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reader.go
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/
reader.go
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package sqlserver
import (
"database/sql"
"fmt"
"strings"
"github.com/xo/usql/drivers"
"github.com/xo/usql/drivers/metadata"
infos "github.com/xo/usql/drivers/metadata/informationschema"
)
type metaReader struct {
metadata.LoggingReader
limit int
}
var _ metadata.CatalogReader = &metaReader{}
var _ metadata.IndexReader = &metaReader{}
var _ metadata.IndexColumnReader = &metaReader{}
func NewReader(db drivers.DB, opts ...metadata.ReaderOption) metadata.Reader {
ir := infos.New(
infos.WithPlaceholder(placeholder),
infos.WithIndexes(false),
infos.WithSequences(false),
infos.WithConstraints(false),
infos.WithCustomClauses(map[infos.ClauseName]string{
infos.FunctionsSecurityType: "''",
}),
infos.WithSystemSchemas([]string{
"db_accessadmin",
"db_backupoperator",
"db_datareader",
"db_datawriter",
"db_ddladmin",
"db_denydatareader",
"db_denydatawriter",
"db_owner",
"db_securityadmin",
"INFORMATION_SCHEMA",
"sys",
}),
infos.WithCurrentSchema("schema_name()"),
infos.WithDataTypeFormatter(dataTypeFormatter),
infos.WithUsagePrivileges(false),
)(db, opts...)
mr := &metaReader{
LoggingReader: metadata.NewLoggingReader(db, opts...),
}
return metadata.NewPluginReader(ir, mr)
}
func dataTypeFormatter(col metadata.Column) string {
switch col.DataType {
case "numeric", "decimal":
if col.ColumnSize == 18 && col.DecimalDigits == 0 {
return col.DataType
} else {
return fmt.Sprintf("%s(%d,%d)", col.DataType, col.ColumnSize, col.DecimalDigits)
}
case "datetimeoffset", "datetime2", "time":
if col.ColumnSize == 7 {
return col.DataType
} else {
return fmt.Sprintf("%s(%d)", col.DataType, col.ColumnSize)
}
case "char", "nchar", "binary":
if col.ColumnSize == 1 {
return col.DataType
} else {
return fmt.Sprintf("%s(%d)", col.DataType, col.ColumnSize)
}
case "varchar", "nvarchar", "varbinary":
if col.ColumnSize == -1 {
return col.DataType + "(max)"
} else if col.ColumnSize == 1 {
return col.DataType
} else {
return fmt.Sprintf("%s(%d)", col.DataType, col.ColumnSize)
}
default:
return col.DataType
}
}
func (r *metaReader) SetLimit(l int) {
r.limit = l
}
func (r metaReader) Catalogs(metadata.Filter) (*metadata.CatalogSet, error) {
qstr := `SELECT name
FROM sys.databases`
rows, closeRows, err := r.query(qstr, []string{}, "name")
if err != 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) Indexes(f metadata.Filter) (*metadata.IndexSet, error) {
qstr := `
SELECT
db_name(),
s.name,
t.name,
COALESCE(i.name, ''),
CASE WHEN i.is_primary_key = 1 THEN 'YES' ELSE 'NO' END,
CASE WHEN i.is_unique = 1 THEN 'YES' ELSE 'NO' END,
i.type_desc
FROM sys.schemas s
JOIN sys.tables t on t.schema_id = s.schema_id
JOIN sys.indexes i ON i.object_id = t.object_id
`
conds := []string{}
vals := []interface{}{}
if f.OnlyVisible {
conds = append(conds, "s.name = schema_name()")
}
if !f.WithSystem {
conds = append(conds, "s.name NOT IN ('db_accessadmin', 'db_backupoperator', 'db_datareader', 'db_datawriter', 'db_ddladmin', 'db_denydatareader', 'db_denydatawriter', 'db_owner', 'db_securityadmin', 'INFORMATION_SCHEMA', 'sys')")
}
if f.Schema != "" {
vals = append(vals, f.Schema)
conds = append(conds, fmt.Sprintf("s.name LIKE @p%d", len(vals)))
}
if f.Parent != "" {
vals = append(vals, f.Parent)
conds = append(conds, fmt.Sprintf("t.name LIKE @p%d", len(vals)))
}
if f.Name != "" {
vals = append(vals, f.Name)
conds = append(conds, fmt.Sprintf("i.name LIKE @p%d", len(vals)))
}
rows, closeRows, err := r.query(qstr, conds, "s.name, t.name, i.name", vals...)
if err != nil {
return nil, err
}
defer closeRows()
results := []metadata.Index{}
for rows.Next() {
rec := metadata.Index{}
err = rows.Scan(&rec.Catalog, &rec.Schema, &rec.Table, &rec.Name, &rec.IsUnique, &rec.IsPrimary, &rec.Type)
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
db_name(),
s.name,
t.name,
COALESCE(i.name, ''),
c.name,
t.name,
ic.key_ordinal
FROM sys.schemas s
JOIN sys.tables t on t.schema_id = s.schema_id
JOIN sys.indexes i ON i.object_id = t.object_id
JOIN sys.index_columns ic ON i.object_id = ic.object_id and i.index_id = ic.index_id
JOIN sys.columns c ON ic.object_id = c.object_id and ic.column_id = c.column_id
JOIN sys.types ty ON ty.user_type_id = c.user_type_id
`
conds := []string{}
vals := []interface{}{}
if f.OnlyVisible {
conds = append(conds, "s.name = schema_name()")
}
if !f.WithSystem {
conds = append(conds, "s.name NOT IN ('db_accessadmin', 'db_backupoperator', 'db_datareader', 'db_datawriter', 'db_ddladmin', 'db_denydatareader', 'db_denydatawriter', 'db_owner', 'db_securityadmin', 'INFORMATION_SCHEMA', 'sys')")
}
if f.Schema != "" {
vals = append(vals, f.Schema)
conds = append(conds, fmt.Sprintf("s.name LIKE @p%d", len(vals)))
}
if f.Parent != "" {
vals = append(vals, f.Parent)
conds = append(conds, fmt.Sprintf("t.name LIKE @p%d", len(vals)))
}
if f.Name != "" {
vals = append(vals, f.Name)
conds = append(conds, fmt.Sprintf("i.name LIKE @p%d", len(vals)))
}
rows, closeRows, err := r.query(qstr, conds, "s.name, t.name, i.name, ic.index_column_id", vals...)
if err != nil {
return nil, err
}
defer closeRows()
results := []metadata.IndexColumn{}
for rows.Next() {
rec := metadata.IndexColumn{}
err = rows.Scan(&rec.Catalog, &rec.Schema, &rec.Table, &rec.IndexName, &rec.Name, &rec.DataType, &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) query(qstr string, conds []string, order string, vals ...interface{}) (*sql.Rows, func(), error) {
if len(conds) != 0 {
qstr += "\nWHERE " + strings.Join(conds, " AND ")
}
if order != "" {
qstr += "\nORDER BY " + order
}
if r.limit != 0 {
qstr += fmt.Sprintf("\nFETCH FIRST %d ROWS ONLY", r.limit)
}
return r.Query(qstr, vals...)
}