/
metadata.go
484 lines (457 loc) · 12.3 KB
/
metadata.go
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// Package oracle provides a metadata reader
package oracle
import (
"database/sql"
"fmt"
"strings"
"github.com/xo/usql/drivers"
"github.com/xo/usql/drivers/metadata"
)
type metaReader struct {
metadata.LoggingReader
systemSchemas string
}
var _ metadata.BasicReader = &metaReader{}
var _ metadata.IndexReader = &metaReader{}
var _ metadata.IndexColumnReader = &metaReader{}
func NewReader() func(drivers.DB, ...metadata.ReaderOption) metadata.Reader {
return func(db drivers.DB, opts ...metadata.ReaderOption) metadata.Reader {
r := &metaReader{
LoggingReader: metadata.NewLoggingReader(db, opts...),
systemSchemas: "'CTXSYS', 'FLOWS_FILES', 'MDSYS', 'OUTLN', 'SYS', 'SYSTEM', 'XDB', 'XS$NULL'",
}
return r
}
}
func (r metaReader) Catalogs(metadata.Filter) (*metadata.CatalogSet, error) {
qstr := `SELECT
UPPER(Value) AS catalog
FROM v$parameter o
WHERE name = 'db_name'
UNION ALL
SELECT
db_link AS catalog
FROM dba_db_links
ORDER BY catalog
`
rows, closeRows, err := r.Query(qstr)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewCatalogSet([]metadata.Catalog{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.Catalog{}
for rows.Next() {
rec := metadata.Catalog{}
err = rows.Scan(&rec.Catalog)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewCatalogSet(results), nil
}
func (r metaReader) Schemas(f metadata.Filter) (*metadata.SchemaSet, error) {
qstr := `SELECT
username
FROM all_users
`
conds, vals := r.conditions(f, formats{
name: "username LIKE :%d",
notSchemas: "username NOT IN (%s)",
})
if len(conds) != 0 {
qstr += " WHERE " + strings.Join(conds, " AND ")
}
qstr += `
ORDER BY username`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewSchemaSet([]metadata.Schema{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.Schema{}
for rows.Next() {
rec := metadata.Schema{}
err = rows.Scan(&rec.Schema)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewSchemaSet(results), nil
}
// Tables from selected catalog (or all, if empty), matching schemas, names and types
func (r metaReader) Tables(f metadata.Filter) (*metadata.TableSet, error) {
qstr := `SELECT
o.owner AS table_schem,
o.object_name AS table_name,
o.object_type AS table_type
FROM all_objects o
`
conds, vals := r.conditions(f, formats{
schema: "o.owner LIKE %s",
notSchemas: "o.owner NOT IN (%s)",
name: "o.object_name LIKE :%d",
types: "o.object_type IN (%s)",
})
if len(conds) != 0 {
qstr += " WHERE " + strings.Join(conds, " AND ")
}
addSynonyms := false
for _, t := range f.Types {
if t == "SYNONYM" {
addSynonyms = true
}
}
if addSynonyms {
qstr += `
UNION ALL
SELECT
s.owner AS table_schem,
s.synonym_name AS table_name,
'SYNONYM' AS table_type
FROM all_synonyms s
`
conds, seqVals := r.conditions(f, formats{
schema: "s.owner LIKE %s",
notSchemas: "s.owner NOT IN (%s)",
name: "s.synonym_name LIKE :%d",
})
vals = append(vals, seqVals...)
if len(conds) != 0 {
qstr += " WHERE " + strings.Join(conds, " AND ")
}
}
qstr += `
ORDER BY table_schem, table_name, table_type`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewTableSet([]metadata.Table{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.Table{}
for rows.Next() {
rec := metadata.Table{}
err = rows.Scan(&rec.Schema, &rec.Name, &rec.Type)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewTableSet(results), nil
}
func (r metaReader) Columns(f metadata.Filter) (*metadata.ColumnSet, error) {
qstr := `SELECT
c.owner,
c.table_name,
c.column_name,
c.column_id AS ordinal_position,
c.data_type,
CASE c.nullable
WHEN 'Y' THEN 'YES'
ELSE 'NO' END AS nullable,
COALESCE(c.data_length, c.data_precision, 0),
COALESCE(c.data_scale, 0),
CASE c.data_type
WHEN 'FLOAT' THEN 2
WHEN 'NUMBER' THEN 10
ELSE 0 END AS num_prec_radix,
COALESCE(c.char_col_decl_length, 0) as char_octet_length
FROM all_tab_columns c
`
conds, vals := r.conditions(f, formats{
schema: "c.owner LIKE %s",
notSchemas: "c.owner NOT IN (%s)",
parent: "c.table_name LIKE :%d",
})
if len(conds) != 0 {
qstr += " WHERE " + strings.Join(conds, " AND ")
}
qstr += `
ORDER BY c.owner, c.table_name, c.column_id`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewColumnSet([]metadata.Column{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.Column{}
for rows.Next() {
rec := metadata.Column{}
targets := []interface{}{
&rec.Schema,
&rec.Table,
&rec.Name,
&rec.OrdinalPosition,
&rec.DataType,
&rec.IsNullable,
&rec.ColumnSize,
&rec.DecimalDigits,
&rec.NumPrecRadix,
&rec.CharOctetLength,
}
err = rows.Scan(targets...)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewColumnSet(results), nil
}
func (r metaReader) Functions(f metadata.Filter) (*metadata.FunctionSet, error) {
qstr := `SELECT
decode (b.object_type,'PACKAGE',CONCAT(CONCAT(b.object_name,'.'), a.object_name)
,b.object_name) as specific_name,
b.owner as procedure_schem,
decode (b.object_type,'PACKAGE',CONCAT(CONCAT(b.object_name,'.'), a.object_name)
,b.object_name) as procedure_name,
decode (b.object_type,'PACKAGE',decode(a.position,0,2,1,1,0),
decode(b.object_type,'PROCEDURE',1,'FUNCTION',2,0)) as procedure_type
FROM all_arguments a
JOIN all_objects b ON b.object_id = a.object_id AND a.sequence = 1
`
conds, vals := r.conditions(f, formats{
schema: "b.owner LIKE %s",
notSchemas: "b.owner NOT IN (%s)",
name: "b.object_name LIKE :%d",
types: "b.object_type IN (%s)",
})
conds = append(conds, "(b.object_type = 'PROCEDURE' OR b.object_type = 'FUNCTION' OR b.object_type = 'PACKAGE')")
qstr += " WHERE " + strings.Join(conds, " AND ")
qstr += `
ORDER BY procedure_schem, procedure_name, procedure_type`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewFunctionSet([]metadata.Function{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.Function{}
for rows.Next() {
rec := metadata.Function{}
err = rows.Scan(
&rec.SpecificName,
&rec.Schema,
&rec.Name,
&rec.Type,
)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewFunctionSet(results), nil
}
func (r metaReader) FunctionColumns(f metadata.Filter) (*metadata.FunctionColumnSet, error) {
qstr := `SELECT
a.owner as procedure_schem,
decode (b.object_type,'PACKAGE',CONCAT(CONCAT(b.object_name,'.'),a.object_name),
b.object_name) as procedure_name,
decode(a.position,0,'RETURN_VALUE',a.argument_name) as column_name,
a.position as ordinal_position,
decode(a.position,0,5,decode(a.in_out,'IN',1,'IN/OUT',2,'OUT',4)) as column_type,
a.data_type as type_name,
COALESCE(a.data_length, a.data_precision, 0) as column_size,
COALESCE(a.data_scale, 0) as decimal_digits,
COALESCE(a.radix, 0) as num_prec_radix
FROM all_objects b
JOIN all_arguments a ON b.object_id = a.object_id AND a.data_level = 0
`
conds, vals := r.conditions(f, formats{
schema: "a.owner LIKE %s",
notSchemas: "a.owner NOT IN (%s)",
parent: "b.object_name LIKE :%d",
})
conds = append(conds, "b.object_type = 'PROCEDURE' OR b.object_type = 'FUNCTION'")
qstr += " WHERE " + strings.Join(conds, " AND ")
qstr += `
ORDER BY procedure_schem, procedure_name, ordinal_position`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewFunctionColumnSet([]metadata.FunctionColumn{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.FunctionColumn{}
for rows.Next() {
rec := metadata.FunctionColumn{}
err = rows.Scan(
&rec.Schema,
&rec.FunctionName,
&rec.Name,
&rec.OrdinalPosition,
&rec.Type,
&rec.DataType,
&rec.ColumnSize,
&rec.DecimalDigits,
&rec.NumPrecRadix,
)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewFunctionColumnSet(results), nil
}
func (r metaReader) Indexes(f metadata.Filter) (*metadata.IndexSet, error) {
qstr := `SELECT
o.owner,
o.table_name,
o.index_name,
decode(o.uniqueness,'UNIQUE','NO','YES')
FROM all_indexes o
`
conds, vals := r.conditions(f, formats{
schema: "o.owner LIKE %s",
notSchemas: "o.owner NOT IN (%s)",
parent: "o.table_name LIKE :%d",
name: "o.index_name LIKE :%d",
})
if len(conds) != 0 {
qstr += " WHERE " + strings.Join(conds, " AND ")
}
qstr += `
ORDER BY o.owner, o.table_name, o.index_name`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewIndexSet([]metadata.Index{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.Index{}
for rows.Next() {
rec := metadata.Index{}
err = rows.Scan(&rec.Schema, &rec.Table, &rec.Name, &rec.IsUnique)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewIndexSet(results), nil
}
func (r metaReader) IndexColumns(f metadata.Filter) (*metadata.IndexColumnSet, error) {
qstr := `SELECT
o.owner,
o.table_name,
o.index_name,
b.column_name,
b.column_position
FROM all_indexes o
JOIN all_ind_columns b ON o.owner = b.index_owner AND o.index_name = b.index_name
`
conds, vals := r.conditions(f, formats{
schema: "o.owner LIKE %s",
notSchemas: "o.owner NOT IN (%s)",
parent: "o.table_name LIKE :%d",
name: "o.index_name LIKE :%d",
})
if len(conds) != 0 {
qstr += " WHERE " + strings.Join(conds, " AND ")
}
qstr += `
ORDER BY o.owner, o.table_name, o.index_name, b.column_position`
rows, closeRows, err := r.Query(qstr, vals...)
if err != nil {
if err == sql.ErrNoRows {
return metadata.NewIndexColumnSet([]metadata.IndexColumn{}), nil
}
return nil, err
}
defer closeRows()
results := []metadata.IndexColumn{}
for rows.Next() {
rec := metadata.IndexColumn{}
err = rows.Scan(&rec.Schema, &rec.Table, &rec.IndexName, &rec.Name, &rec.OrdinalPosition)
if err != nil {
return nil, err
}
results = append(results, rec)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return metadata.NewIndexColumnSet(results), nil
}
func (r metaReader) conditions(filter metadata.Filter, formats formats) ([]string, []interface{}) {
baseParam := 1
conds := []string{}
vals := []interface{}{}
if filter.Schema != "" && formats.schema != "" {
vals = append(vals, strings.ToUpper(filter.Schema))
conds = append(conds, fmt.Sprintf(formats.schema, fmt.Sprintf(":%d", baseParam)))
baseParam++
}
if !filter.WithSystem && formats.notSchemas != "" {
conds = append(conds, fmt.Sprintf(formats.notSchemas, r.systemSchemas))
}
if filter.OnlyVisible && formats.schema != "" {
conds = append(conds, fmt.Sprintf(formats.schema, "user"))
}
if filter.Parent != "" && formats.parent != "" {
vals = append(vals, strings.ToUpper(filter.Parent))
conds = append(conds, fmt.Sprintf(formats.parent, baseParam))
baseParam++
}
if filter.Name != "" && formats.name != "" {
vals = append(vals, strings.ToUpper(filter.Name))
conds = append(conds, fmt.Sprintf(formats.name, baseParam))
baseParam++
}
if len(filter.Types) != 0 && formats.types != "" {
pholders := []string{}
for _, t := range filter.Types {
vals = append(vals, strings.ToUpper(t))
pholders = append(pholders, fmt.Sprintf(":%d", baseParam))
baseParam++
}
if len(pholders) != 0 {
conds = append(conds, fmt.Sprintf(formats.types, strings.Join(pholders, ", ")))
}
}
return conds, vals
}
type formats struct {
schema string
notSchemas string
parent string
name string
types string
}