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refactor: db元信息获取调整

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This commit is contained in:
meilin.huang
2022-10-16 11:01:45 +08:00
parent 51f116c7d2
commit 575947795a
4 changed files with 71 additions and 89 deletions
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54
server/internal/db/application/mysql_meta.go
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@@ -10,28 +10,24 @@ const (
// mysql 表信息元数据
MYSQL_TABLE_MA = `SELECT table_name tableName, engine, table_comment tableComment,
create_time createTime from information_schema.tables
WHERE table_schema = (SELECT database()) LIMIT 2000`
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()) LIMIT 2000`
WHERE table_schema = (SELECT database())`
// mysql 索引信息
MYSQL_INDEX_INFO = `SELECT index_name indexName, column_name columnName, index_type indexType,
SEQ_IN_INDEX seqInIndex, INDEX_COMMENT indexComment
FROM information_schema.STATISTICS
WHERE table_schema = (SELECT database()) AND table_name = '%s' LIMIT 500`
WHERE table_schema = (SELECT database()) AND table_name = '%s'`
// mysql 列信息元数据
MYSQL_COLUMN_MA = `SELECT table_name tableName, column_name columnName, column_type columnType,
column_comment columnComment, column_key columnKey, extra, is_nullable nullable from information_schema.columns
WHERE table_name in (%s) AND table_schema = (SELECT database()) ORDER BY tableName, ordinal_position LIMIT %d, %d`
// mysql 列信息元数据总数
MYSQL_COLOUMN_MA_COUNT = `SELECT COUNT(*) maNum from information_schema.columns
WHERE table_name in (%s) AND table_schema = (SELECT database())`
WHERE table_schema = (SELECT database()) AND table_name in (%s) ORDER BY tableName, ordinal_position`
)
type MysqlMetadata struct {
@@ -46,42 +42,16 @@ func (mm *MysqlMetadata) GetTables() []map[string]interface{} {
// 获取列元信息, 如列名等
func (mm *MysqlMetadata) GetColumns(tableNames ...string) []map[string]interface{} {
var sql, tableName string
tableName := ""
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(MYSQL_COLOUMN_MA_COUNT, tableName)
_, countRes, _ := mm.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(MYSQL_COLUMN_MA, tableName, index*DEFAULT_COLUMN_SIZE, DEFAULT_COLUMN_SIZE)
_, result, err := mm.di.SelectData(sql)
biz.ErrIsNilAppendErr(err, "获取数据库列信息失败: %s")
res = append(res, result...)
}
return res
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，默认第一个字段
@@ -95,18 +65,20 @@ func (mm *MysqlMetadata) GetPrimaryKey(tablename string) 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, _ := mm.di.SelectData(MYSQL_TABLE_INFO)
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, _ := mm.di.SelectData(fmt.Sprintf(MYSQL_INDEX_INFO, tableName))
res, err := mm.di.innerSelect(fmt.Sprintf(MYSQL_INDEX_INFO, tableName))
biz.ErrIsNilAppendErr(err, "获取表索引信息失败: %s")
return res
}
// 获取建表ddl
func (mm *MysqlMetadata) GetCreateTableDdl(tableName string) []map[string]interface{} {
_, res, _ := mm.di.SelectData(fmt.Sprintf("show create table %s ", tableName))
res, _ := mm.di.innerSelect(fmt.Sprintf("show create table %s ", tableName))
return res
}