumns(tablename)
+	if len(columns) == 0 {
+		panic(biz.NewBizErr(fmt.Sprintf("[%s] 表不存在", tablename)))
+	}
+	return columns[0]["columnName"].(string)
+}
+
+// 获取表信息，比GetTables获取更详细的表信息
+func (pm *PgsqlMetadata) GetTableInfos() []map[string]interface{} {
+	_, res, _ := pm.di.SelectData(PGSQL_TABLE_INFO)
+	return res
+}
+
+// 获取表索引信息
+func (pm *PgsqlMetadata) GetTableIndex(tableName string) []map[string]interface{} {
+	_, res, _ := pm.di.SelectData(fmt.Sprintf(PGSQL_INDEX_INFO, tableName))
+	return res
+}
+
+// 获取建表ddl
+func (mm *PgsqlMetadata) GetCreateTableDdl(tableName string) []map[string]interface{} {
+	return nil
+}