如何使Hibernate使用setFixedCHAR而不是setString
我是否可以修改Hibernate将参数绑定到查询的方式 例如,我希望hibernate在字符串列上执行时使用如何使Hibernate使用setFixedCHAR而不是setString,string,hibernate,spring-data-jpa,parameterbinding,String,Hibernate,Spring Data Jpa,Parameterbinding,我是否可以修改Hibernate将参数绑定到查询的方式 例如,我希望hibernate在字符串列上执行时使用OracleResultSet.setFixedChar(),而不是在通过Spring数据执行JPA查询时使用rs.setString() 如果没有Hibernate,我会这样做: try(PreparedStatement ps = con.executeQuery("...")) { if(ps.isWrapped(OraclePreparedStatement.class) {
OracleResultSet.setFixedChar()
,而不是在通过Spring数据执行JPA查询时使用rs.setString()
如果没有Hibernate,我会这样做:
try(PreparedStatement ps = con.executeQuery("...")) {
if(ps.isWrapped(OraclePreparedStatement.class) {
ps.unwrap(OraclePreparedStatement.class).setFixedCHAR(0, myStringField);
} else {
ps.setString(0, myStringField);
}
try(ResultSet rs = ps.getResultSet()) {
while(rs.next()) {
... do stuff ...
}
}
}
存储库方法(Spring数据JPA):
List findByMyStringField(字符串myStringField);
如何影响Hibernate绑定变量的方式。在上述示例中,始终使用setString
背景:问题是我们所有的遗留数据库都使用
CHAR
列,而不是VARCHAR2
,因此我们必须处理空白,并且setFixedCHAR
应该完全按照我们的要求来做。通过实现SqlTypeDescriptor和自定义方言找到了解决方案:
@Autowired
private DataSource source;
@Bean
public HibernateJpaVendorAdapter getHibernateJPAVendorAdapter() {
return new CustomHibernateJpaVendorAdaptor();
}
private static class CustomHibernateJpaVendorAdaptor extends HibernateJpaVendorAdapter {
@Override
protected Class<?> determineDatabaseDialectClass(Database database) {
// if HSQL is copied from Spring Sourcecode to keep everything the same
if (Database.HSQL.equals(database)) {
return CustomHsqlDialect.class;
}
try {
if (source.isWrapperFor(OracleDataSource.class)) {
return CustomOracleDialect.class;
}
} catch (SQLException e) {
}
return super.determineDatabaseDialectClass(database);
}
private class CustomHsqlDialect extends HSQLDialect {
public CustomHsqlDialect() {
registerColumnType(Types.BOOLEAN, "boolean");
registerHibernateType(Types.BOOLEAN, "boolean");
}
}
}
@NoArgsConstructor
public static class CustomOracleDialect extends Oracle12cDialect {
private static final OracleCharFix INSTANCE = new OracleCharFix();
@Override
protected SqlTypeDescriptor getSqlTypeDescriptorOverride(final int sqlCode) {
switch (sqlCode) {
case Types.VARCHAR:
return INSTANCE;
default:
return super.getSqlTypeDescriptorOverride(sqlCode);
}
}
}
@Slf4j
private static class OracleCharFix extends CharTypeDescriptor {
@Override
public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
return new BasicBinder<>(javaTypeDescriptor, this) {
@Override
protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options)
throws SQLException {
if (st.isWrapperFor(OraclePreparedStatement.class)) {
OraclePreparedStatement ops = st.unwrap(OraclePreparedStatement.class);
if (ops.getParameterMetaData().getParameterType(index) == Types.CHAR) {
ops.setFixedCHAR(index, javaTypeDescriptor.unwrap(value, String.class, options));
} else {
st.setString(index, javaTypeDescriptor.unwrap(value, String.class, options));
}
} else {
st.setString(index, javaTypeDescriptor.unwrap(value, String.class, options));
}
}
@Override
protected void doBind(CallableStatement st, X value, String name, WrapperOptions options)
throws SQLException {
//Is nolonger used by Hibernate in the current Version
st.setString(name, javaTypeDescriptor.unwrap(value, String.class, options));
}
private boolean checkIfCHARByName(ResultSetMetaData metadata, String name)
throws SQLException {
for (int i = 1; i <= metadata.getColumnCount(); i++) {
if (metadata.getColumnType(i) == Types.CHAR && Objects.equals(metadata.getColumnName(i), name)) {
return true;
}
}
return false;
}
};
}
@Autowired
私有数据源;
@豆子
公共hibernatejbavendorapter gethibernatejbavendorapter(){
返回新的CustomHibernateJavaEndoraptor();
}
私有静态类CustomHibernateJavaEndoRadaptor扩展了HibernateJavaEndoRadapter{
@凌驾
已确定的受保护类DatabaseDiagnolClass(数据库){
//如果HSQL是从Spring源代码复制的,则保持一切不变
if(Database.HSQL.equals(Database)){
返回customhsqldialine.class;
}
试一试{
if(source.isWrapperFor(OracleDataSource.class)){
返回CustomOracleDialogue.class;
}
}捕获(SQLE异常){
}
返回super.determinedatabasediallationclass(数据库);
}
私有类customHSQLdialent扩展了HSQLdialent{
公共customhsqldialine(){
registerColumnType(Types.BOOLEAN,“BOOLEAN”);
registerHibernateType(Types.BOOLEAN,“BOOLEAN”);
}
}
}
@诺尔格构装师
公共静态类CustomOracleDialogue扩展了Oracle12cDialect{
私有静态最终OracleCharFix实例=新OracleCharFix();
@凌驾
受保护的SqlTypeDescriptor getSqlTypeDescriptorOverride(最终int-sqlCode){
开关(sqlCode){
case Types.VARCHAR:
返回实例;
违约:
返回super.getsqltypedescriptorverride(sqlCode);
}
}
}
@Slf4j
私有静态类OracleCharFix扩展了CharTypeDescriptor{
@凌驾
public ValueBinder getBinder(最终JavaTypeDescriptor JavaTypeDescriptor){
返回新的BasicBinder(javaTypeDescriptor,this){
@凌驾
受保护的void doBind(PreparedStatement st、X值、int索引、包装器选项)
抛出SQLException{
if(st.isWrapperFor(OraclePreparedStatement.class)){
OraclePreparedStatement ops=st.unwrap(OraclePreparedStatement.class);
if(ops.getParameterMetaData().getParameterType(index)=Types.CHAR){
setFixedCHAR(索引,javaTypeDescriptor.unwrap(值,String.class,选项));
}否则{
st.setString(索引,javaTypeDescriptor.unwrap(值,String.class,选项));
}
}否则{
st.setString(索引,javaTypeDescriptor.unwrap(值,String.class,选项));
}
}
@凌驾
受保护的void doBind(CallableStatement st、X值、字符串名称、包装器选项)
抛出SQLException{
//Hibernate在当前版本中不再使用
st.setString(名称,javaTypeDescriptor.unwrap(值,String.class,选项));
}
私有布尔checkIfCHARByName(ResultSetMetaData元数据,字符串名称)
抛出SQLException{
对于(int i=1;i)代码在哪里?抱歉,添加了一些代码和说明
@Autowired
private DataSource source;
@Bean
public HibernateJpaVendorAdapter getHibernateJPAVendorAdapter() {
return new CustomHibernateJpaVendorAdaptor();
}
private static class CustomHibernateJpaVendorAdaptor extends HibernateJpaVendorAdapter {
@Override
protected Class<?> determineDatabaseDialectClass(Database database) {
// if HSQL is copied from Spring Sourcecode to keep everything the same
if (Database.HSQL.equals(database)) {
return CustomHsqlDialect.class;
}
try {
if (source.isWrapperFor(OracleDataSource.class)) {
return CustomOracleDialect.class;
}
} catch (SQLException e) {
}
return super.determineDatabaseDialectClass(database);
}
private class CustomHsqlDialect extends HSQLDialect {
public CustomHsqlDialect() {
registerColumnType(Types.BOOLEAN, "boolean");
registerHibernateType(Types.BOOLEAN, "boolean");
}
}
}
@NoArgsConstructor
public static class CustomOracleDialect extends Oracle12cDialect {
private static final OracleCharFix INSTANCE = new OracleCharFix();
@Override
protected SqlTypeDescriptor getSqlTypeDescriptorOverride(final int sqlCode) {
switch (sqlCode) {
case Types.VARCHAR:
return INSTANCE;
default:
return super.getSqlTypeDescriptorOverride(sqlCode);
}
}
}
@Slf4j
private static class OracleCharFix extends CharTypeDescriptor {
@Override
public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
return new BasicBinder<>(javaTypeDescriptor, this) {
@Override
protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options)
throws SQLException {
if (st.isWrapperFor(OraclePreparedStatement.class)) {
OraclePreparedStatement ops = st.unwrap(OraclePreparedStatement.class);
if (ops.getParameterMetaData().getParameterType(index) == Types.CHAR) {
ops.setFixedCHAR(index, javaTypeDescriptor.unwrap(value, String.class, options));
} else {
st.setString(index, javaTypeDescriptor.unwrap(value, String.class, options));
}
} else {
st.setString(index, javaTypeDescriptor.unwrap(value, String.class, options));
}
}
@Override
protected void doBind(CallableStatement st, X value, String name, WrapperOptions options)
throws SQLException {
//Is nolonger used by Hibernate in the current Version
st.setString(name, javaTypeDescriptor.unwrap(value, String.class, options));
}
private boolean checkIfCHARByName(ResultSetMetaData metadata, String name)
throws SQLException {
for (int i = 1; i <= metadata.getColumnCount(); i++) {
if (metadata.getColumnType(i) == Types.CHAR && Objects.equals(metadata.getColumnName(i), name)) {
return true;
}
}
return false;
}
};
}