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Replace INFORMATION_SCHEMA with sys.tables #200

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Replace INFORMATION_SCHEMA with sys.tables #200

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100 changes: 80 additions & 20 deletions Library/Models/Database.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -939,26 +939,86 @@ from sys.tables t
private void LoadColumns(SqlCommand cm) {
//get columns
cm.CommandText = @"
select
t.TABLE_SCHEMA,
c.TABLE_NAME,
c.COLUMN_NAME,
c.DATA_TYPE,
c.ORDINAL_POSITION,
c.IS_NULLABLE,
c.CHARACTER_MAXIMUM_LENGTH,
c.NUMERIC_PRECISION,
c.NUMERIC_SCALE,
CASE WHEN COLUMNPROPERTY(OBJECT_ID(c.TABLE_SCHEMA + '.' + c.TABLE_NAME), c.COLUMN_NAME, 'IsRowGuidCol') = 1 THEN 'YES' ELSE 'NO' END AS IS_ROW_GUID_COL
from INFORMATION_SCHEMA.COLUMNS c
inner join INFORMATION_SCHEMA.TABLES t
on t.TABLE_NAME = c.TABLE_NAME
and t.TABLE_SCHEMA = c.TABLE_SCHEMA
and t.TABLE_CATALOG = c.TABLE_CATALOG
where
t.TABLE_TYPE = 'BASE TABLE'
order by t.TABLE_SCHEMA, c.TABLE_NAME, c.ORDINAL_POSITION
";
SELECT
SCHEMA_NAME(tb.schema_id) AS TABLE_SCHEMA
, tb.name AS TABLE_NAME
, c.name AS COLUMN_NAME
, CASE ca.typeName
WHEN 'sysname' THEN 'nvarchar'
ELSE ca.typeName
END AS DATA_TYPE
, c.column_id AS ORDINAL_POSITION
, CASE c.is_nullable
WHEN 1 THEN 'YES'
ELSE 'NO'
END AS IS_NULLABLE
, CASE c.max_length
WHEN -1 THEN -1
ELSE
CASE ca.typeName
WHEN 'char' THEN c.max_length
WHEN 'varchar' THEN c.max_length
WHEN 'binary' THEN c.max_length
WHEN 'varbinary' THEN c.max_length
WHEN 'nchar' THEN c.max_length / 2
WHEN 'nvarchar' THEN c.max_length / 2
WHEN 'sql_variant' THEN 0
WHEN 'sysname' THEN 128
WHEN 'hierarchyid' THEN 892
WHEN 'text' THEN 2147483647
WHEN 'ntext' THEN 2147483647
WHEN 'image' THEN 2147483647
ELSE NULL
END
END AS CHARACTER_MAXIMUM_LENGTH
, CASE ca.typeName
WHEN 'tinyint' THEN c.precision
WHEN 'smallint' THEN c.precision
WHEN 'int' THEN c.precision
WHEN 'bigint' THEN c.precision
WHEN 'float' THEN c.precision
WHEN 'real' THEN c.precision
WHEN 'decimal' THEN c.precision
WHEN 'numeric' THEN c.precision
WHEN 'smallmoney' THEN c.precision
WHEN 'money' THEN c.precision
ELSE NULL
END AS NUMERIC_PRECISION
, CAST(CASE ca.typeName
WHEN 'tinyint' THEN c.scale
WHEN 'smallint' THEN c.scale
WHEN 'int' THEN c.scale
WHEN 'bigint' THEN c.scale
WHEN 'decimal' THEN c.scale
WHEN 'numeric' THEN c.scale
WHEN 'smallmoney' THEN c.scale
WHEN 'money' THEN c.scale
ELSE NULL
END AS int) AS NUMERIC_SCALE
, CASE c.is_rowguidcol
WHEN 1 THEN 'YES'
ELSE 'NO'
END AS IS_ROW_GUID_COL
FROM sys.tables AS tb
JOIN sys.columns AS c
ON tb.object_id = c.object_id
JOIN sys.types AS t
ON c.system_type_id = t.system_type_id
AND c.user_type_id = t.user_type_id
LEFT JOIN sys.types AS st
ON t.user_type_id = 1
AND t.system_type_id = st.system_type_id
AND st.user_type_id = st.system_type_id
LEFT JOIN sys.types AS bt
ON t.is_user_defined = 1
AND bt.is_user_defined = 0
AND t.system_type_id = bt.system_type_id
CROSS APPLY
(VALUES (COALESCE(bt.name, t.name))) AS ca(typeName)
ORDER BY
TABLE_SCHEMA,
TABLE_NAME,
ORDINAL_POSITION";
using (var dr = cm.ExecuteReader()) {
LoadColumnsBase(dr, Tables);
}
Expand Down