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SQLiteSchemaProvider.cs
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SQLiteSchemaProvider.cs
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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Data;
namespace LinqToDB.DataProvider.SQLite
{
using Common;
using Data;
using SchemaProvider;
sealed class SQLiteSchemaProvider : SchemaProviderBase
{
public override DatabaseSchema GetSchema(DataConnection dataConnection, GetSchemaOptions? options = null)
{
// TODO: Connection.GetSchema is not supported by MS provider, so we need to implement direct read of metadata
if (dataConnection.DataProvider.Name == ProviderName.SQLiteMS)
return new DatabaseSchema()
{
DataSource = string.Empty,
Database = string.Empty,
ServerVersion = string.Empty,
Tables = new List<TableSchema>(),
Procedures = new List<ProcedureSchema>(),
DataTypesSchema = new DataTable()
};
return base.GetSchema(dataConnection, options);
}
protected override List<TableInfo> GetTables(DataConnection dataConnection, GetSchemaOptions options)
{
var tables = dataConnection.Connection.GetSchema("Tables");
var views = dataConnection.Connection.GetSchema("Views");
return Enumerable
.Empty<TableInfo>()
.Concat
(
from t in tables.AsEnumerable()
where t.Field<string>("TABLE_TYPE") != "SYSTEM_TABLE"
let catalog = t.Field<string>("TABLE_CATALOG")
let schema = t.Field<string>("TABLE_SCHEMA")
let name = t.Field<string>("TABLE_NAME")
select new TableInfo
{
TableID = catalog + '.' + schema + '.' + name,
CatalogName = catalog,
SchemaName = schema,
TableName = name,
IsDefaultSchema = string.IsNullOrEmpty(schema),
}
)
.Concat(
from t in views.AsEnumerable()
let catalog = t.Field<string>("TABLE_CATALOG")
let schema = t.Field<string>("TABLE_SCHEMA")
let name = t.Field<string>("TABLE_NAME")
select new TableInfo
{
TableID = catalog + '.' + schema + '.' + name,
CatalogName = catalog,
SchemaName = schema,
TableName = name,
IsDefaultSchema = string.IsNullOrEmpty(schema),
IsView = true,
}
).ToList();
}
protected override IReadOnlyCollection<PrimaryKeyInfo> GetPrimaryKeys(DataConnection dataConnection,
IEnumerable<TableSchema> tables, GetSchemaOptions options)
{
var dbConnection = dataConnection.Connection;
var pks = dbConnection.GetSchema("IndexColumns");
var idxs = dbConnection.GetSchema("Indexes");
return
(
from pk in pks. AsEnumerable()
join idx in idxs.AsEnumerable()
on pk.Field<string>("CONSTRAINT_NAME") equals idx.Field<string>("INDEX_NAME")
where idx.Field<bool>("PRIMARY_KEY")
select new PrimaryKeyInfo
{
TableID = pk.Field<string>("TABLE_CATALOG") + "." + pk.Field<string>("TABLE_SCHEMA") + "." + pk.Field<string>("TABLE_NAME"),
PrimaryKeyName = pk.Field<string>("CONSTRAINT_NAME")!,
ColumnName = pk.Field<string>("COLUMN_NAME")!,
Ordinal = pk.Field<int> ("ORDINAL_POSITION"),
}
).ToList();
}
protected override List<ColumnInfo> GetColumns(DataConnection dataConnection, GetSchemaOptions options)
{
var cs = dataConnection.Connection.GetSchema("Columns");
return
(
from c in cs.AsEnumerable()
let tschema = c.Field<string>("TABLE_SCHEMA")
let schema = tschema == "sqlite_default_schema" ? "" : tschema
let dataType = c.Field<string>("DATA_TYPE")!.Trim()
let length = Converter.ChangeTypeTo<long>(c["CHARACTER_MAXIMUM_LENGTH"])
select new ColumnInfo
{
TableID = c.Field<string>("TABLE_CATALOG") + "." + schema + "." + c.Field<string>("TABLE_NAME"),
Name = c.Field<string>("COLUMN_NAME")!,
IsNullable = c.Field<bool> ("IS_NULLABLE"),
Ordinal = Converter.ChangeTypeTo<int> (c["ORDINAL_POSITION"]),
DataType = dataType,
Length = length > int.MaxValue ? null : (int?)length,
Precision = Converter.ChangeTypeTo<int> (c["NUMERIC_PRECISION"]),
Scale = Converter.ChangeTypeTo<int> (c["NUMERIC_SCALE"]),
IsIdentity = c.Field<bool> ("AUTOINCREMENT"),
SkipOnInsert = dataType == "timestamp",
SkipOnUpdate = dataType == "timestamp",
}
).ToList();
}
protected override IReadOnlyCollection<ForeignKeyInfo> GetForeignKeys(DataConnection dataConnection,
IEnumerable<TableSchema> tables, GetSchemaOptions options)
{
var fks = dataConnection.Connection.GetSchema("ForeignKeys");
var result =
(
from fk in fks.AsEnumerable()
where fk.Field<string>("CONSTRAINT_TYPE") == "FOREIGN KEY"
select new ForeignKeyInfo
{
Name = fk.Field<string>("CONSTRAINT_NAME" )!,
ThisTableID = fk.Field<string>("TABLE_CATALOG" ) + "." + fk.Field<string>("TABLE_SCHEMA") + "." + fk.Field<string>("TABLE_NAME"),
ThisColumn = fk.Field<string>("FKEY_FROM_COLUMN" )!,
OtherTableID = fk.Field<string>("FKEY_TO_CATALOG" ) + "." + fk.Field<string>("FKEY_TO_SCHEMA") + "." + fk.Field<string>("FKEY_TO_TABLE"),
OtherColumn = fk.Field<string>("FKEY_TO_COLUMN" )!,
Ordinal = fk.Field<int> ("FKEY_FROM_ORDINAL_POSITION"),
}
).ToList();
// Handle case where Foreign Key reference does not include a column name (Issue #784)
if (result.Any(fk => string.IsNullOrEmpty(fk.OtherColumn)))
{
var pks = GetPrimaryKeys(dataConnection, tables, options).ToDictionary(pk => string.Format(CultureInfo.InvariantCulture, "{0}:{1}", pk.TableID, pk.Ordinal), pk => pk.ColumnName);
foreach (var f in result.Where(fk => string.IsNullOrEmpty(fk.OtherColumn)))
{
var k = string.Format(CultureInfo.InvariantCulture, "{0}:{1}", f.OtherTableID, f.Ordinal);
if (pks.TryGetValue(k, out var column))
f.OtherColumn = column;
}
}
return result;
}
protected override string GetDatabaseName(DataConnection dbConnection)
{
return dbConnection.Connection.DataSource;
}
protected override DataType GetDataType(string? dataType, string? columnType, int? length, int? precision, int? scale)
{
// note that sqlite doesn't have types (it has facets) so type name will contain anything
// user specified in create table statement
// here we just map some well-known database types (non-sqlite specific) but this list
// will never be complete
return dataType switch
{
"smallint" => DataType.Int16,
"int" => DataType.Int32,
"real" => DataType.Single,
"float" => DataType.Double,
"double" => DataType.Double,
"money" => DataType.Money,
"currency" => DataType.Money,
"decimal" => DataType.Decimal,
"numeric" => DataType.Decimal,
"bit" => DataType.Boolean,
"yesno" => DataType.Boolean,
"logical" => DataType.Boolean,
"bool" => DataType.Boolean,
"boolean" => DataType.Boolean,
"tinyint" => DataType.Byte,
"integer" => DataType.Int64,
"counter" => DataType.Int64,
"autoincrement" => DataType.Int64,
"identity" => DataType.Int64,
"long" => DataType.Int64,
"bigint" => DataType.Int64,
"binary" => DataType.Binary,
"varbinary" => DataType.VarBinary,
"blob" => DataType.VarBinary,
"image" => DataType.Image,
"general" => DataType.VarBinary,
"oleobject" => DataType.VarBinary,
"object" => DataType.Variant,
"varchar" => DataType.VarChar,
"nvarchar" => DataType.NVarChar,
"memo" => DataType.Text,
"longtext" => DataType.Text,
"note" => DataType.Text,
"text" => DataType.Text,
"ntext" => DataType.NText,
"string" => DataType.Char,
"char" => DataType.Char,
"nchar" => DataType.NChar,
"datetime" => DataType.DateTime,
"datetime2" => DataType.DateTime2,
"smalldate" => DataType.SmallDateTime,
"timestamp" => DataType.Timestamp,
"date" => DataType.Date,
"time" => DataType.Time,
"uniqueidentifier" => DataType.Guid,
"guid" => DataType.Guid,
_ => DataType.Undefined,
};
}
protected override string? GetProviderSpecificTypeNamespace() => null;
protected override Type? GetSystemType(string? dataType, string? columnType, DataTypeInfo? dataTypeInfo, int? length, int? precision, int? scale, GetSchemaOptions options)
{
return dataType switch
{
"object" => typeof(object),
"datetime2" => typeof(DateTime),
_ => base.GetSystemType(dataType, columnType, dataTypeInfo, length, precision, scale, options),
};
}
}
}