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Query optimization #312

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This commit is contained in:
kononnable 2020-12-29 23:57:44 +01:00
parent 7bbe9254eb
commit 237d31581f
1 changed files with 11 additions and 18 deletions
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29
src/drivers/MssqlDriver.ts
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@ -94,25 +94,18 @@ export default class MssqlDriver extends AbstractDriver {
IsIdentity: number;
IsUnique: number;
}[] = (
await request.query(`SELECT TABLE_NAME,TABLE_SCHEMA,COLUMN_NAME,COLUMN_DEFAULT,IS_NULLABLE,
DATA_TYPE,CHARACTER_MAXIMUM_LENGTH,NUMERIC_PRECISION,NUMERIC_SCALE,
COLUMNPROPERTY(object_id(CONCAT(TABLE_SCHEMA,'.', TABLE_NAME)), COLUMN_NAME, 'IsIdentity') IsIdentity,
(SELECT count(*)
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
inner join INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE cu
on cu.CONSTRAINT_NAME = tc.CONSTRAINT_NAME
where
tc.CONSTRAINT_TYPE = 'UNIQUE'
and tc.TABLE_NAME = c.TABLE_NAME
and cu.COLUMN_NAME = c.COLUMN_NAME
and tc.TABLE_SCHEMA=c.TABLE_SCHEMA) IsUnique
FROM INFORMATION_SCHEMA.COLUMNS c
where TABLE_SCHEMA in (${MssqlDriver.buildEscapedObjectList(
schemas
)}) AND TABLE_CATALOG in (${MssqlDriver.buildEscapedObjectList(
await request.query(`SELECT c.TABLE_NAME,c.TABLE_SCHEMA,c.COLUMN_NAME,c.COLUMN_DEFAULT,IS_NULLABLE, DATA_TYPE,CHARACTER_MAXIMUM_LENGTH,NUMERIC_PRECISION,NUMERIC_SCALE,
COLUMNPROPERTY(object_id(c.TABLE_SCHEMA + '.'+ c.TABLE_NAME),c. COLUMN_NAME, 'IsIdentity') IsIdentity,
CASE WHEN ISNULL(tc.cnt,0)>0 THEN 1 ELSE 0 END AS IsUnique
FROM INFORMATION_SCHEMA.COLUMNS c
LEFT JOIN (SELECT tc.TABLE_SCHEMA,tc.TABLE_NAME,cu.COLUMN_NAME,COUNT(1) AS cnt FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc inner join INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE cu on cu.CONSTRAINT_NAME = tc.CONSTRAINT_NAME where tc.CONSTRAINT_TYPE = 'UNIQUE' GROUP BY tc.TABLE_SCHEMA,tc.TABLE_NAME,cu.COLUMN_NAME) AS tc
on tc.TABLE_NAME = c.TABLE_NAME and tc.COLUMN_NAME = c.COLUMN_NAME and tc.TABLE_SCHEMA=c.TABLE_SCHEMA
where c.TABLE_SCHEMA in (${MssqlDriver.buildEscapedObjectList(
schemas
)}) AND c.TABLE_CATALOG in (${MssqlDriver.buildEscapedObjectList(
dbNames
)})
order by ordinal_position`)
)}) order by ordinal_position
`)
).recordset;
entities.forEach((ent) => {
response