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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
namespace System.Data.Linq.SqlClient {
using System.Data.Linq.Mapping;
using System.Data.Linq.Provider;
using System.Diagnostics.CodeAnalysis;
/// <summary>
/// Class for building up SQL DDL commands.
/// </summary>
internal static class SqlBuilder {
internal static string GetCreateDatabaseCommand(string catalog, string dataFilename, string logFilename) {
StringBuilder sb = new StringBuilder();
sb.AppendFormat("CREATE DATABASE {0}", SqlIdentifier.QuoteIdentifier(catalog));
if (dataFilename != null) {
sb.AppendFormat(" ON PRIMARY (NAME='{0}', FILENAME='{1}')", Path.GetFileName(dataFilename), dataFilename);
sb.AppendFormat(" LOG ON (NAME='{0}', FILENAME='{1}')", Path.GetFileName(logFilename), logFilename);
}
return sb.ToString();
}
internal static string GetDropDatabaseCommand(string catalog) {
StringBuilder sb = new StringBuilder();
sb.AppendFormat("DROP DATABASE {0}", SqlIdentifier.QuoteIdentifier(catalog));
return sb.ToString();
}
internal static string GetCreateSchemaForTableCommand(MetaTable table) {
StringBuilder sb = new StringBuilder();
List<string> parts = new List<string>(SqlIdentifier.GetCompoundIdentifierParts(table.TableName));
// table names look like this in Yukon (according to MSDN):
// [ database_name . [ schema_name ] . | schema_name . ] table_name
// ... which means that either way, the schema name is the second to last part.
if ((parts.Count) < 2) {
return null;
}
string schema = parts[parts.Count - 2];
if (String.Compare(schema, "DBO", StringComparison.OrdinalIgnoreCase) != 0 &&
String.Compare(schema, "[DBO]", StringComparison.OrdinalIgnoreCase) != 0) {
sb.AppendFormat("CREATE SCHEMA {0}", SqlIdentifier.QuoteIdentifier(schema));
}
return sb.ToString();
}
internal static string GetCreateTableCommand(MetaTable table) {
StringBuilder sb = new StringBuilder();
StringBuilder decl = new StringBuilder();
BuildFieldDeclarations(table, decl);
sb.AppendFormat("CREATE TABLE {0}", SqlIdentifier.QuoteCompoundIdentifier(table.TableName));
sb.Append("(");
sb.Append(decl.ToString());
decl = new StringBuilder();
BuildPrimaryKey(table, decl);
if (decl.Length > 0) {
string name = String.Format(Globalization.CultureInfo.InvariantCulture, "PK_{0}", table.TableName);
sb.Append(", ");
sb.AppendLine();
sb.AppendFormat(" CONSTRAINT {0} PRIMARY KEY ({1})", SqlIdentifier.QuoteIdentifier(name), decl.ToString());
}
sb.AppendLine();
sb.Append(" )");
return sb.ToString();
}
internal static void BuildFieldDeclarations(MetaTable table, StringBuilder sb) {
int n = 0;
Dictionary<object, string> memberNameToMappedName = new Dictionary<object, string>();
foreach (MetaType type in table.RowType.InheritanceTypes) {
n += BuildFieldDeclarations(type, memberNameToMappedName, sb);
}
if (n == 0) {
throw Error.CreateDatabaseFailedBecauseOfClassWithNoMembers(table.RowType.Type);
}
}
private static int BuildFieldDeclarations(MetaType type, Dictionary<object, string> memberNameToMappedName, StringBuilder sb) {
int n = 0;
foreach (MetaDataMember mm in type.DataMembers) {
// Only generate declarations for the current type.
if (mm.IsDeclaredBy(type)) {
if (!mm.IsAssociation) {
if (mm.IsPersistent) {
object dn = InheritanceRules.DistinguishedMemberName(mm.Member);
string mappedName;
if (memberNameToMappedName.TryGetValue(dn, out mappedName)) {
if (mappedName == mm.MappedName) {
continue;
}
}
else {
memberNameToMappedName.Add(dn, mm.MappedName);
}
if (sb.Length > 0) {
sb.Append(", ");
}
sb.AppendLine();
sb.Append(string.Format(Globalization.CultureInfo.InvariantCulture, " {0} ", SqlIdentifier.QuoteCompoundIdentifier(mm.MappedName)));
if (!string.IsNullOrEmpty(mm.Expression)) {
// Generate "AS <expression>" for computed columns
sb.Append("AS " + mm.Expression);
}
else {
sb.Append(GetDbType(mm));
}
n++;
}
}
}
}
return n;
}
private static void BuildPrimaryKey(MetaTable table, StringBuilder sb) {
foreach (MetaDataMember mm in table.RowType.IdentityMembers) {
if (sb.Length > 0) {
sb.Append(", ");
}
sb.Append(SqlIdentifier.QuoteCompoundIdentifier(mm.MappedName));
}
}
private static string BuildKey(IEnumerable<MetaDataMember> members) {
StringBuilder sb = new StringBuilder();
foreach (MetaDataMember mm in members) {
if (sb.Length > 0) {
sb.Append(", ");
}
sb.Append(SqlIdentifier.QuoteCompoundIdentifier(mm.MappedName));
}
return sb.ToString();
}
internal static IEnumerable<String> GetCreateForeignKeyCommands(MetaTable table) {
foreach (MetaType type in table.RowType.InheritanceTypes) {
foreach (string command in GetCreateForeignKeyCommands(type)) {
yield return command;
}
}
}
private static IEnumerable<String> GetCreateForeignKeyCommands(MetaType type) {
string tableName = type.Table.TableName;
foreach (MetaDataMember mm in type.DataMembers) {
if (mm.IsDeclaredBy(type) && mm.IsAssociation) {
MetaAssociation assoc = mm.Association;
if (assoc.IsForeignKey) {
StringBuilder sb = new StringBuilder();
string thisKey = BuildKey(assoc.ThisKey);
string otherKey = BuildKey(assoc.OtherKey);
string otherTable = assoc.OtherType.Table.TableName;
string name;
name = mm.MappedName;
if (name == mm.Name) {
name = String.Format(Globalization.CultureInfo.InvariantCulture, "FK_{0}_{1}", tableName, mm.Name);
}
string cmd = "ALTER TABLE {0}" + Environment.NewLine + " ADD CONSTRAINT {1} FOREIGN KEY ({2}) REFERENCES {3}({4})";
//In DLinq we put the constraint on the child object (which triggers the behavior when deleted),
//but in SQL it is part of the parent constraint (the parent row gets changed / deleted to satisfy the constraint)
MetaDataMember otherMember = mm.Association.OtherMember;
if (otherMember != null) {
string delConstr = otherMember.Association.DeleteRule;
if (delConstr != null) {
cmd += Environment.NewLine + " ON DELETE " + delConstr;
}
}
sb.AppendFormat(cmd,
SqlIdentifier.QuoteCompoundIdentifier(tableName),
SqlIdentifier.QuoteIdentifier(name),
SqlIdentifier.QuoteCompoundIdentifier(thisKey),
SqlIdentifier.QuoteCompoundIdentifier(otherTable),
SqlIdentifier.QuoteCompoundIdentifier(otherKey));
yield return sb.ToString();
}
}
}
}
[SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification="These issues are related to our use of if-then and case statements for node types, which adds to the complexity count however when reviewed they are easy to navigate and understand.")]
private static string GetDbType(MetaDataMember mm) {
string dbType = mm.DbType;
if (dbType != null) return dbType;
StringBuilder sb = new StringBuilder();
Type type = mm.Type;
bool isNullable = mm.CanBeNull;
if (type.IsValueType && IsNullable(type)) {
type = type.GetGenericArguments()[0];
}
if (mm.IsVersion) {
sb.Append("Timestamp");
}
else {
if (mm.IsPrimaryKey && mm.IsDbGenerated) {
switch (Type.GetTypeCode(type)) {
case TypeCode.Byte:
sb.Append("TinyInt");
break;
case TypeCode.SByte:
case TypeCode.Int16:
sb.Append("SmallInt");
break;
case TypeCode.Int32:
case TypeCode.UInt16:
sb.Append("Int");
break;
case TypeCode.Int64:
case TypeCode.UInt32:
sb.Append("BigInt");
break;
case TypeCode.UInt64:
case TypeCode.Decimal:
sb.Append("Decimal(20)");
break;
case TypeCode.Object:
if (type == typeof(Guid)) {
sb.Append("UniqueIdentifier");
} else {
throw Error.CouldNotDetermineDbGeneratedSqlType(type);
}
break;
}
}
else {
switch (Type.GetTypeCode(type)) {
case TypeCode.Boolean:
sb.Append("Bit");
break;
case TypeCode.Byte:
sb.Append("TinyInt");
break;
case TypeCode.SByte:
case TypeCode.Int16:
sb.Append("SmallInt");
break;
case TypeCode.Int32:
case TypeCode.UInt16:
sb.Append("Int");
break;
case TypeCode.Int64:
case TypeCode.UInt32:
sb.Append("BigInt");
break;
case TypeCode.UInt64:
sb.Append("Decimal(20)");
break;
case TypeCode.Decimal:
sb.Append("Decimal(29, 4)");
break;
case TypeCode.Double:
sb.Append("Float");
break;
case TypeCode.Single:
sb.Append("Real");
break;
case TypeCode.Char:
sb.Append("NChar(1)");
break;
case TypeCode.String:
sb.Append("NVarChar(4000)");
break;
case TypeCode.DateTime:
sb.Append("DateTime");
break;
case TypeCode.Object:
if (type == typeof(Guid)) {
sb.Append("UniqueIdentifier");
} else if (type == typeof(byte[])) {
sb.Append("VarBinary(8000)");
} else if (type == typeof(char[])) {
sb.Append("NVarChar(4000)");
} else if (type == typeof(DateTimeOffset)) {
sb.Append("DateTimeOffset");
} else if (type == typeof(TimeSpan)) {
sb.Append("Time");
} else {
throw Error.CouldNotDetermineSqlType(type);
}
break;
}
}
}
if (!isNullable) {
sb.Append(" NOT NULL");
}
if (mm.IsPrimaryKey && mm.IsDbGenerated) {
if (type == typeof(Guid)) {
sb.Append(" DEFAULT NEWID()");
}
else {
sb.Append(" IDENTITY");
}
}
return sb.ToString();
}
internal static bool IsNullable(Type type) {
return type.IsGenericType && typeof(Nullable<>).IsAssignableFrom(type.GetGenericTypeDefinition());
}
}
}
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