数据源

apps/visual/driver/mysql_meta.go

@@ -0,0 +1,118 @@
+package driver
+
+import (
+	"database/sql"
+	"fmt"
+	"github.com/XM-GO/PandaKit/biz"
+	"log"
+	"pandax/apps/visual/entity"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+func getMysqlDB(d *entity.VisualDataSource) (*sql.DB, error) {
+	// SSH Conect
+	// 设置dataSourceName  -> 更多参数参考：https://github.com/go-sql-driver/mysql#dsn-data-source-name
+	dsn := fmt.Sprintf("%s:%s@%s(%s:%d)/%s?timeout=8s",
+		d.Db.Username, d.Db.Password, "tcp", d.Db.Host, d.Db.Port, d.Db.Dbname)
+	if d.Db.Config != "" {
+		dsn = fmt.Sprintf("%s&%s", dsn, d.Db.Config)
+	}
+	log.Println(dsn)
+	return sql.Open("mysql", dsn)
+}
+
+// ---------------------------------- mysql元数据 -----------------------------------
+const (
+	// mysql 表信息元数据
+	MYSQL_TABLE_MA = `SELECT table_name tableName, table_comment tableComment from information_schema.tables WHERE table_schema = (SELECT database())`
+
+	// mysql 表信息
+	MYSQL_TABLE_INFO = `SELECT table_name tableName, table_comment tableComment, table_rows tableRows,
+	data_length dataLength, index_length indexLength, create_time createTime 
+	FROM information_schema.tables 
+    WHERE table_schema = (SELECT database())`
+
+	// mysql 索引信息
+	MYSQL_INDEX_INFO = `SELECT index_name indexName, column_name columnName, index_type indexType, non_unique nonUnique, 
+	SEQ_IN_INDEX seqInIndex, INDEX_COMMENT indexComment
+	FROM information_schema.STATISTICS 
+	WHERE table_schema = (SELECT database()) AND table_name = '%s' ORDER BY index_name asc , SEQ_IN_INDEX asc`
+
+	// mysql 列信息元数据
+	MYSQL_COLUMN_MA = `SELECT table_name tableName, column_name columnName, column_type columnType, column_default columnDefault,
+	column_comment columnComment, column_key columnKey, extra, is_nullable nullable from information_schema.columns
+	WHERE table_schema = (SELECT database()) AND table_name in (%s) ORDER BY tableName, ordinal_position`
+)
+
+type MysqlMetadata struct {
+	di *DbInstance
+}
+
+// 获取表基础元信息, 如表名等
+func (mm *MysqlMetadata) GetTables() []map[string]interface{} {
+	res, err := mm.di.innerSelect(MYSQL_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 (mm *MysqlMetadata) 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 := mm.di.innerSelect(fmt.Sprintf(MYSQL_COLUMN_MA, tableName))
+	biz.ErrIsNilAppendErr(err, "获取数据库列信息失败: %s")
+	return result
+}
+
+// 获取表主键字段名，不存在主键标识则默认第一个字段
+func (mm *MysqlMetadata) GetPrimaryKey(tablename string) string {
+	columns := mm.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GetTableMetedatas获取更详细的表信息
+func (mm *MysqlMetadata) GetTableInfos() []map[string]interface{} {
+	res, err := mm.di.innerSelect(MYSQL_TABLE_INFO)
+	biz.ErrIsNilAppendErr(err, "获取表信息失败: %s")
+	return res
+}
+
+// 获取表索引信息
+func (mm *MysqlMetadata) GetTableIndex(tableName string) []map[string]interface{} {
+	res, err := mm.di.innerSelect(fmt.Sprintf(MYSQL_INDEX_INFO, tableName))
+	biz.ErrIsNilAppendErr(err, "获取表索引信息失败: %s")
+	// 把查询结果以索引名分组，索引字段以逗号连接
+	result := make([]map[string]interface{}, 0)
+	key := ""
+	for _, v := range res {
+		// 当前的索引名
+		in := v["indexName"].(string)
+		if key == in {
+			// 索引字段已根据名称和顺序排序，故取最后一个即可
+			i := len(result) - 1
+			// 同索引字段以逗号连接
+			result[i]["columnName"] = result[i]["columnName"].(string) + "," + v["columnName"].(string)
+		} else {
+			key = in
+			result = append(result, v)
+		}
+	}
+	return result
+}
+
+func (mm *MysqlMetadata) GetTableRecord(tableName string, pageNum, pageSize int) ([]string, []map[string]interface{}, error) {
+	return mm.di.SelectData(fmt.Sprintf("SELECT * FROM %s LIMIT %d, %d", tableName, (pageNum-1)*pageSize, pageSize))
+}