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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.iciql;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.StringTokenizer;
import com.iciql.util.JdbcUtils;
/**
* This class represents a parameterized SQL statement.
*/
public class SQLStatement {
private Db db;
private StringBuilder buff = new StringBuilder();
private String sql;
private ArrayList<Object> params = new ArrayList<Object>();
SQLStatement(Db db) {
this.db = db;
}
public void setSQL(String sql) {
this.sql = sql;
buff = new StringBuilder(sql);
}
public SQLStatement appendSQL(String s) {
buff.append(s);
sql = null;
return this;
}
public SQLStatement appendTable(String schema, String table) {
return appendSQL(db.getDialect().prepareTableName(schema, table));
}
public SQLStatement appendColumn(String column) {
return appendSQL(db.getDialect().prepareColumnName(column));
}
/**
* getSQL returns a simple string representation of the parameterized
* statement which will be used later, internally, with prepareStatement.
*
* @return a simple sql statement
*/
String getSQL() {
if (sql == null) {
sql = buff.toString();
}
return sql;
}
/**
* toSQL creates a static sql statement with the referenced parameters
* encoded in the statement.
*
* @return a complete sql statement
*/
String toSQL() {
if (sql == null) {
sql = buff.toString();
}
if (params.size() == 0) {
return sql;
}
StringBuilder sb = new StringBuilder();
// TODO this needs to me more sophisticated
StringTokenizer st = new StringTokenizer(sql, "?", false);
int i = 0;
while (st.hasMoreTokens()) {
sb.append(st.nextToken());
if (i < params.size()) {
Object o = params.get(i);
if (RuntimeParameter.PARAMETER == o) {
// dynamic parameter
sb.append('?');
} else {
// static parameter
sb.append(db.getDialect().prepareStringParameter(o));
}
i++;
}
}
return sb.toString();
}
public SQLStatement addParameter(Object o) {
// Automatically convert java.util.Date to java.sql.Timestamp
// if the dialect requires java.sql.Timestamp objects (e.g. Derby)
if (o != null && o.getClass().equals(java.util.Date.class)
&& db.getDialect().getDateTimeClass().equals(java.sql.Timestamp.class)) {
o = new java.sql.Timestamp(((java.util.Date) o).getTime());
}
params.add(o);
return this;
}
void execute() {
PreparedStatement ps = null;
try {
ps = prepare(false);
ps.execute();
} catch (SQLException e) {
throw IciqlException.fromSQL(getSQL(), e);
} finally {
JdbcUtils.closeSilently(ps);
}
}
ResultSet executeQuery() {
try {
return prepare(false).executeQuery();
} catch (SQLException e) {
throw IciqlException.fromSQL(getSQL(), e);
}
}
int executeUpdate() {
PreparedStatement ps = null;
try {
ps = prepare(false);
return ps.executeUpdate();
} catch (SQLException e) {
throw IciqlException.fromSQL(getSQL(), e);
} finally {
JdbcUtils.closeSilently(ps);
}
}
long executeInsert() {
PreparedStatement ps = null;
try {
ps = prepare(true);
ps.executeUpdate();
long identity = -1;
ResultSet rs = ps.getGeneratedKeys();
if (rs != null && rs.next()) {
identity = rs.getLong(1);
}
JdbcUtils.closeSilently(rs);
return identity;
} catch (SQLException e) {
throw IciqlException.fromSQL(getSQL(), e);
} finally {
JdbcUtils.closeSilently(ps);
}
}
private void setValue(PreparedStatement prep, int parameterIndex, Object x) {
try {
prep.setObject(parameterIndex, x);
} catch (SQLException e) {
IciqlException ix = new IciqlException(e, "error setting parameter {0} as {1}", parameterIndex, x
.getClass().getSimpleName());
ix.setSQL(getSQL());
throw ix;
}
}
PreparedStatement prepare(boolean returnGeneratedKeys) {
PreparedStatement prep = db.prepare(getSQL(), returnGeneratedKeys);
for (int i = 0; i < params.size(); i++) {
Object o = params.get(i);
setValue(prep, i + 1, o);
}
return prep;
}
}
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