i am using below simple query to get the result for testing purpose.
qName = "select total_requests from (select 10000 as total_requests from dual)"; //this can be dynamic query
preStatement = connection.prepareStatement(qName);
ParameterMetaData pmd = preStatement.getParameterMetaData();
int stmtCount = pmd.getParameterCount();
int paramsCount = params == null ? 0 : params.length;
for (int i = 0; i < params.length; i++) {
if (params[i] != null) {
preStatement.setObject(i + 1, params[i]);
} else {
int sqlType = Types.VARCHAR;
if (!paramValid) {
try {
sqlType = pmd.getParameterType(i + 1);
} catch (SQLException e) {
paramValid = true;
}
}
preStatement.setNull(i + 1, sqlType);
}
}
ResultSet rs = preStatement.executeQuery();
once i am executing 3rd line, below error is thrown by application
Caused by: java.lang.AbstractMethodError: com.inet.pool.b.getParameterMetaData()Ljava/sql/ParameterMetaData;
at com.core.admin.util.AnalyzeHelper.fillQuery(AnalyzeHelper.java:61)
is this due to subQuery issue?
how to resolve this?
use this for executing query
preStatement.executeQuery();
you need to have a result set for viewing
ResultSet rs=preStatement.executeQuery();
while(rs.next())
{
rs.getString(1);// I assume that first column is a String.If it is an INT then use rs.getInt(1);
//similarly for other columns
}
It may helps you.
qName = "select total_requests from (select 10000 as total_requests from dual)";
preStatement = connection.prepareStatement(qName);
ResultSet rs= preStatement.executeQuery();
Related
I want to select multiple rows and return them in an Arraylist.
My Database structure looks like this:
1 Bestellnummer int(20)
2 BestellerID int(20)
3 ArtikelNummer int(20)
4 Anzahl int(10)
5 Preis double
It doesnt have a unique key, since it will not be changed.
I wrote this Method but i get the error:
" You have an error in your SQL syntax; check the manual that
corresponds to your MariaDB server version for the right syntax to use
near 'BestellerID,ArtikelNummer,Preis FROM bestellungen WHERE
Bestellnummer = 1' at line 1Exception in thread "main"
java.lang.IndexOutOfBoundsException: Index 1 out-of-bounds for length
0"
public ArrayList<Bestellung> getBestellung (int i) throws SQLException {
ArrayList<Bestellung> Auftrag = new ArrayList<>();
final String SQL ="SELECT* BestellerID,ArtikelNummer,Preis FROM bestellungen WHERE Bestellnummer = ?" ;
ResultSet rs = null ;
try {
PreparedStatement stmt = con.prepareStatement(SQL,ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
stmt.setInt(1, i);
rs = stmt.executeQuery();
System.out.println("test");
while (rs.next()) {
Bestellung test = new Bestellung( i, rs.getInt("BestellerID"), rs.getInt("ArtikelNummer"), rs.getDouble("Preis"));
Auftrag.add(test);
}
}
catch (SQLException e) {
System.err.print(e);
}
finally {
if (rs!=null) {rs.close();
}
}
return Auftrag;
}
}
public class Bestellung {
private int Bestellnummer, BestellerID,ArtikelNummer,Anzahl;
private double Preis;
Here is the Class that Objects will be in the Arraylist:
Bestellung (int Bestellnummerin,int BestellerIDin,int ArtikelNummerin,double Preisin)
{
this.Bestellnummer = Bestellnummerin ;
this.BestellerID = BestellerIDin ;
this.ArtikelNummer = ArtikelNummerin;
this.Anzahl = 1;
this.Preis = Preisin;
}}
You can try this:
final String SQL ="SELECT BestellerID,ArtikelNummer,Preis
FROM bestellungen WHERE Bestellnummer = ?";
I'm new to java.I have a SQL Query that gives the following output
logtime 2014-09-02 16:05:10.0
BL1_data_SS_ST 2
BL2_data_SS_ST 2
BL3_data_SS_ST 2
BL4_data_SS_ST 1
BL5_data_SS_ST 0
BL6_data_SS_ST 2
/* continues till BL27_data_SS_ST */
st1_prmt_status_p45 1
beam_current 110.58
beam_energy 2500.0635
I have only one row in my output and 31 columns. I'm using Java and JSP .
EDIT
The above result is retrieved by the following method
public String[][] beamline_Status() {
int i = 0;
try {
con = getConnection();
stmt = con.createStatement();
String sql = "SELECT TOP 1 c.logtime, a.BL1_data_SS_ST,a.BL2_data_SS_ST,a.BL3_data_SS_ST,a.BL4_data_SS_ST,a.BL5_data_SS_ST,a.BL6_data_SS_ST,a.BL7_data_SS_ST,a.BL8_data_SS_ST,a.BL9_data_SS_ST,a.BL10_data_SS_ST,a.BL11_data_SS_ST, a.BL12_data_SS_ST,a.BL13_data_SS_ST,a.BL14_data_SS_ST,a.BL15_data_SS_ST,a.BL16_data_SS_ST,a.BL17_data_SS_ST,a.BL18_data_SS_ST,a.BL19_data_SS_ST,a.BL20_data_SS_ST,a.BL21_data_SS_ST,a.BL22_data_SS_ST,a.BL23_data_SS_ST,a.BL24_data_SS_ST,a.BL25_data_SS_ST,a.BL26_data_SS_ST,a.BL27_data_SS_ST,b.st1_prmt_status_p45,c.beam_current,c.beam_energy from INDUS2_BLFE.dbo.main_BLFE_status a inner join INDUS2_MSIS.dbo.main_MSIS_status b on a.logtime=b.logtime inner join INDUS2_BDS.dbo.DCCT c on b.logtime=c.logtime ORDER BY c.logtime DESC ";
stmt.executeQuery(sql);
rs = stmt.getResultSet();
while (rs.next()) {
for (int j = 0; j < 31; j++) {
a[i][j] = rs.getString(j + 1);
}
}
} catch (Exception e) {
System.out.println("\nException (String code):" + e);
} finally {
closeConnection(stmt, rs, con);
}
return a;
}
Now I wan to define a method which retrieve values from the ResultSet where column values are either 0 or 1. How to do that.
EDIT 2
I'm trying to retrieve the column values from resultset where column value is 1 by following code:-
public String[][] beam_CurrentStatus() {
int i = 0;
try
{
con = getConnection();
stmt = con.createStatement();
String sql = "SELECT TOP 1 c.logtime, a.BL1_data_SS_ST,a.BL2_data_SS_ST,a.BL3_data_SS_ST,a.BL4_data_SS_ST,a.BL5_data_SS_ST,a.BL6_data_SS_ST,a.BL7_data_SS_ST,a.BL8_data_SS_ST,a.BL9_data_SS_ST,a.BL10_data_SS_ST,a.BL11_data_SS_ST, a.BL12_data_SS_ST,a.BL13_data_SS_ST,a.BL14_data_SS_ST,a.BL15_data_SS_ST,a.BL16_data_SS_ST,a.BL17_data_SS_ST,a.BL18_data_SS_ST,a.BL19_data_SS_ST,a.BL20_data_SS_ST,a.BL21_data_SS_ST,a.BL22_data_SS_ST,a.BL23_data_SS_ST,a.BL24_data_SS_ST,a.BL25_data_SS_ST,a.BL26_data_SS_ST,a.BL27_data_SS_ST,b.st1_prmt_status_p45,c.beam_current,c.beam_energy from INDUS2_BLFE.dbo.main_BLFE_status a inner join INDUS2_MSIS.dbo.main_MSIS_status b on a.logtime=b.logtime inner join INDUS2_BDS.dbo.DCCT c on b.logtime=c.logtime ORDER BY c.logtime DESC ";
stmt.executeQuery(sql);
rs = stmt.getResultSet();
while (rs.next()) {
for (int j = 1; j < 31; j++) {
if ((rs.getString(j)) == "1")
a[i][j] = rs.getString(j + 1);
}
}
} catch (Exception e) {
System.out.println("\nException in:" + e);
} finally {
closeConnection(stmt, rs, con);
}
return a;
}
But the result I'm getting of above code is
[[Ljava.lang.String;#ea25c1
If you want entire table in the ResultSet and then obtain only the first and second column out of it you can do like:
Statement stmt=conn.createStatement();
ResultSet rs= stmt.executeQuery("select * from tableName");
rs.getInt(1); //assuming your column is of compatible type
rs.getInt(2);
or the other way is that you retrieve only the first two columns from the DB into your ResultSet
Hello and thank you for reading my post.
I have a PostgreSQL table "t" with a column "c" which type is "character varying(32)".
Values in this column look like this: "2014100605".
I am using the "MAX()" aggregate function to retrieve the maximum value in this column.
SELECT MAX(c) AS max FROM t;
In Java, if I prepare the query above, get a "resultSet" object and send it the getString("max") message, I get max = null.
If I send it the getInt("max") method instead, I get the result I'm expecting, something like "2014100605".
Is this normal behavior?
Am I really allowed to do this or is it by chance I'm getting the expected result?
Is "MAX()" actually using the lexicographical order?
Best regards.
A bit of Java code:
s_preparedSqlQuery =
"SELECT MAX(quotinv_nro) AS quotinv_nro_max "
+ "FROM imw_quotation_invoice "
+ "WHERE quotinv_type = ? "
+ "AND quotinv_nro LIKE '" + s_quotinvDate + "%'";
preparedStatement = m_connection.prepareStatement(s_preparedSqlQuery);
preparedStatement.setString(1, s_quotinvType);
resultSet = preparedStatement.executeQuery();
if(resultSet != null)
{
if(resultSet.next())
{
// s_quotinvNroMax = resultSet.getString("quotinv_nro_max");
n_quotinvNroMax = resultSet.getInt("quotinv_nro_max");
// if(s_quotinvNroMax == null)
if(n_quotinvNroMax == 0)
{
n_nbQuotinvsThisSameDate = 0;
return n_nbQuotinvsThisSameDate;
}
else
{
s_quotinvNroMax = Integer.toString(n_quotinvNroMax);
n_length = s_quotinvDate.length();
s_currentMaxNro = s_quotinvNroMax.substring(n_length - 1);
n_nbQuotinvsThisSameDate = Integer.valueOf(s_currentMaxNro);
}
}
}
If you are hitting on a unique Id column....
int maxID = 0;
Statement s2 = con.createStatement();
s2.execute("SELECT MAX(UniqueId) FROM MyTable");
ResultSet rs2 = s2.getResultSet();
if (rs2.next())
{
maxID = rs2.getInt(1);
}
If you are hitting on any other non-key column....
int maxID = 0;
Statement s2 = con.createStatement();
s2.execute("SELECT MAX(ColumnValue) FROM MyTable");
ResultSet rs2 = s2.getResultSet();
while (rs2.next())
{
maxID = rs2.getInt(1);
}
we all know we see this exception when try to bomabard the query with more than 1000 values. the maximum for the column limit is 1000.. the best possible solution is to split the query into two.guys can u suggest some possible ways of code refactoring to make my problem go away.any help would be appreciated.
we see the exception when audTypeFieldIdList are greater than 1000 values.
try {
String query = "select AUDIT_TYPE_FIELD_ID, FIELD_NAME from AUDIT_TYPE_FIELD where AUDIT_TYPE_FIELD_ID in (";
int x = 0;
for (int y = 1; y <= audTypeFieldIdList.size(); y++) {
query += audTypeFieldIdList.get(x);
if (y != audTypeFieldIdList.size()) {
query += ", ";
}
x++;
}
query += ")";
List<Long> audTypeFieldIdList, Connection connection) {
ResultSet rs = null;
Statement stmt = null;
List<AuditTypeField> audTypeFieldList = new ArrayList<AuditTypeField>();
try {
String query = "select AUDIT_TYPE_FIELD_ID, FIELD_NAME from AUDIT_TYPE_FIELD where AUDIT_TYPE_FIELD_ID in (";
int x = 0;
for (int y = 1; y <= audTypeFieldIdList.size(); y++) {
query += audTypeFieldIdList.get(x);
if (y != audTypeFieldIdList.size()) {
query += ", ";
}
x++;
}
query += ")";
stmt = connection.createStatement();
rs = stmt.executeQuery(query);
while (rs != null && rs.next()) {
AuditTypeField audTypeField = PluginSystem.INSTANCE
.getPluginInjector().getInstance(AuditTypeField.class);
audTypeField.setId(rs.getLong("AUDIT_TYPE_FIELD_ID"));
audTypeField.setName(rs.getString("FIELD_NAME"));
audTypeFieldList.add(audTypeField);
}
return audTypeFieldList;
return audTypeFieldList;
You can't use more than 1000 entries in IN clause. There are 2 solutions as mentioned below:
Use inner query to solve this issue. You can create a temporary table and use that in your IN clause.
Break it in the batch of 1000 entries using multiple IN clause separated by OR clause.
sample query:
select * from table_name
where
column_name in (V1,V2,V3,...V1000)
or
column_name in (V1001,V1002,V1003,...V2000)
...
Read more.. and see Oracle FAQ
In the below code I am copying resultset content to arraylist. First part of the wile loop i.e while(RS.next()) is returing the results but when cursor moves to
Next while loop i.e while(SR.next()) I am getting "result set is closed". Please help me where I am doing mistake.
String SSQ = "select DISTINCT S_NUMBER from OTG.S_R_VAL" +
" WHERE R_TS = (SELECT MAX(R_TS) FROM OTG.S_R_VAL) order by S_NUMBER";
String SDS = "SELECT DISTINCT S_NUMBER FROM OTG.S_R_VAL AS STG WHERE S_NUMBER NOT IN" +
"(SELECT S_NO FROM OTG.R_VAL AS REV WHERE STG.S_NUMBER = REV.S_NO )";
String SSR = "SELECT DISTINCT S_NO FROM OTG.R_VAL where S_NO != 'NULL' order by S_NO";
String SSO = "Select O_UID from OTG.OPTY where C_S_NO IN" +
"( SELECT DISTINCT S_NUMBER FROM OTG.S_R_VAL AS STG WHERE S_NUMBER NOT IN(SELECT S_NO FROM OTG.R_VAL AS REV WHERE STG.S_NUMBER = REV.S_NO ))";
//Statement statement;
try {
connection = DatabaseConnection.getCon();
statement = connection.createStatement();
statement1 = connection.createStatement();
statement2 = connection.createStatement();
statement3 = connection.createStatement();
statement4 = connection.createStatement();
ResultSet RS = statement1.executeQuery(selectQuery);
ResultSet DS = statement2.executeQuery(Distinct_SiebelNo);
ResultSet SR = statement3.executeQuery(SiebelNo_Rev);
ResultSet SO = statement4.executeQuery(selected_OppId);
ArrayList<String> RSList = new ArrayList<String>();
ArrayList<String> SRList = new ArrayList<String>();
/* ResultSetMetaData resultSetMetaData = RS.getMetaData();
int count = resultSetMetaData.getColumnCount();*/
int count=1;
System.out.println("******count********"+count);
while(RS.next()) {
int i = 1;
count=1;
while(i < count)
{
RSList.add(RS.getString(i++));
}
System.out.println(RS.getString("SIEBEL_NUMBER"));
RSList.add( RS.getString("SIEBEL_NUMBER"));
}
/* ResultSetMetaData resultSetMetaData1 = SR.getMetaData();
int count1 = resultSetMetaData1.getColumnCount();*/
int count1=1;
while(SR.next()) {
int i = 1;
while(i < count1)
{
SRList.add(SR.getString(i++));
}
System.out.println(SR.getString("SIEBEL_NO"));
SRList.add( SR.getString("SIEBEL_NO"));
}SR.close();
connection.commit();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
The logic of each loop is flawed.
int count=1;//Count is being set to one
while(RS.next()) {
int i = 1;//i is being set to one
count=1;//count again set to one
while(i < count) //condition will always fail as one is never less than one
{
RSList.add(RS.getString(i++));//Code is never Reached
}
System.out.println(RS.getString("SIEBEL_NUMBER"));
RSList.add( RS.getString("SIEBEL_NUMBER"));
}
The second while is not needed. Just use this:
int count = 1;
while(RS.next()) {
RSList.add(RS.getString(count++));
System.out.println(RS.getString("SIEBEL_NUMBER"));
RSList.add( RS.getString("SIEBEL_NUMBER"));
}
EDIT
int count1=1;
while(SR.next()) {
SRList.add(SR.getString(count1++));
System.out.println(SR.getString("SIEBEL_NO"));
SRList.add( SR.getString("SIEBEL_NO"));
}
EDIT 2:
for (String s : RSList)
for(String s1 : SRList)
if (s.equals(s1))
//Do what you need
You are using the first resultset (RS) in the second loop (System.out.println line)