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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Dtf.WindowsInstaller
{
using System;
using System.Text;
using System.Collections.Generic;
using System.Collections.ObjectModel;
/// <summary>
/// Defines a table in an installation database.
/// </summary>
public class TableInfo
{
private string name;
private ColumnCollection columns;
private ReadOnlyCollection<string> primaryKeys;
/// <summary>
/// Creates a table definition.
/// </summary>
/// <param name="name">Name of the table.</param>
/// <param name="columns">Columns in the table.</param>
/// <param name="primaryKeys">The primary keys of the table.</param>
public TableInfo(string name, ICollection<ColumnInfo> columns, IList<string> primaryKeys)
{
if (String.IsNullOrEmpty(name))
{
throw new ArgumentNullException("name");
}
if (columns == null || columns.Count == 0)
{
throw new ArgumentNullException("columns");
}
if (primaryKeys == null || primaryKeys.Count == 0)
{
throw new ArgumentNullException("primaryKeys");
}
this.name = name;
this.columns = new ColumnCollection(columns);
this.primaryKeys = new List<string>(primaryKeys).AsReadOnly();
foreach (string primaryKey in this.primaryKeys)
{
if (!this.columns.Contains(primaryKey))
{
throw new ArgumentOutOfRangeException("primaryKeys");
}
}
}
internal TableInfo(Database db, string name)
{
if (db == null)
{
throw new ArgumentNullException("db");
}
if (String.IsNullOrEmpty(name))
{
throw new ArgumentNullException("name");
}
this.name = name;
using (View columnsView = db.OpenView("SELECT * FROM `{0}`", name))
{
this.columns = new ColumnCollection(columnsView);
}
this.primaryKeys = new ReadOnlyCollection<string>(
TableInfo.GetTablePrimaryKeys(db, name));
}
/// <summary>
/// Gets the name of the table.
/// </summary>
public string Name
{
get
{
return this.name;
}
}
/// <summary>
/// Gets information about the columns in this table.
/// </summary>
/// <remarks><p>
/// This property queries the database every time it is called,
/// to ensure the returned values are up-to-date. For best performance,
/// hold onto the returned collection if using it more than once.
/// </p></remarks>
public ColumnCollection Columns
{
get
{
return this.columns;
}
}
/// <summary>
/// Gets the names of the columns that are primary keys of the table.
/// </summary>
public IList<string> PrimaryKeys
{
get
{
return this.primaryKeys;
}
}
/// <summary>
/// Gets an SQL CREATE string that can be used to create the table.
/// </summary>
public string SqlCreateString
{
get
{
StringBuilder s = new StringBuilder("CREATE TABLE `");
s.Append(this.name);
s.Append("` (");
int count = 0;
foreach (ColumnInfo col in this.Columns)
{
if (count > 0)
{
s.Append(", ");
}
s.Append(col.SqlCreateString);
count++;
}
s.Append(" PRIMARY KEY ");
count = 0;
foreach (string key in this.PrimaryKeys)
{
if (count > 0)
{
s.Append(", ");
}
s.AppendFormat("`{0}`", key);
count++;
}
s.Append(')');
return s.ToString();
}
}
/// <summary>
/// Gets an SQL INSERT string that can be used insert a new record into the table.
/// </summary>
/// <remarks><p>
/// The values are expressed as question-mark tokens, to be supplied by the record.
/// </p></remarks>
public string SqlInsertString
{
get
{
StringBuilder s = new StringBuilder("INSERT INTO `");
s.Append(this.name);
s.Append("` (");
int count = 0;
foreach (ColumnInfo col in this.Columns)
{
if (count > 0)
{
s.Append(", ");
}
s.AppendFormat("`{0}`", col.Name);
count++;
}
s.Append(") VALUES (");
while (count > 0)
{
count--;
s.Append("?");
if (count > 0)
{
s.Append(", ");
}
}
s.Append(')');
return s.ToString();
}
}
/// <summary>
/// Gets an SQL SELECT string that can be used to select all columns of the table.
/// </summary>
/// <remarks><p>
/// The columns are listed explicitly in the SELECT string, as opposed to using "SELECT *".
/// </p></remarks>
public string SqlSelectString
{
get
{
StringBuilder s = new StringBuilder("SELECT ");
int count = 0;
foreach (ColumnInfo col in this.Columns)
{
if (count > 0) s.Append(", ");
s.AppendFormat("`{0}`", col.Name);
count++;
}
s.AppendFormat(" FROM `{0}`", this.Name);
return s.ToString();
}
}
/// <summary>
/// Gets a string representation of the table.
/// </summary>
/// <returns>The name of the table.</returns>
public override string ToString()
{
return this.name;
}
private static IList<string> GetTablePrimaryKeys(Database db, string table)
{
if (table == "_Tables")
{
return new string[] { "Name" };
}
else if (table == "_Columns")
{
return new string[] { "Table", "Number" };
}
else if (table == "_Storages")
{
return new string[] { "Name" };
}
else if (table == "_Streams")
{
return new string[] { "Name" };
}
else
{
int hrec;
uint ret = RemotableNativeMethods.MsiDatabaseGetPrimaryKeys(
(int) db.Handle, table, out hrec);
if (ret != 0)
{
throw InstallerException.ExceptionFromReturnCode(ret);
}
using (Record rec = new Record((IntPtr) hrec, true, null))
{
string[] keys = new string[rec.FieldCount];
for (int i = 0; i < keys.Length; i++)
{
keys[i] = rec.GetString(i + 1);
}
return keys;
}
}
}
}
}
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