我们正在更改服务器上的数据库名称,但是数据库很大,我们想要创建一个小应用程序,它将循环遍历所有数据库,然后是数据库中的所有表,然后是所有列在表格中匹配" LIVE"。
我开始创建代码,但我觉得这样笨重并且返回错误。
SELECT *
FROM USER_OBJECTS
WHERE object_type = 'PROCEDURE'
AND object_name = 'P1'
正如您所看到的,我不确定这是否是最好的方法。代码错误:
using (SqlConnection connection = new SqlConnection(@"data source="SERVER NAME";integrated security=false;uid="USER";password="PASSWORD";"))
{
connection.Open();
SqlCommand command = new SqlCommand(@"SELECT * FROM sys.databases", connection);
SqlDataReader reader = command.ExecuteReader();
try
{
while (reader.Read())
{
_databases.Add(string.Format("{0}", reader["name"]));
}
}
finally
{
reader.Close();
}
foreach (var database in _databases)
{
using (SqlConnection tableconnection = new SqlConnection(string.Format(@"data source="SERVER NAME";initial catalog=" + database + ";integrated security=false;uid="USERNAME";password="PASSWORD";")))
{
tableconnection.Open();
SqlCommand tablecommand = new SqlCommand(@"SELECT * FROM information_schema.tables", tableconnection);
SqlDataReader readertable = tablecommand.ExecuteReader();
try
{
while (readertable.Read())
{
_tables.Add(string.Format("{0}", readertable["TABLE_NAME"]));
}
}
finally
{
readertable.Close();
}
foreach (var tables in _tables)
{
SqlCommand columncommand = new SqlCommand(string.Format(@"SELECT * FROM INFORMATION_SCHEMA.COLUMNS where TABLE_Name=" + tables, tableconnection));
SqlDataReader readercolumn = columncommand.ExecuteReader();
try
{
while (readercolumn.Read())
{
_columns.Add(string.Format("{0}", readercolumn["COLUMN_NAME"]));
}
}
finally
{
readercolumn.Close();
}
}
}
}
}
,错误是:
SqlDataReader readercolumn = columncommand.ExecuteReader();
有谁知道出了什么问题或者是一种简单的方法吗?
答案 0 :(得分:0)
您的代码
SqlCommand columncommand = new SqlCommand(string.Format(@"SELECT * FROM INFORMATION_SCHEMA.COLUMNS where TABLE_Name=" + tables, tableconnection));
语句的结尾有)),将表连接作为string.Format的参数,你不使用它,所以要么移动它,要么......
你应该:
SqlCommand columncommand = new SqlCommand(@"SELECT * FROM INFORMATION_SCHEMA.COLUMNS where TABLE_Name=" + tables, tableconnection);
答案 1 :(得分:0)
您可以将此用于您的问题:):
CREATE PROCEDURE dbo.SearchAllDatabases
@SearchTerm NVARCHAR(255) = NULL
AS
BEGIN
SET NOCOUNT ON;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
IF @SearchTerm IS NULL OR @SearchTerm NOT LIKE N'%[^%^_]%'
BEGIN
RAISERROR(N'Please enter a valid search term.', 11, 1);
RETURN;
END
CREATE TABLE #results
(
[database] SYSNAME,
[schema] SYSNAME,
[table] SYSNAME,
[column] SYSNAME,
ExampleValue NVARCHAR(1000)
);
DECLARE
@DatabaseCommands NVARCHAR(MAX) = N'',
@ColumnCommands NVARCHAR(MAX) = N'';
SELECT @DatabaseCommands = @DatabaseCommands + N'
EXEC ' + QUOTENAME(name) + '.sys.sp_executesql
@ColumnCommands, N''@SearchTerm NVARCHAR(MAX)'', @SearchTerm;'
FROM sys.databases
WHERE database_id > 4 -- non-system databases
AND[state] = 0-- online
AND user_access = 0; -- multi-user
SET @ColumnCommands = N'DECLARE @q NCHAR(1),
@SearchCommands NVARCHAR(MAX);
SELECT @q = NCHAR(39),
@SearchCommands = N''DECLARE @VSearchTerm VARCHAR(255) = @SearchTerm;'';
SELECT @SearchCommands = @SearchCommands + CHAR(10) + N''
SELECT TOP(1)
[db] = DB_NAME(),
[schema] = N'' + @q + s.name + @q + '',
[table] = N'' + @q + t.name + @q + '',
[column] = N'' + @q + c.name + @q + '',
ExampleValue = LEFT('' + QUOTENAME(c.name) + '', 1000)
FROM '' + QUOTENAME(s.name) + ''.'' + QUOTENAME(t.name) + ''
WHERE '' + QUOTENAME(c.name) + N'' LIKE @'' + CASE
WHEN c.system_type_id IN(35, 167, 175) THEN ''V''
ELSE '''' END + ''SearchTerm;''
FROM sys.schemas AS s
INNER JOIN sys.tables AS t
ON s.[schema_id] = t.[schema_id]
INNER JOIN sys.columns AS c
ON t.[object_id] = c.[object_id]
WHERE c.system_type_id IN (35, 99, 167, 175, 231, 239)
AND c.max_length >= LEN(@SearchTerm);
PRINT @SearchCommands;
EXEC sys.sp_executesql @SearchCommands,
N''@SearchTerm NVARCHAR(255)'', @SearchTerm;';
INSERT #Results
(
[database],
[schema],
[table],
[column],
ExampleValue
)
EXEC[master].sys.sp_executesql @DatabaseCommands,
N'@ColumnCommands NVARCHAR(MAX), @SearchTerm NVARCHAR(255)',
@ColumnCommands, @SearchTerm;
SELECT[Searched for] = @SearchTerm;
SELECT[database],[schema],[table],[column],ExampleValue
FROM #Results
ORDER BY[database],[schema],[table],[column];
END
GO
并像这样使用它:
exec SearchAllDatabases @SearchTerm = '%value%'
或者从代码中执行此存储过程。
using (SqlConnection connection = new SqlConnection(@"data source="SERVER NAME";integrated security=false;uid="USER";password="PASSWORD";"))
{
conn.Open();
// 1. create a command object identifying the stored procedure
SqlCommand cmd = new SqlCommand("SearchAllDatabases", conn);
// 2. set the command object so it knows to execute a stored procedure
cmd.CommandType = CommandType.StoredProcedure;
// 3. add parameter to command, which will be passed to the stored procedure
cmd.Parameters.Add(new SqlParameter("@SearchTerm", value));
cmd.ExecuteNonQuery();
}