I have a simple question about the PreparedStatement on Oracle NoSql Java SDK:
What is the issue with this code? What is the right query to bind the runtime param from PreparedStatement?
String sql = "SELECT * FROM property WHERE id= ?";
QueryRequest qr = new QueryRequest();
PrepareRequest prepareRequest = new PrepareRequest().setStatement(sql);
PrepareResult prepareResult = getHandler().prepare(prepareRequest);
PreparedStatement preparedStatement = prepareResult.getPreparedStatement();
preparedStatement.setVariable(1, new StringValue("1971ba5d8babbd167448fba5f70584f1"));
My understanding is that the "?" syntax is not yet supported.
You need to declare the query as follows
String sql = "declare $id string; select * from property where id = $id";
and then set the variable using the name and not the position
preparedStatement.setVariable("$id", new StringValue("1971ba5d8babbd167448fba5f70584f1"));
Related
I have a Spring boot application. I need a feature to dynamically query the stored procedure. What I mean by dynamically,
#NamedNativeQuery(name = "getCustomFoo", query = "select * from SP_FOO_CUSTOM where id = 1", resultClass = Foo.class)
but id could be any attribute in result set, so it could change based on the users input;
#NamedNativeQuery(name = "getCustomFoo", query = "select * from SP_FOO_CUSTOM where fooid = 1 ", resultClass = Foo.class)
Is it possible to do something like this? or this is totally out of standards?
I have several records that all need to be updated to the same value. If I was just using ADO.NET I could just call a stored procedure that updated them all at one ...
UPDATE myTable
SET myColumn = "XXXXXX"
WHERE filterColumn == 'YYY'
But since I am using Entity Framework I am wondering if their was a similar way to update a set of records at once without having to loop through each of the values and set them individually? Currently I am using..
from s in myTables
where s.filterColumn == 'YYY'
select s;
var results = s.ToList();
foreach (i in results){
s.myColumn = "XXXXXX"
}
Is there a way to set the values all at once as in SQL?
I am using Entity Framework v6.1
You can still execute sql command when using Entity Framework. Here is how to do it.
dbContext.Database.Connection.Open();
var cmd = dbContext.Database.Connection.CreateCommand();
cmd.CommandText = #"UPDATE myTable
SET myColumn = #myColumn
WHERE filterColumn = #filterColumn";
cmd.Parameters.Add(new SqlParameter("myColumn", "XXXXXX"));
cmd.Parameters.Add(new SqlParameter("filterColumn", "YYY"));
cmd.ExecuteNonQuery();
The Entity Framework Extended Library includes batch update / delete functionality:
https://github.com/loresoft/EntityFramework.Extended
myTables.Update(
s => s.filterColumn == "YYY",
s => s.myColumn = "XXXXXX");
NB: This currently only supports SQL Server and SQL CE, although there is a pull request to add MySQL support.
I've got a table in my Google Cloud SQL database with an auto-incrementing column.
How do I execute an INSERT query via google-apps-script/JDBC and get back the value for the newly incremented column?
For example, my column is named ticket_id. I want to INSERT and have the new ticket_id value be returned in the result set.
In other words, if I have the following structure, what would I need to modify or how, so that I can do something like rs = stmt.getGeneratedKeys();
var conn = Jdbc.getCloudSqlConnection("jdbc:google:rdbms:.......
var stmt = conn.createStatement();
//build my INSERT sql statement
var sql = "insert into ......
var rs = stmt.executeUpdate(sql);
I see that there is a JDBC statement class with a member called RETURN_GENERATED_KEYS but I have so far not been smart enough to figure out how to properly manipulate that and get what I need. Is RETURN_GENERATED_KEYS a constant, is it an attribute, or how can I make use of it?
It seems like the documentation with the Apps Script JDBC service is a bit lacking. I've created an internal task item for that. Thankfully, Apps Script JDBC API follows the Java JDBC API pretty closely. The key is to get the result set back using the stmt.getGeneratedKeys() call.
I built a sample table using the animals example from the MySQL docs and this sample below works nicely against that and logs the next incremented ID.
function foo() {
var conn = Jdbc.getCloudSqlConnection("jdbc:google:rdbms://<instance>/<db>");
var stmt = conn.createStatement();
var sql = "INSERT INTO animals (name) VALUES ('dog')";
var count = stmt.executeUpdate(sql,1)//pass in any int for auto inc IDs back
var rs = stmt.getGeneratedKeys();
//if you are only expecting one row back, no need for while loop
// just do rs.next();
while(rs.next()) {
Logger.log(rs.getString(1));
}
rs.close();
stmt.close();
conn.close();
}
I need to enumerate the tables in a Derby (aka Java DB) database using JDBC in a Java program. All I am aware of for doing this is the SHOW TABLES command.
I first tried with something similar to this...
String strConnectionURL = "jdbc:derby:/path/to/derby/database;create=false";
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
Connection connection = DriverManager.getConnection(strConnectionURL);
Statement statement = connection.createStatement();
boolean boResult = statement.execute("SHOW TABLES");
if (boResult) {
System.out.println("yay!");
}
...but that throws an exception:
java.sql.SQLSyntaxErrorException: Syntax error: Encountered "SHOW" at line 1, column 1.
So next I thought maybe I needed to use a CallableStatement so I tried this...
String strConnectionURL = "jdbc:derby:/path/to/derby/db;create=false";
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
Connection connection = DriverManager.getConnection(strConnectionURL);
CallableStatement statement = connection.prepareCall("SHOW TABLES");
boolean boResult = statement.execute();
if (boResult) {
System.out.println("yippee!");
}
...but that throws the same exception:
java.sql.SQLSyntaxErrorException: Syntax error: Encountered "SHOW" at line 1, column 1.
So, can anyone help me enumerate the tables in my Derby (Java DB) database from JDBC?
EDIT: I'm looking around and starting to get a feeling this may be a general JDBC question. In other words, one could/would enumerate all a db's tables with the DatabaseMetaData object that can be retrieved from the Connection object. Looking into that (and looking forward to responses)...
EDIT 2: I found a pure JDBC solution, but am still happy to hear alternatives...
String strConnectionURL = "jdbc:derby:/path/to/db;create=false";
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
Connection connection = DriverManager.getConnection(strConnectionURL);
DatabaseMetaData dbmd = connection.getMetaData();
ResultSet resultSet = dbmd.getTables(null, null, null, null);
while (resultSet.next()) {
String strTableName = resultSet.getString("TABLE_NAME");
System.out.println("TABLE_NAME is " + strTableName);
}
Show Tables is an ij command, not a base SQL statement, so you can't directly execute it. As you noted in your "EDIT 2", you can use the DatabaseMetaData to do this. Two other ways to do it are: you can select from the system catalogs (see http://db.apache.org/derby/docs/10.8/ref/rrefsistabs24269.html) , or you can use the "ij.runScript" method to run the ij tool from within your program, and pass it the "show tables" command (see http://db.apache.org/derby/docs/10.8/publishedapi/jdbc3/org/apache/derby/tools/ij.html)
As Bryan suggested ij.runScript - the code would look like this:
public void showTbls() throws Exception{
String sqlIn = "SHOW TABLES;";
InputStream stream = new ByteArrayInputStream(sqlIn.getBytes(StandardCharsets.UTF_8));
ij.runScript(conn,stream,StandardCharsets.UTF_8.name(), System.out,"UTF-8");
stream.close();
}
assumming conn is a opened derby Connection
But the disadvantage is that you are getting only string output. Not an ResultSet as you would get from:
Statement stmt = conn.createStatement();
ResultSet results = stmt.executeQuery("SELECT * FROM sys.systables");
or if you want only user table names you can use following SQL:
ResultSet results = stmt.executeQuery("SELECT TABLENAME FROM SYS.SYSTABLES WHERE TABLETYPE='T'");
A very similar output to
SHOW TABLES;
can be produced by using the following jdbc compliant query:
SELECT TABLENAME, (SELECT SCHEMANAME
FROM SYS.SYSSCHEMAS
WHERE SYS.SYSTABLES.SCHEMAID = SYS.SYSSCHEMAS.SCHEMAID)
AS SCHEMANAME
FROM SYS.SYSTABLES WHERE TABLETYPE='T'
It also shows you the probably useful SCHEMA information for each TABLE entry. Skip
TABLETYPE='T'
if you also want to see the system tables of your database as the user before has mentioned already.
Is it possible to generate arbitrary where condtions SQL query through Jdbc template:
example:
If i pass value for 1 parameter (only name) : search by name
"select * from address where shopname = ?";
If i pass value for 2 parameter (name and city) - search by shopname and city:
"select * from address where shopname = ? and city = ?";
I have mupliple search fields. 7 fields. If user enters any combination. i have search only based on parameter. How to dynamically pass the parameters to the sql. Need snippet/Example how to achieve this.
What you want is some sort of criteria building api, which Hibernate has. Unfortunately, I don't think Spring's JdbcTemplate has any such facility. Others will correct me if I'm wrong...
Though as some guys already suggested that Hibernate is the best way of doing this, but still i think you can try this approach-
String sql = "select * from address where 1 = 1";
if(shopname != null)
sql += "and shopname = :shopname";
if(city!= null)
sql += "and city = :city";
and so on..and use NamedParameterJdbcTemplate
Spring Data and Hibernate have that kind of functionality. Though it might not be worth dragging in such big framework for your app.
You can try to check out SimpleJdbcInsert
http://docs.spring.io/spring/docs/current/spring-framework-reference/html/jdbc.html
Edit:
Alternatively you can try to fix it in SQL with checking on empty, but if you have lots of data to go through, this technique will slow down your request.
"select * from address
where (shopname = ? or shopname = null)
and (city = ? or city = null)";
If Scala is an option to you, the query could be constructed with something like this:
case class Search(shopname:String, city:String = None) {
def sql = "select * from address where shopname = '"+shopname+"'" + city.map(" and city = '"+
_ +"'").getOrElse("")
}
Example usage:
Search("lloh").sql
Search("lloh", Some("Austin")).sql