Example usage for java.sql ParameterMetaData parameterNoNulls

Introduction

In this page you can find the example usage for java.sql ParameterMetaData parameterNoNulls.

Prototype

int parameterNoNulls

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Document

The constant indicating that a parameter will not allow NULL values.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getHSQLConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("create table survey (id int,name varchar);");
    st.executeUpdate("create view surveyView as (select * from survey);");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    PreparedStatement pstmt = null;
    ParameterMetaData paramMetaData = null;
    String query = "select * from survey where id > ? and name = ?";
    pstmt = conn.prepareStatement(query);
    paramMetaData = pstmt.getParameterMetaData();
    if (paramMetaData == null) {
        System.out.println("db vendor does NOT support ParameterMetaData");
    } else {/* w  ww . j  a v a  2  s .c  o  m*/
        System.out.println("db vendor supports ParameterMetaData");
        // find out the number of dynamic parameters
        int paramCount = paramMetaData.getParameterCount();
        System.out.println("paramCount=" + paramCount);
        System.out.println("-------------------");
        for (int param = 1; param <= paramCount; param++) {
            System.out.println("param number=" + param);
            int nullable = paramMetaData.isNullable(param);
            if (nullable == ParameterMetaData.parameterNoNulls) {
                System.out.println("parameter will not allow NULL values.");
            } else if (nullable == ParameterMetaData.parameterNullable) {
                System.out.println("parameter will allow NULL values.");
            } else {
                System.out.println("nullability of a parameter is unknown.");
            }
        }
    }

    pstmt.close();
    conn.close();

}

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