Replaces java.sql.Types constants with java.sql.SQLType values.

java.sql.Types constants are int values and therefore make it tedious to read and debug the code.
SQLType values are mostly enum constants which are much nicer to use.

Original pull request #1142

Author: schauder

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/BasicJdbcConverter.java

@@ -19,6 +19,7 @@
 import java.sql.JDBCType;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.sql.SQLType;
 import java.util.Map;
 import java.util.Optional;
 
@@ -163,10 +164,15 @@ private Class<?> getReferenceColumnType(RelationalPersistentProperty property) {
 	}
 
 	@Override
+	public SQLType getTargetSqlType(RelationalPersistentProperty property) {
+		return JdbcUtil.targetSqlTypeFor(getColumnType(property));
+	}
+
+	@Override
+	@Deprecated
 	public int getSqlType(RelationalPersistentProperty property) {
 		return JdbcUtil.sqlTypeFor(getColumnType(property));
 	}
-
 	@Override
 	public Class<?> getColumnType(RelationalPersistentProperty property) {
 		return doGetColumnType(property);
@@ -256,7 +262,18 @@ private boolean canWriteAsJdbcValue(@Nullable Object value) {
 	}
 
 	@Override
+	@Deprecated
 	public JdbcValue writeJdbcValue(@Nullable Object value, Class<?> columnType, int sqlType) {
+		return writeJdbcValue(value, columnType, JdbcUtil.jdbcTypeFor(sqlType));
+	}
+
+
+		/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.jdbc.core.convert.JdbcConverter#writeValue(java.lang.Object, java.lang.Class, int)
+	 */
+	@Override
+	public JdbcValue writeJdbcValue(@Nullable Object value, Class<?> columnType, SQLType sqlType) {
 
 		JdbcValue jdbcValue = tryToConvertToJdbcValue(value);
 		if (jdbcValue != null) {
@@ -266,7 +283,8 @@ public JdbcValue writeJdbcValue(@Nullable Object value, Class<?> columnType, int
 		Object convertedValue = writeValue(value, ClassTypeInformation.from(columnType));
 
 		if (convertedValue == null || !convertedValue.getClass().isArray()) {
-			return JdbcValue.of(convertedValue, JdbcUtil.jdbcTypeFor(sqlType));
+
+			return JdbcValue.of(convertedValue, sqlType);
 		}
 
 		Class<?> componentType = convertedValue.getClass().getComponentType();

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/DefaultDataAccessStrategy.java

@@ -17,8 +17,8 @@
 
 import static org.springframework.data.jdbc.core.convert.SqlGenerator.*;
 
-import java.sql.JDBCType;
 import java.sql.ResultSet;
+import java.sql.SQLType;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
@@ -474,17 +474,17 @@ private IdentifierProcessing getIdentifierProcessing() {
 	private void addConvertedPropertyValue(SqlIdentifierParameterSource parameterSource,
 			RelationalPersistentProperty property, @Nullable Object value, SqlIdentifier name) {
 
-		addConvertedValue(parameterSource, value, name, converter.getColumnType(property), converter.getSqlType(property));
+		addConvertedValue(parameterSource, value, name, converter.getColumnType(property), converter.getTargetSqlType(property));
 	}
 
 	private void addConvertedPropertyValue(SqlIdentifierParameterSource parameterSource, SqlIdentifier name, Object value,
 			Class<?> javaType) {
 
-		addConvertedValue(parameterSource, value, name, javaType, JdbcUtil.sqlTypeFor(javaType));
+		addConvertedValue(parameterSource, value, name, javaType, JdbcUtil.targetSqlTypeFor(javaType));
 	}
 
 	private void addConvertedValue(SqlIdentifierParameterSource parameterSource, @Nullable Object value,
-			SqlIdentifier paramName, Class<?> javaType, int sqlType) {
+								   SqlIdentifier paramName, Class<?> javaType, SQLType sqlType) {
 
 		JdbcValue jdbcValue = converter.writeJdbcValue( //
 				value, //
@@ -495,7 +495,7 @@ private void addConvertedValue(SqlIdentifierParameterSource parameterSource, @Nu
 		parameterSource.addValue( //
 				paramName, //
 				jdbcValue.getValue(), //
-				JdbcUtil.sqlTypeFor(jdbcValue.getJdbcType()));
+				jdbcValue.getJdbcType().getVendorTypeNumber());
 	}
 
 	private void addConvertedPropertyValuesAsList(SqlIdentifierParameterSource parameterSource,
@@ -506,15 +506,15 @@ private void addConvertedPropertyValuesAsList(SqlIdentifierParameterSource param
 		for (Object id : values) {
 
 			Class<?> columnType = converter.getColumnType(property);
-			int sqlType = converter.getSqlType(property);
+			SQLType sqlType = converter.getTargetSqlType(property);
 
 			jdbcValue = converter.writeJdbcValue(id, columnType, sqlType);
 			convertedIds.add(jdbcValue.getValue());
 		}
 
 		Assert.state(jdbcValue != null, "JdbcValue must be not null at this point. Please report this as a bug.");
 
-		JDBCType jdbcType = jdbcValue.getJdbcType();
+		SQLType jdbcType = jdbcValue.getJdbcType();
 		int typeNumber = jdbcType == null ? JdbcUtils.TYPE_UNKNOWN : jdbcType.getVendorTypeNumber();
 
 		parameterSource.addValue(paramName, convertedIds, typeNumber);

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/DefaultJdbcTypeFactory.java

@@ -16,7 +16,7 @@
 package org.springframework.data.jdbc.core.convert;
 
 import java.sql.Array;
-import java.sql.JDBCType;
+import java.sql.SQLType;
 
 import org.springframework.data.jdbc.support.JdbcUtil;
 import org.springframework.jdbc.core.ConnectionCallback;
@@ -67,7 +67,7 @@ public Array createArray(Object[] value) {
 
 		Class<?> componentType = arrayColumns.getArrayType(value.getClass());
 
-		JDBCType jdbcType = JdbcUtil.jdbcTypeFor(componentType);
+		SQLType jdbcType = JdbcUtil.targetSqlTypeFor(componentType);
 		Assert.notNull(jdbcType, () -> String.format("Couldn't determine JDBCType for %s", componentType));
 		String typeName = arrayColumns.getArrayTypeName(jdbcType);
 

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/JdbcConverter.java

@@ -16,6 +16,7 @@
 package org.springframework.data.jdbc.core.convert;
 
 import java.sql.ResultSet;
+import java.sql.SQLType;
 
 import org.springframework.data.jdbc.core.mapping.JdbcValue;
 import org.springframework.data.relational.core.conversion.RelationalConverter;
@@ -39,12 +40,24 @@ public interface JdbcConverter extends RelationalConverter {
 	 * to JDBC parameters.
 	 *
 	 * @param value a value as it is used in the object model. May be {@code null}.
-	 * @param type {@link TypeInformation} into which the value is to be converted. Must not be {@code null}.
+	 * @param type {@literal Class} into which the value is to be converted. Must not be {@code null}.
 	 * @param sqlType the type constant from {@link java.sql.Types} to be used if non is specified by a converter.
 	 * @return The converted value wrapped in a {@link JdbcValue}. Guaranteed to be not {@literal null}.
 	 */
 	JdbcValue writeJdbcValue(@Nullable Object value, Class<?> type, int sqlType);
 
+	/**
+	 * Convert a property value into a {@link JdbcValue} that contains the converted value and information how to bind it
+	 * to JDBC parameters.
+	 *
+	 * @param value a value as it is used in the object model. May be {@code null}.
+	 * @param type {@literal Class} into which the value is to be converted. Must not be {@code null}.
+	 * @param sqlType the {@link SQLType} to be used if non is specified by a converter.
+	 * @return The converted value wrapped in a {@link JdbcValue}. Guaranteed to be not {@literal null}.
+	 * @since 2.4
+	 */
+	JdbcValue writeJdbcValue(@Nullable Object value, Class<?> type, SQLType sqlType);
+
 	/**
 	 * Read the current row from {@link ResultSet} to an {@link RelationalPersistentEntity#getType() entity}.
 	 *
@@ -73,7 +86,7 @@ public interface JdbcConverter extends RelationalConverter {
 	 * top-level array type (e.g. {@code String[][]} returns {@code String[]}).
 	 *
 	 * @return a {@link Class} that is suitable for usage with JDBC drivers.
-	 * @see org.springframework.data.jdbc.support.JdbcUtil#sqlTypeFor(Class)
+	 * @see org.springframework.data.jdbc.support.JdbcUtil#targetSqlTypeFor(Class)
 	 * @since 2.0
 	 */
 	Class<?> getColumnType(RelationalPersistentProperty property);
@@ -85,5 +98,9 @@ public interface JdbcConverter extends RelationalConverter {
 	 * @see java.sql.Types
 	 * @since 2.0
 	 */
+	SQLType getTargetSqlType(RelationalPersistentProperty property);
+
+	@Deprecated
 	int getSqlType(RelationalPersistentProperty property);
+
 }

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/mapping/JdbcValue.java

@@ -16,6 +16,7 @@
 package org.springframework.data.jdbc.core.mapping;
 
 import java.sql.JDBCType;
+import java.sql.SQLType;
 import java.util.Objects;
 
 import org.springframework.lang.Nullable;
@@ -31,15 +32,15 @@
 public class JdbcValue {
 
 	private final Object value;
-	private final JDBCType jdbcType;
+	private final SQLType jdbcType;
 
-	protected JdbcValue(@Nullable Object value, @Nullable JDBCType jdbcType) {
+	protected JdbcValue(@Nullable Object value, @Nullable SQLType jdbcType) {
 
 		this.value = value;
 		this.jdbcType = jdbcType;
 	}
 
-	public static JdbcValue of(@Nullable Object value, @Nullable JDBCType jdbcType) {
+	public static JdbcValue of(@Nullable Object value, @Nullable SQLType jdbcType) {
 		return new JdbcValue(value, jdbcType);
 	}
 
@@ -49,7 +50,7 @@ public Object getValue() {
 	}
 
 	@Nullable
-	public JDBCType getJdbcType() {
+	public SQLType getJdbcType() {
 		return this.jdbcType;
 	}