PreparedStatement with list of parameters in a IN clause [duplicate]

Answer 1

You can use :

for( int i = 0 ; i < listField.size(); i++ ) {
    i < listField.size() - 1 ? request.append("?,") : request.append("?");
}

Then :

int i = 1;
for (String field : listField) {
    statement.setString(i++, field);
}

Exemple :

List<String> listField = new ArrayList<String>();
listField.add("test1");
listField.add("test2");
listField.add("test3");

StringBuilder request = new StringBuilder("SELECT * FROM TABLE WHERE FIELD IN (");

for( int i = 0 ; i < listField.size(); i++ ) {
    request = i < (listField.size() - 1) ? request.append("?,") : request.append("?");
}


DNAPreparedStatement statement = DNAPreparedStatement.newInstance(connection, request.toString);

int i = 1;
for (String field : listField) {
    statement.setString(i++, field);
}

ResultSet rs = statement.executeQuery();

Answer 2

public static void main(String arg[]) {

    Connection connection = ConnectionManager.getConnection(); 
    PreparedStatement pstmt = null;
          //if the field values are in ArrayList
        List<String> fieldList = new ArrayList();

    try {

        StringBuffer sb = new StringBuffer();  

        sb.append("  SELECT *            \n");
        sb.append("   FROM TEST          \n");
        sb.append("  WHERE FIELD IN (    \n");

        for(int i = 0; i < fieldList.size(); i++) {
            if(i == 0) {
                sb.append("    '"+fieldList.get(i)+"'   \n");
            } else {
                sb.append("   ,'"+fieldList.get(i)+"'   \n");
            }
        }
        sb.append("             )     \n");

        pstmt = connection.prepareStatement(sb.toString());
        pstmt.executeQuery();

    } catch (SQLException se) {
        se.printStackTrace();
    }

}

Answer 3

Many DBs have a concept of a temporary table, even assuming you don't have a temporary table you can always generate one with a unique name and drop it when you are done. While the overhead of creating and dropping a table is large, this may be reasonable for very large operations, or in cases where you are using the database as a local file or in memory (SQLite).

An example from something I am in the middle of (using Java/SqlLite):

String tmptable = "tmp" + UUID.randomUUID();

sql = "create table " + tmptable + "(pagelist text not null)";
cnn.createStatement().execute(sql);

cnn.setAutoCommit(false);
stmt = cnn.prepareStatement("insert into "+tmptable+" values(?);");
for(Object o : rmList){
    Path path = (Path)o;
    stmt.setString(1, path.toString());
    stmt.execute();
}
cnn.commit();
cnn.setAutoCommit(true);

stmt = cnn.prepareStatement(sql);
stmt.execute("delete from filelist where path + page in (select * from "+tmptable+");");
stmt.execute("drop table "+tmptable+");");

Note that the fields used by my table are created dynamically.

This would be even more efficient if you are able to reuse the table.

Answer 4

You can't replace ? in your query with an arbitrary number of values. Each ? is a placeholder for a single value only. To support an arbitrary number of values, you'll have to dynamically build a string containing ?, ?, ?, ... , ? with the number of question marks being the same as the number of values you want in your in clause.

Answer 5

You need jdbc4 then you can use setArray!

In my case it didn't worked, as the UUID Datatype in postgres seems to still have its weak spots, but for the usual types it works.

ps.setArray(1, connection.createArrayOf("$VALUETYPE",myValuesAsArray));

Of course replace $VALUETYPE and myValuesAsArray with the correct values.

Remark following Marks comment:

Your database and the driver needs to support this! I tried Postgres 9.4 but I think this has been introduced earlier. You need a jdbc 4 driver, otherwise setArray won't be available. I used the postgresql 9.4-1201-jdbc41 driver that ships with spring boot

Answer 6

public class Test1 {
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("helow");
String where="where task in ";
        where+="(";
    //  where+="'task1'";
        int num[]={1,2,3,4};
        for (int i=0;i<num.length+1;i++) {
            if(i==1){
                where +="'"+i+"'";
            }
            if(i>1 && i<num.length)
                where+=", '"+i+"'";
            if(i==num.length){
                System.out.println("This is last number"+i);
            where+=", '"+i+"')";
            }
        }
        System.out.println(where);  
    }
}