SQLite metadata

http://www.devart.com/dotconnect/sqlite/docs/MetaData.html

https://github.com/sqlitebrowser/sqlitebrowser/releases/tag/v3.5.1

In this overload first parameter is name of a collection, and second parameter is the array of restrictions to be applied when querying information. These restrictions specify which subset of the collection will be returned. The restrictions can include, for example, the database name (in this case, only collection elements belonging to this database will be returned) or the mask for the name of collection elements (only the elements satisfying this mask will be returned). The quantity and description of restrictions allowed for each metadata collection are represented in the table here. Their number can also be obtained from the return of the GetSchema() method. If the second parameter is null/Nothing, it is ignored.

Instead of specifying the metadata collection name as a string constant, you may use members of System.Data.DbMetaDataCollectionNames and Devart.Data.SQLite.SQLiteMetadataCollectionNames as the first GetSchema argument values. The members of these classes are the string fields, each field stores the corresponding metadata collection name. It is recommended to use these fields rather than manually input the collection names manually as the string constants because in case of using these fields, you will find misspellings at compile-time, and intellisense will show you all the available metadata collection names.

GetSchema Method Reference

The following table provides detailed information on metadata collections that can be retrieved using the GetSchema method, and restrictions that can be applied for them. When calling the GetSchema method, you can pass all or few arguments. In the latter case, some default values are assumed, if they were not specified explicitly. The default value of catalog restriction is "main" - the currently opened database.

 

Collection Name	Number of restrictions	Remarks
Catalogs	1	Lists all connected catalogs. When restricted by name mask, returns all catalogs that match the mask.
Columns	3	Returns list of columns, their type and some extra information. The first restriction is name of a catalog that GetSchema method should search in. The second restriction is name of a table that GetSchema method should search in. At last, you can set column name pattern as described in "Tables" collection.
DatasourceInformation	0	Returns information about the data source.
DataTypes	0	Returns information about data types supported by the data source.
ForeignKeyColumns	3	Returns list of columns used by foreign keys in the catalog. Restrict it with catalog name, table name, and the foreign key name pattern.
ForeignKeys	3	Returns list of columns that participate in foreign keys. The first restriction for this collection is name of a catalog. The second restriction is table name mask. The third restriction is the key pattern.
IndexColumns	4	Returns list of indexed columns in the catalog, their type and some extra information. Restrict it with catalog name, table name, index name pattern, and column name pattern.
Indexes	3	Returns list of indexes and their details. The first restriction is catalog name The second restriction is table name. The last restriction is the index name pattern.
MetaDataCollections	0	Returns this list. Same as using GetSchema() method without parameters.
PrimaryKeys	2	Returns list of columns that participate in primary keys. The first restriction for this collection is name of a catalog. The second restriction is table name.
ReservedWords	0	Lists all reserved words used in the server.
Restrictions	0	Returns list of possible restrictions and their default values for the metadata collections.
Tables	2	GetSchema("Tables") returns list of tables in "main" catalog. The first restriction for this collection is name of a catalog. If specified, the method returns all tables within the catalog. The second restriction is table name mask. You can use wildcards '%' (any number of characters) and '_' (one character) to retrieve names of tables that match the mask.
UniqueKeys	2	Returns list of columns that participate in unique keys. The first restriction for this collection is name of a catalog. The second restriction is table name.
ViewColumns	3	Returns list of columns used by views in the catalog. Restrict it with catalog name, table name and column name.
Views	2	GetSchema("Views") returns list of views in "main" catalog. The first restriction for this collection is name of a catalog. The second restriction is view name mask.

csharp代码示例:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SQLite;
using System.Data.SQLite.Linq;
/*
 * 参考资源 塗聚文 Geovin Du  Access,DB2,Informix,MySql,Oracle,PostgreSQL,SqlCe,SQLite,SqlServer,Sybase,Firebird
 http://zetcode.com/db/sqlitecsharp/meta/
 * http://sourceforge.net/projects/sqlitemetadata/files/?source=navbar
 * http://www.codeproject.com/Tips/810596/Csharp-VB-NET-Cplusplus-CLI-Create-read-and-write
 * https://dbschemareader.codeplex.com/
 * https://github.com/sqlitebrowser/sqlitebrowser/releases/tag/v3.5.1
 * http://stackoverflow.com/questions/15207045/determining-primary-key-columns-via-getschema
 * http://www.devart.com/dotconnect/sqlite/docs/MetaData.html
 * http://www.devart.com/dotconnect/mysql/docs/MetaData.html
 * http://www.devart.com/dotconnect/sqlserver/docs/MetaData.html
 * http://www.devart.com/dotconnect/db2/docs/MetaData.html
 * http://www.devart.com/dotconnect/sqlite/docs/MetaData.html
 * http://www.devart.com/dotconnect/oracle/articles/metadata.html
 * http://www.devart.com/dotconnect/postgresql/docs/MetaData.html
 * SQL Server Schema Collections
 * https://msdn.microsoft.com/en-us/library/ms254969.aspx
 * https://msdn.microsoft.com/en-us/library/kcax58fh.aspx
 * https://support.microsoft.com/en-us/kb/318452 Excel MetaData
 * CollectionName	#	Name
Columns	1	TABLE_CATALOG
Columns	2	TABLE_SCHEMA
Columns	3	TABLE_NAME
Columns	4	COLUMN_NAME
Indexes	1	TABLE_CATALOG
Indexes	2	TABLE_SCHEMA
Indexes	3	INDEX_NAME
Indexes	4	TYPE
Indexes	5	TABLE_NAME
Procedures	1	PROCEDURE_CATALOG
Procedures	2	PROCEDURE_SCHEMA
Procedures	3	PROCEDURE_NAME
Procedures	4	PROCEDURE_TYPE
Tables	1	TABLE_CATALOG
Tables	2	TABLE_SCHEMA
Tables	3	TABLE_NAME
Tables	4	TABLE_TYPE
Views	1	TABLE_CATALOG
Views	2	TABLE_SCHEMA
Views	3	TABLE_NAME
 * 
 * 
 * MetaDataCollections集合下有:
DataSourceInformation
DataTypes
ReservedWords
Catalogs
Columns
Indexes
IndexColumns
Tables
Views
ViewColumns
ForeignKeys
Triggers
 * 
 * 
 */


namespace PayrollPrint
{
    /// <summary>
    /// SELECT name, sql FROM sqlite_master WHERE type="table" AND name = "Dom"
    /// SELECT count(*) FROM sqlite_master WHERE type = "view" AND name = "myView"
    /// 涂聚文 20150324 21:19
    /// </summary>
    public partial class SQLiteFileForm : Form
    {

        public string connectionString = "Data Source=geovindu;Version=3;Pooling=true;FailIfMissing=false;UTF8Encoding=True;";

        /// <summary>
        /// 3.8.5版本查詢
        /// </summary>
        /// <returns></returns>
        private DataTable setTables()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("id", typeof(int));
            dt.Columns.Add("name", typeof(string));
            dt.Rows.Add(1, "TABLES");//所有表包括系统表
            dt.Rows.Add(2, "Indexes");//所有有主键的表
            dt.Rows.Add(3, "IndexColumns");//有键的表及主键
            dt.Rows.Add(4, "Views");//所有视图
            dt.Rows.Add(5, "DataTypes");//字段类型
            dt.Rows.Add(6, "Columns");//表的字段
            dt.Rows.Add(7, "Catalogs");//数据库文件地址
            dt.Rows.Add(8, "DatasourceInformation");//数据库文件版本等信息
            dt.Rows.Add(9, "ForeignKeyColumns");//无效
            dt.Rows.Add(10, "ForeignKeys");//外键
            dt.Rows.Add(11, "MetaDataCollections");//MetaData集合
            dt.Rows.Add(12, "PrimaryKeys");
            dt.Rows.Add(13, "ReservedWords");
            dt.Rows.Add(14, "Restrictions");
            dt.Rows.Add(15, "UniqueKeys");
            dt.Rows.Add(16, "ViewColumns");//视图的字段
            dt.Rows.Add(17, "Triggers");
            return dt;
        }

        /// <summary>
        /// 
        /// </summary>
        public SQLiteFileForm()
        {
            InitializeComponent();
        }
        /// <summary>
        /// select * from sqlite_master where type = 'table' and name ='myTable';
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SQLiteFileForm_Load(object sender, EventArgs e)
        {
            this.comboBox1.DataSource = setTables();
            this.comboBox1.DisplayMember = "name";
            this.comboBox1.ValueMember = "id";
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            //JPEG Files (*.jpeg)|*.jpeg|PNG Files (*.png)|*.png|JPG Files (*.jpg)|*.jpg|GIF Files (*.gif)|*.gif
            openFileDialog1.FileName = "";
            openFileDialog1.Filter = "files(*.db)|*.db|files (*.*)|*.*";//|(*.xlsx)|*.xlsx Image Files(*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|All files (*.*)|*.*  txt files (*.txt)|*.txt|All files (*.*)|*.*" 
            openFileDialog1.FilterIndex = 2;
            openFileDialog1.RestoreDirectory = true;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                if (!openFileDialog1.FileName.Equals(String.Empty))
                {
                    connectionString = @"Data Source=" + openFileDialog1.FileName + ";Version=3;Pooling=true;FailIfMissing=false;UTF8Encoding=True;";
                    this.textBox1.Text = openFileDialog1.FileName;
                }
            }
        }
        /// <summary>
        /// TABLE_CATALOG,TABLE_SCHEMA,TABLE_NAME,TABLE_TYPE,TABLE_ID,TABLE_ROOTPAGE,TABLE_DEFINITION
        /// TABLE_CATALOG,TABLE_SCHEMA,TABLE_NAME,INDEX_CATALOG,INDEX_SCHEMA,INDEX_NAME,PRIMARY_KEY,UNIQUE,CLUSTERED,TYPE,FILL_FACTOR,INITIAL_SIZE,NULLS,SORT_BOOKMARKS,AUTO_UPDATE,NULL_COLLATION,ORDINAL_POSITION,COLUMN_NAME,COLUMN_GUID,COLUMN_PROPID,COLLATION,CARDINALITY,PAGES,FILTER_CONDITION,INTEGRATED,INDEX_DEFINITION

        ///IndexColumns: CONSTRAINT_CATALOG,CONSTRAINT_SCHEMA,CONSTRAINT_NAME,TABLE_CATALOG,TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,ORDINAL_POSITION,INDEX_NAME,COLLATION_NAME,SORT_MODE,CONFLICT_OPTION
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            using (SQLiteConnection conn = new SQLiteConnection(connectionString))
            {
                conn.Open();
                //http://www.devart.com/dotconnect/sqlite/docs/MetaData.html
                //Catalogs,Columns,DatasourceInformation,DataTypes,ForeignKeyColumns,ForeignKeys,IndexColumns,Indexes,MetaDataCollections,PrimaryKeys,ReservedWords,Restrictions,Tables,UniqueKeys,ViewColumns,Views

                DataTable schemaTable = conn.GetSchema(this.comboBox1.Text);//(有键的表及主键)// conn.GetSchema("Indexes");(所有有主键的表)// conn.GetSchema("TABLES");(所有表包括系统表)//Views
                dataGridView1.DataSource = schemaTable;
                this.textBox2.Text = GetColumnNames(schemaTable);
            }

        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="table"></param>
        /// <returns></returns>
        public static string GetColumnNames(System.Data.DataTable table)
        {
            if (table != null)
            {
                List<string> lstColumn = new List<string>();

                foreach (System.Data.DataColumn col in table.Columns)
                {
                    lstColumn.Add(col.ColumnName);
                }

                return String.Join(",", lstColumn.ToArray());
            }

            return string.Empty;
            //foreach (DataRow row in table.Rows)
            //{
            //    foreach (DataColumn column in table.Columns)
            //    {
            //        ColumnName = column.ColumnName;
            //        ColumnData = row[column].ToString();
            //    }
            //}
        }

　　数据库类型

smallint	System.Int16	10
int	System.Int32	11
real	System.Double	8
single	System.Single	15
float	System.Double	8
double	System.Double	8
money	System.Decimal	7
currency	System.Decimal	7
decimal	System.Decimal	7
numeric	System.Decimal	7
bit	System.Boolean	3
yesno	System.Boolean	3
logical	System.Boolean	3
bool	System.Boolean	3
boolean	System.Boolean	3
tinyint	System.Byte	2
integer	System.Int64	12
counter	System.Int64	12
autoincrement	System.Int64	12
identity	System.Int64	12
long	System.Int64	12
bigint	System.Int64	12
binary	System.Byte[]	1
varbinary	System.Byte[]	1
blob	System.Byte[]	1
image	System.Byte[]	1
general	System.Byte[]	1
oleobject	System.Byte[]	1
varchar	System.String	16
nvarchar	System.String	16
memo	System.String	16
longtext	System.String	16
note	System.String	16
text	System.String	16
ntext	System.String	16
string	System.String	16
char	System.String	16
nchar	System.String	16
datetime	System.DateTime	6
smalldate	System.DateTime	6
timestamp	System.DateTime	6
date	System.DateTime	6
time	System.DateTime	6
uniqueidentifier	System.Guid	4
guid	System.Guid	4