mirror of
https://gitee.com/XM-GO/PandaX.git
synced 2026-04-23 02:48:34 +08:00
91 lines
3.1 KiB
Go
91 lines
3.1 KiB
Go
package driver
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import (
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"database/sql"
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"fmt"
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"github.com/XM-GO/PandaKit/biz"
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"pandax/apps/visual/entity"
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"strings"
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_ "github.com/lib/pq"
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)
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func getPgsqlDB(d *entity.VisualDataSource) (*sql.DB, error) {
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dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
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d.Db.Host, d.Db.Port, d.Db.Username, d.Db.Password, d.Db.Dbname)
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if d.Db.Config != "" {
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dsn = fmt.Sprintf("%s %s", dsn, strings.Join(strings.Split(d.Db.Config, "&"), " "))
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}
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return sql.Open("postgres", dsn)
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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_COLUMN_MA = `SELECT
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C.relname AS "tableName",
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A.attname AS "columnName",
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tc.is_nullable AS "nullable",
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concat_ws ( '', t.typname, SUBSTRING ( format_type ( a.atttypid, a.atttypmod ) FROM '\(.*\)' ) ) AS "columnType",
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(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",
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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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JOIN information_schema.columns tc ON tc.column_name = a.attname AND tc.table_name = C.relname AND tc.table_schema = pn.nspname
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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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`
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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, err := pm.di.innerSelect(PGSQL_TABLE_MA)
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biz.ErrIsNilAppendErr(err, "获取表基本信息失败: %s")
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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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tableName := ""
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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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result, err := pm.di.innerSelect(fmt.Sprintf(PGSQL_COLUMN_MA, tableName))
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biz.ErrIsNilAppendErr(err, "获取数据库列信息失败: %s")
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return result
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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, err := pm.di.innerSelect(PGSQL_TABLE_INFO)
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biz.ErrIsNilAppendErr(err, "获取表信息失败: %s")
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return res
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}
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// 获取所有Schema
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func (pm *PgsqlMetadata) GetSchemas() ([]string, []map[string]interface{}, error) {
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return pm.di.SelectData("SELECT schema_name FROM information_schema.schemata")
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}
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