数据源

apps/visual/driver/pgsql_meta.go

@@ -0,0 +1,111 @@
+package driver
+
+import (
+	"database/sql"
+	"fmt"
+	"github.com/XM-GO/PandaKit/biz"
+	"pandax/apps/visual/entity"
+	"strings"
+
+	_ "github.com/lib/pq"
+)
+
+func getPgsqlDB(d *entity.VisualDataSource) (*sql.DB, error) {
+	dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
+		d.Db.Host, d.Db.Port, d.Db.Username, d.Db.Password, d.Db.Dbname)
+	if d.Db.Config != "" {
+		dsn = fmt.Sprintf("%s %s", dsn, strings.Join(strings.Split(d.Db.Config, "&"), " "))
+	}
+	return sql.Open("postgres", dsn)
+}
+
+// ---------------------------------- 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",
+		tc.is_nullable AS "nullable",
+		concat_ws ( '', t.typname, SUBSTRING ( format_type ( a.atttypid, a.atttypmod ) FROM '\(.*\)' ) ) AS "columnType",
+		(CASE WHEN ( SELECT COUNT(*) FROM pg_constraint WHERE conrelid = a.attrelid AND conkey[1]= attnum AND contype = 'p' ) > 0 THEN 'PRI' ELSE '' END ) AS "columnKey",
+		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 
+		JOIN information_schema.columns tc ON tc.column_name = a.attname AND tc.table_name = C.relname AND tc.table_schema = pn.nspname
+	WHERE
+		A.attnum >= 0 
+		AND pn.nspname = (select current_schema())
+		AND C.relname in (%s)
+	ORDER BY
+		C.relname DESC,
+		A.attnum ASC	
+	`
+)
+
+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, err := pm.di.innerSelect(PGSQL_TABLE_MA)
+	biz.ErrIsNilAppendErr(err, "获取表基本信息失败: %s")
+	return res
+}
+
+// 获取列元信息, 如列名等
+func (pm *PgsqlMetadata) GetColumns(tableNames ...string) []map[string]interface{} {
+	tableName := ""
+	for i := 0; i < len(tableNames); i++ {
+		if i != 0 {
+			tableName = tableName + ", "
+		}
+		tableName = tableName + "'" + tableNames[i] + "'"
+	}
+	result, err := pm.di.innerSelect(fmt.Sprintf(PGSQL_COLUMN_MA, tableName))
+	biz.ErrIsNilAppendErr(err, "获取数据库列信息失败: %s")
+	return result
+}
+
+func (pm *PgsqlMetadata) GetPrimaryKey(tablename string) string {
+	columns := pm.GetColumns(tablename)
+	biz.IsTrue(len(columns) > 0, "[%s] 表不存在", tablename)
+	for _, v := range columns {
+		if v["columnKey"].(string) == "PRI" {
+			return v["columnName"].(string)
+		}
+	}
+
+	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, err := pm.di.innerSelect(PGSQL_TABLE_INFO)
+	biz.ErrIsNilAppendErr(err, "获取表信息失败: %s")
+	return res
+}
+
+// 获取表索引信息
+func (pm *PgsqlMetadata) GetTableIndex(tableName string) []map[string]interface{} {
+	res, err := pm.di.innerSelect(fmt.Sprintf(PGSQL_INDEX_INFO, tableName))
+	biz.ErrIsNilAppendErr(err, "获取表索引信息失败: %s")
+	return res
+}
+
+func (pm *PgsqlMetadata) GetTableRecord(tableName string, pageNum, pageSize int) ([]string, []map[string]interface{}, error) {
+	return pm.di.SelectData(fmt.Sprintf("SELECT * FROM %s OFFSET %d LIMIT %d", tableName, (pageNum-1)*pageSize, pageSize))
+}